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Investigador por México, SECIHTI (2024 - 2034) 
Department of Physics of Materials
Edificio de Investigación
Centro de Investigación en Materiales Avanzados (CIMAV) S. C.
unidad Chihuahua

                     

            Positions
            Catédra CONAHCYT, CIMAV-Chihuahua (2014-2024)

            SNII level II, Area 1, SECIHTI (2024 - 2028)

Lecturer, PhysicsENP P7, UNAM 2013-2014

Post-Doctoral Research Fellow, Universitat de València     2012-2013

Post-Doctoral Research Fellow, Universitat de València     2010-2011

Adjunct Lecturer, Facultad de Ciencias, UNAM 2006-2007

Adjunct Lecturer, IIM, UNAM 2006-2007

Lecturer Physics College,ENP P8, UNAM 2001-2004
            Teaching Assistant, Facultad de Ciencias, UNAM 1997-2001

               
                                                  Research Experience

Researcher in nano-multiferroic materials (2014 - 2024)
CIMAV-Chihuahua

Post-Doctoral Research Fellow 

Unit of Ceramic Materials and Glasses 

Department of Inorganic Chemistry,

Universitat de Valencia (campus Burjasot), Spain

Project: "A protected annealing process for the production of Pr and Fe-containing ZrSiO4 (and ZrO2) solid solutions prepared by the control hydrolysis and colloidal gel routes."

2nd year January 2012 – January 2013 

1st year April 2010 – April 2011 

Advisor: Prof. Dr. Javier Alarcón Navarro, PhD 

e-mail: javier.alarcon@uv.es

                                                   Academic Experience

Ph. D.  (Chemistry)

Departamento de Interacción de Radiación con Materia

Instituto de Ciencias Nucleares, UNAM, Mexico
Posgrado en Ciencias Químicas

2005 – 2008 

Thesis: “Raman scattering study by soft X-rays of the electronic structure in vanadium compounds.”

date of graduation 9/06/2009

Advisor: Prof. Dr. José I. Jiménez Mier y Terán, PhD

e-mail: jimenez@nucleares.unam.mx



M. Sc. (Science and Engineering of Materials)

Department of Metallic and Ceramic Materials

Instituto de Investigaciones en Materiales, UNAM, México

2001-2004

Thesis: “Magneto-dynamic Properties of doped Ni-Zn ferrites”

date of graduation 18/03/2005

Advisor: Dr. Ma. I. Rosales Vázquez, PhD

B. Sc. (Physics) 

School of Sciences, UNAM, México

1993-1998

Observational Astronomy Department

Instituto de Astronomía, UNAM, Mexico

1999-2000

Thesis: ”CCD Fotometry of Globular Cluster M15” 

date of graduation 11/07/2001

Advisor: Prof. Dr. Roberto Alejandro Ruelas Mayorga, PhD        

e-mail: rarm@astroscu.unam.mx

Undergraduate Researcher

Sismology Department
Intituto de Geofísica, UNAM, Mexico
March 10^th - September 9^th 1997

Proyect: “Study of Mexico´s Lg Phase."

Advisor: Prof. Dr. Jaime Yamamoto Victorio, PhD
e-mail: yamas@geofisica.unam.mx

co-Advisor: Prof. Dr. Luis Quintanar Robles, PhD
e-mail:luisq@ollin.geofisica.unam.mx

                                                     

                                                        Meetings 2016

May

[1] "Comparison between milling processes to improve dielectric/ferroelectric/piezoelectric properties in BCZT"

Guillermo Herrera-Pérez, Kevin Jiménez, Armando Reyes-Montero Armando Reyes-Rojas,

Maria E. Villafuerte-Castrejón, Oscar Solis and Luis E. Fuentes-Cobas

International Conference on Ceramic Processing Science (ICCPS-13)

ICCPS-13

May 8th-11th Orlando Florida USA

https://unit.aist.go.jp/ifmri/iccps13/

July

[2] "Low loss Electron Energy Spectroscopy Characterization of Electronic Structure and Piezo-response of Ba0.9Ca0.1Ti0.9Zr0.1O3 Nanocrystals".

G. Herrera-Pérez, D. Morales C., F. Paraguay-Delgado, A. Hurtado-Macias, R. Borja Urby, A. Reyes-Rojas, L. E. Fuentes-Cobas

July 24-28, 2016 at the Columbus Convention Center in Columbus, Ohio.

