Accession Number : AD0677250

Title :   STUDIES OF TRIVALENT RARE-EARTH OXIDE-BERYLLIUM OXIDE SYSTEMS,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Han Weng-Loong, ; Kuo Tso-Kung,

Report Date : 25 OCT 1967

Pagination or Media Count : 6

Abstract : Experiments were conducted on products of reactions between trivalent rare earth oxides and beryllium oxides and on the equilibrium of the Gd2O3-BeO system. Phase diagrams of the Gd2O3-BeO system were plotted based on the analytic results obtained by three methods, viz., quenching, polarizing microscope, and x-ray diffraction. A new biaxial crystalline phase (n sub p = 1.89, n sub g = 1.94, angle between axes = 90 deg.) was found having parameters a = 3.603 plus or minus 0.003 A, b = 9.85 plus or minus 0.03 A c = 10.51 plus or minus 0.02 A. The new crystalline phase shows a diffraction pattern similar to that of yttrium oxide when being decomposed at 1460C. Chemical composition of the new phase was determined to be Gd2O3.2BeO. (Author)

Descriptors :   (*RARE EARTH ELEMENTS, *PHASE DIAGRAMS), (*BERYLLIUM OXIDES, PHASE DIAGRAMS), QUENCHING, POLARIZATION, X RAY DIFFRACTION, CHINA

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE