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Phase Equilibria and Crystallography of Ceramic Oxides



Winnie K. Wong-Ng, Robert S. Roth, Terrell A. Vanderah, H F. McMurdie


Research in phase equilibria and crystallography has been a tradition in the Ceramics Division at NIST since the early thirties. In the early years, effort was concentrated in areas of Portland cement, ceramic glazes and glasses, instrument bearings and battery materials. In the past forty years, a large portion of the work was related to electronic materials, including ferroelectrics, piezoelectrics, ionic conductors, dielectrics, microwave dielectrics, and high-temperature superconductors. As a result of the phase equilibrium studies, many new compounds have been discovered. Some of these discoveries have had a significant impact on US industry. Structure determinations of these new phases have often been carried out as a joint effort among the NIST colleagues and also with outside collaborators using both single crystal and neutron and X-ray powder diffraction techniques. All phase equilibria diagrams were included in Phase Diagrams for Ceramists, which are collaborative publications between The American Ceramic Society (ACerS) and NBS/NIST. All X-ray powder diffraction patterns have been included in the Powder Diffraction File (PDF). This article gives a brief account of the history of the development of the phase equilibrium and crystallographic research of ceramic oxides in the Ceramics Division. Represented systems, particularly electronic materials, are highlighted.
Journal of Research (NIST JRES) -
106 No. 6


ceramic oxides, crystal chemistry, crystallography, electronic materials, historical development, phase equilibria


Wong-Ng, W. , Roth, R. , Vanderah, T. and McMurdie, H. (2001), Phase Equilibria and Crystallography of Ceramic Oxides, Journal of Research (NIST JRES), National Institute of Standards and Technology, Gaithersburg, MD (Accessed April 13, 2024)
Created November 1, 2001, Updated February 19, 2017