MM2016ProgramChair@microscopy.org

Awards & Funding

                                                              Awards & Acknowledgements


SNI Fellowship      Member of Mexican National Science and 
No. 56476                Technology Council (SNI I). 

                                     Field 1: Physics, Mathematics and Earth Sciences.
                                     Since January 2013


  

                                
 RCEA Fellowship               Member of the CONACYT Registry of Accredited 
 No. -01-25190-2013          Evaluators (RCEA) 
                                                  Member of the Iberoamerican Evaluators for the 
                                                  evaluation projects
                                       
                                                   Field 1: Physics, Mathematics and Earth Sciences.
                                                   Since February 2013

            Post-Doctoral Research Awarded             Second year: CONACyT Grant       No. 172529

            First year: CONACyT Grant            No. 129569

     

Brazilian Awarded Travel Bursaries        6^th International Conference on Synchrotron    Radiation in Materials Science

                                                                                    July 20^th-23^th, 2008, Campinas, Brazil

Ph. D.                                                            CONACyT Grant      No. 170588

ACS Awarded Travel Bursaries                Australian Ceramic Society

            to Students for the Materials and Austceram    

            2007

            International Conference that was held in

            July 4^th-6^th, 2007, Sydney, Australia

             Scholarship for Young Scientists             International Microscopy Congress

            International Federation of Societies for 

            Microscopy IMC16/IFSM

            supported by Hitachi High-Technologies Corp.

                                                                                   September 3^th-8^th, 2006, Sapporo, Hokkaido, 

                                                                                   Japan

 M. Sc.                                                           CONACyT Grant                 No. 170588

             DGEP y PAPPIT Grant       No. IN116903 

            Prof. Dr. Luis Fernando Magaña Solis (PhD)

            CONACyT Grant                 No. 33632U

                                                                                   Dr. María Inés Rosales Vázquez (Advisor)

                                            Funding & Acknowledgements

                                                       Memberships


American Ceramic Society             Member  No. 65960                                                          
                                                                    Since January 2011

Materials Research Society           Member  No. 258982                                                    
                                                                   Since January 2011 

Facilities

Ceramic materials laboratory  facilities are roughly divided into two categories: Processing and Characterization.


The central topic guiding research within the laboratory is implied by its name, the processing and characteristics of ceramic materials.

The following text gives a virtual tour of our facilities, highlighting the equipment and the respective applications of each.


1. Synthesis Laboratory (Sol-Gel)

CIMAV, Mexico acrylamide polimerization route; colloidal gel and hydrolisis route; Pechini method.


Thermal Analysis: Differential Thermal Analysis, Differential Scanning Calorimeter and Thermal Gravimetric Analyzer (DTA, DSC and TGA)


2. Structure: X-ray diffraction (XRD) and Rietveld method using FullProf software


3. Morphology and chemical composition: Scanning Electron Microscopy, Energy  Dispersive of X-ray and Transmission Electron Microscopy (SEM, EDX and TEM).
 Morphology analysis using Image J software.

4. Morphology Atomic Force Microscopy (AFM)

5.  Structure (Uv-vis, Raman and FT-IR spectroscopies)

6. Electronic structure and chemical composition, X-ray Photoelectron spectroscopy (XPS)

7. Magnetic properties: Vibrating Sample Magnetometer (VSM and Inductance spectroscopy)

IIM-UNAM, Mexico, Prof. Dr. I. Betancourt Reyes

Research & Teaching

My research interests involve the application of x-ray spectroscopic techniques to the investigation of the electronic structure and magnetic behaviour of ceramic materials.

The spectroscopic techniques use high-brightness synchrotron x-ray sources such as the ALS. The techniques used are soft x-ray absorption spectroscopy (XAS), soft x-ray emission spectroscopy (XES) and soft x-ray photoemission spectroscopy (XPS).

These x-ray spectroscopic techniques reveal detailed information about the conduction band structure, the valence band structure, the core-level structure of the material respectively.

Electronic relaxation processes of both pure and dope d transition metal oxide semiconductors is one of my principal research interests.

