Springer Online Journal Archives 1860-2000
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Abstract The compressibilities of the a- and c-axes for sodium β- and β″-aluminas were determined up to 10 GPa from the pressure dependence of powder X-ray diffraction measured at room temperature using synchrotron radiation as an X-ray source. Powders of sodium β- and β″-aluminas which were prepared from grinding synthesized single crystals were used as the specimens for X-ray diffraction. The compressibilities of β- and β″-aluminas are 1.5 ± 0.2 ×10−12 and 1.7 ± 0.2 × 10−12 Pa−1 for the a-axis and 2.9 ± 0.2x10−12 and 1.6 ± 0.2 ×10−12 Pa−1 for the c-axis, respectively. For the c-axis, the compressibility of β-alumina is larger than that of β″-alumina. This experimental fact is explained by the different stacking of oxygen layers and the different content in sodium ion between β- and β″-aluminas.
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