Faculty Directory
Thomas Mason

Professor Emeritus of Materials Science and Engineering


2220 Campus Drive
Cook Hall 2036; Office - Cook 3037
Evanston, IL 60208

Email Thomas Mason


Materials Science and Engineering

Download CV


Ph.D. Materials Science and Engineering, MIT, Cambridge, MA

B.S. Ceramic Science, Penn State, University Park, PA

Research Interests

Structure-Property Relationships in Electroceramics          

Professor Mason’s research expertise is in the field of electroceramics, including both electronically and ionically conductive materials. An overriding focus has been the role of point defects in their structure-property relationships. In the area of electronically conductive materials, his research interests involve transparent conducting oxides (TCOs). These materials boast a rare combination of optical transparency and high electronic mobility. TCOs serve as transparent electrodes in a wide range of applications, from flat panel displays to solar cells. Phase diagram studies are useful for identifying new TCOs and the doping mechanisms in existing and novel TCOs.

High ionic conductivity is required for advanced electrochemical systems, for example solid oxide fuel cells and electrolyzers (SOFCs, SOECs). One particular focus has been the application of AC impedance spectroscopy (AC-IS) in the characterization of polycrystalline ionic conductors. In the case of nano-grained ceramics, the Mason group developed the nano-grained composite model (n-GCM) as a more accurate alternative to the conventional brick layer model for the characterization of local bulk vs. grain boundary properties in nanocrystalline ionic conductors. Another significant application of AC-IS has been for the study of cement-based materials and fiber-reinforced composites

Significant Recognition

  • Fellow, ACerS
  • Fulrath-Pacific Award, ACerS, 1994
  • Schwartzwalder-PACE Award, AcerS, 1990
  • Highly Cited Scientist, ISI Web of Science

Significant Professional Service

  • Member, International Academy of Ceramics
  • Charles Deering McCormick Professor of Teaching Excellence, 2001-2004

Selected Publications

  • Mason, T.O.; Perry, N.H.; Nagaraja, A.R.; Tang, Y.; Grayson, M., “Band or Polaron: The Hole Conduction Mechanism in the p-Type Spinel Rh2ZnO4”, Journal of the American Ceramic Society, (2011)
  • QM Zhu;EM Hopper;BJ Ingram;TO Mason, “Combined Jonker and Ioffe Analysis of Oxide Conductors and Semiconductors”, Journal of the American Ceramic Society, (2011)
  • NH Perry;TC Yeh;TO Mason, “Temperature Dependence of Effective Grain Core/Single Crystal Dielectric Constants for Acceptor-Doped Oxygen Ion Conductors”, Journal of the American Ceramic Society, (2011)
  • Mason, T.O.; Perry, N.H.; Nagaraja, A.R.; Paudel, T.R.; Lany, S., “Asymmetric cation nonstoichiometry in spinels: Site occupancy in Co_ ${$2$}$ ZnO_ ${$4$}$ and Rh_ ${$2$}$ ZnO_ ${$4$}$”, Physical Review B, (2011)
  • Harvey, S.P.; Mason, T.O.; K\örber, C.; Klein, A.; Wachau, A., “Transparent Conducting Oxides for Photovoltaics: Manipulation of Fermi Level, Work Function and Energy Band Alignment”, Materials, (2010)
  • DL PROFFIT;GR BAI;DD FONG;TT FISTER;SO HRUSZKEWYCZ;MJ HIGHLAND;PM BALDO;PH FUOSS;TO MASON;JA EASTMAN, “Phase stabilization of delta-Bi2O3 nanostructures by epitaxial growth onto single crystal SrTiO3 or DyScO3 substrates”, Applied Physics Letters, (2010)
  • CA HOEL;TO MASON;JF GAILLARD;KR POEPPELMEIER, “Transparent Conducting Oxides in the ZnO-In2O3-SnO2 System”, Chemistry of Materials, (2010)
  • TO Mason, SP Harvey, KR Poeppelmeier, “Ternary and Multinary Materials: Crystal/Defect Structure?Property Relationships”, Handbook of Transparent ..., (2010)
  • NH PERRY;TO MASON, “Grain core and grain boundary electrical/dielectric properties of yttria-doped tetragonal zirconia polycrystal (TZP) nanoceramics”, Solid State Ionics, (2010)
  • SP Harvey, TO Mason, C Körber, A Klein, “Bulk defect chemistry and surface electronic behavior of Zn, Sn codoped In2O3 transparent conducting oxides”, PCCP. Physical chemistry ..., (2009)