Local electronic structure was determined by synchrotron radiation based x-ray emission and x-ray absorption and resonant inelastic x-ray scattering (RIXS) spectroscopies at the L2,3 of Vanadium and Titanium in YVO4-YVO3 and LaVO4-LaVO3 compounds at the Advanced Light Source, Lawrence Berkeley National Laboratory, California, USA.

In order to obtain element specific, symmetry and state selective measurements of the occupied partial density of states or occupied molecular orbitals of these solids.

The project on electronic structure of vanadates and titanates measured by x-ray absorption and emission spectroscopy is already underway.

My other principal research interest is in the magnetic behaviour of ceramics (in particular ferrites) doped with transition metal oxides such as: Vanadium and Cobalt. More information about specific areas of research is available  via the Research link.

You can also find a complete listing of the scientific publications that I have helped to contribute to the literature.

                                                       Collaborators

These projects are carried out in collaboration with the following groups within UNAM:

• Synchrotron Radiation Group of Prof. Dr. J. Jiménez-Mier y Terán, Instituto de Ciencias Nucleares, (ICN).
• 
  
• Magnetism Group of Prof. Dr. I. Betancourt Reyes (IIM).

I also collaborate with the following international groups:

• Universitat de València, Valencia, España, Electrochemical Group of Prof. Dr. A. Domènech-Carbó.
• 
  
• Universidad Nacional de San Antonio de Cusco, Cusco, Perú, Prof. Dr. A. Zapata de Camino Head of Materials Laboratory.
• 
  
• Universidad Pontificia de Bucaramanga, Floridablanca, Colombia,  Prof. Dr. A. Remolina Millán Director of Nanomaterials laboratory
• 
  
• ALS-LBNL, Beamline scientist, California, USA Soft X-ray spectroscopy Group of Prof. Dr. W.L. Yang
• 
  

                                               TEACHING EXPERIENCE

No. 803558         Professor "A"
                                School of Sciences (Facultad de Ciencias)

                                Ciudad Universitaria, UNAM, 
                                Mexico City, Mexico
                                Since January 1998

Postgraduate Courses at IIM-UNAM: 2

Advanced Mathematics for Materials 2006.

Undergraduate Courses at Facultad de Ciencias UNAM: 14

Advanced Mathematics for Physists 2006, 2007, 
Thermodynamics 1998, 2000, 2007, 
Electromagnetism 1999, 2000, 2001, 2006,
Algebra 2002, 
Mechanics 2000, 
Biophysics 1997, 1998.

High School Courses at ENP P8  and ENP P7, UNAM: 12

Physics 2001, 2002, 2003, 2004, 2013, 2014, 
Cosmology 2004 

Meetings

                                                                Research talks

[12] “Raman spectroscopy to probe structural changes of Fe-ZrSiO₄ nanocomposites”
International Multidisciplinary Joint Meeting 2014. 7º. Encuentro Internacional e Interdisciplinario en Nanocienciay Nanotecnología, (Nanomex). 11ª. Reunión Internacional de Materiales Nanoestructurados y Nanotecnología, (Nanotech). 1 ª Reunión de Estudiantes de Nanotecnología de las Universidades Tecnológicas

G. Herrera*,  J. Alarcón, N. Montoya and A. Domènech-Carbó                    

June 9th-13th, 2014 Pachuca, Hidalgo, Mexico

[11] “A protected annealing process for the production of colloidal iron doped zircon Fe-ZrSiO4”
G. Herrera, N. Montoya and J. Alarcón
4th Mexican Workshop on Nanostructured Materials.
March 19th-22th, 2013 Puebla City, Mexico

[10] “Excited states in YVO4 measured by X-ray absorption spectroscopy”
G. Herrera and J. Jiménez-Miér
Workshop on EELS in Materials Science.
June 18th-20th, 2012 Uppsala, Sweden

[9] “Electronic structure of d0 vanadates obtained by x-ray absorption and emission spectroscopies”
G. Herrera, J. Jiménez-Miér, E. Chavira, A. Moewes and R. Wilks
6th International Conference on Synchrotron Radiation in Materials Science.
July 20th-23th, 2008 Campinas, Brazil

[8] “Structural and morphology characterization of LaVO3 prepared by sol-gel acrylamide polymerization and solid state reaction methods”
G Herrera Pérez, E. Chavira, J. Jiménez Mier y Terán, A. Ordóñez, E. Fregoso, L. Baños, E. Bucio, J. Guzmán, O. Novelo, C. Flores.
Materials Research Society-Asia
June 6th-9th, 2008 Chongqing, China

[7] “Ligand field and charge transfer effects on the electronic structure of vanadium d0 and d2 compounds”
G. Herrera, J. Jiménez-Mier
27th workshop Brandt and Richi
December 17th-19th 2007 Playa del Carmen, México

[6] “Electronic Structure of YVO3 and V2O5 obtained by Resonant Absorption and Emission of X-Rays and comparison with an Atomic Multiplet Model”
G. Herrera
Materials and Austceram
July 4th-6th 2007 Sydney, Australia

[5] “Comparative Study of Nanocrystalline Growth and Grain Size Effects on the Microstructure of Lanthanum Titanate Synthesized by Solid State Reaction Method and Sol-gel Acrylamide Route”
G. Herrera, E. Chavira, J. Jiménez-Mier, L. Baños, J. Guzmán, C. Flores
16th International Microscopy Congress
September 3th-8th 2006, Sapporo, Japan

[4] “Electronic Structure of TiO2, TiF4, V2O5 and VF4 Obtained by Resonant Absorption and Emission of X-Rays and Comparisson with Atomic Multiplet Model”
G. Herrera
XIII International Materials Research Congress,
August 20th-24th, 2006, Cancún, México

[3] “Study of the resonance relaxation phenomena of Ni-Zn ferrites doped with V2O3 by high frequency impedance spectroscopy”
G. Herrera, I. Rosales, E. A. Escárcega, H. Montiel and R. Valenzuela
The Thirteeth International Conference on Processing and fabrication of Advance Materials (PFAM XIII)
December 6th- 8th, 2004, Singapore, Singapore

[2] “Ferrites doped with V2O3”
G. Herrera, I. Rosales, and J.Guzmán
XIII International Materials Research Congress,
August 22th-26th, 2004, Cancún, México

[1] “Fotometría CCD del cúmulo globular M15”
G. M. Herrera Pérez, A. Ruelas Mayorga
V Reunión Nacional de Astronomía
October 1999 Morelia Michoacán, México


                                                                Research Posters


[18] “Electronic structure of monazite-LaVO₄ and perovskite-LaVO₃ by the Absorption and Emission of X-ray”
G. Herrera, J. Jiménez-Mier, R. G. Wilks, A. Moewes, W. Yang and J. Denlinger  
Advanced light Source User Meeting 2013 Poster slam competition
 October 7th- 9th 2013 Berkeley, California, USA

[17] “X-ray absorption to determine the metal valence state of transition metal
compounds",
J. Jiménez-Mier, P. Olalde-Velasco, G. Carabalí-Sandoval, G. Herrera-Pérez, E. Chavira, W.L. Yang, J.  Denlinger
38^th International Conference on Vacuum Ultraviolet and X-ray Physics (VUVX2013)
July 12^th-19^th, 2013, Hefei, Anhui, China

[16] ”X-Ray absorption to determine the metal oxidation state of transition metal compounds”,
J. Jiménez-Mier, P. Olalde-Velasco, G. Carabalí-Sandoval, G. Herrera-Pérez, E. Chavira, W.L. Yang, J. Denlinger
AIP Conf. Proc. IX International Symposium on Radiation Physics.
April 14^th–17^th, 2013, Puebla, Puebla, México.

[15] ”Estudio de las propiedades magnéticas en frecuencia y la microestructura  de ferritas de Mn-Zn dopadas con cobalto", 
A. Zapata, G. A. Camino, G. Herrera, H. Murrieta
LIV Congreso Nacional de Física
October 10^th–14^th, 2013 Mérida, Yucatán, México.

[14] “Monoclinic perovskite – orthorhombic perovskite La2Ti2O7 to pseudo-cubic LaTiO3 phase transition and their microstructure characterization”
G. Herrera, J. Jiménez-Mier
International Multidisciplinary Joint Meeting 2013
May 13th- 17th 2013 Morelia, Michoacán, Mexico

[13] “Polymeric gels and colloidal route of the sol-gel process -alternatives to produce Fe-ZrSiO4.”
G. Herrera, N. Montoya and J. Alarcón
37th International Conference and Exposition on Advanced Ceramics and Composites
January 27th- February 3th 2013 Daytona beach, Florida, USA

[12] “Fast electron dynamics in orthovanadates measured by resonant inelastic x-ray scattering.”
G. Herrera, J. I. Jiménez-Mier y Terán
Workshop on Nanophotonics
The Abdus Salam International Centre for Theoretical Physics. 
December 3th-7th 2012 Miramare-Trieste, Italy

[11] “Preparación y caracterización de disoluciones sólidas de Fe-ZrO2”
G. Herrera, N. Montoya and J. Alarcón
QIES-12 15ª Reunión Científica Plenaria de Química Inorgánica / 9 ª
Reunión Científica Plenaria de Química de Estado Sólido.
July 1th-4th 2012 Girona-Cataluña, Spain 

[10] “Synthesis and Nano-structural Characterization of Iron-containing Zirconium Silicate Prepared by Controlled Hydrolytic via Sol-gel Route. “ 
G. M. Herrera, N. Montoya and J. Alarcón Symposium WW Multiferroic, Ferroelectric, and Functional Materials, Interfaces, and Heterostructures 
MRS Spring Meeting 2011, San Francisco USA April 25th – 29th, 2011

[9] “Preparación y caracterización de disoluciones sólidas Fe-ZrSiO4.”
G. Herrera, N. Montoya, J. María Amigó and J. Alarcón
QIES-10 14ª Reunión Científica Plenaria de Química Inorgánica / 8 ª
Reunión Científica Plenaria de Química de Estado Sólido. September 13th-15th 2010 Cartagena, Murcia, Spain

[8] Simposio Internacional “Nanomateriales y Funcionalidad.”
Universidad Politécnica de Valencia May 25th and 26th 2010 Valencia, Spain

[7] “Microstructural Comparison of La-V-O Compounds Prepared by Sol-Gel Acrylamide Polymerization and Solid State Reaction”.
G. Herrera, E. Chavira, J. Jiménez, A. Ordoñez, E. Bucio, L. Baños, J. Guzmán, E. Fregoso-Israel and O. Novelo. 
Microscopy and Microanalysis 2009 
July 26th-30th 2009 Richmond, Virginia

[6] ”Decaimiento Coster-Kronig del hueco 2p1/2 producido de manera resonante en compuestos de vanadio-V”,
J. Jiménez-Mier, G. Herrera, E. Chavira, R. Wilks y A. Moewes.
LI Congreso Nacional de Física, 
October 20^th-24^th, 2008, Zacatecas, Zacatecas, Mexico

[5] ”X-Ray Raman scattering at the vanadium L₂-edge of V₂O₅ and d⁰ vanadates”,
J. Jiménez-Mier, G. Herrera, E. Chavira, A. Moewes y R. Wilks.
21^st International Conference on X-Ray and Inner-Shell Conference (X-08).
June 22^th-27^th, 2008, Paris, France

[4] ”X-Ray Raman scattering at the vanadium L₂-edge of V₂O₅ and d⁰ vanadates”,

J. Jiménez-Mier, G. Herrera, E. Chavira, A. Moewes y R. Wilks.

International Workshop on Resonant Inelastic X-Ray Scattering (RIXS08).

June 13^th-14^th, 2008, Uppsala, Sweden

[3] “Direct Observation of S-R Bonding in Nanosized La2Ti2O7 and Y2Ti2O7 Compounds Obtained by Sol-Gel Acrylamide Polymerization”
G. Herrera Pérez, E. Chavira, J. Jiménez-Mier, A. Ordoñez, E. Bucio, L. Baños, J. Guzmán, E. Fregoso
Microscopy & Microanalysis 2007 
August 13th-15th 2007 Fort Lauderdale, Florida, USA

[2] ”Grain Size homogeneity in Metallic-oxides prepared by Sol-Gel Acrylamide Polimerization”
B. Salas-Adame, S. Rodriguez, A. Ordoñez, G. Herrera, E. Chavira
2^nd Mexican Workshop on Nanostructured Materiales. 
15^th-18^th, 2007, Puebla, Puebla, Mexico

[1] “Nanostructure Obtained by Sol-gel Acrylamide Polymerization in Y-V-O System”
G. Herrera Pérez, E. Chavira, J. Jiménez-Mier, L. Baños, J. Guzmán and C. Flores.
Microscopy & Microanalysis 2006
July 30th-August 3th, 2006 Chicago, Illinois USA

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