| 摘要 |
PROBLEM TO BE SOLVED: To provide lithium aluminum oxide having a high density of 3.50g/cm<SP>3</SP>unknown so far, thoughαphase having a density of 3.41g/cm<SP>3</SP>,βphase having a density of 2.69g/cm<SP>3</SP>andγphase having a density of 2.61g/cm<SP>3</SP>are known so far in the order of decreasing density as lithium aluminum oxide comprising light elements represented by the formula LiAlO<SB>2</SB>. SOLUTION: The high density lithium aluminum oxide is obtained by compacting low pressure phase lithium aluminum oxide powder represented by the formula LiAlO<SB>2</SB>, charging the resulting compact into a device shown by figure 1, applying an instantaneous pressurizing force of≥5 GPa by shock waves to the compact for a pressurization time of≤5 microseconds to bring the compact into a reaction, and then separating and recovering the compact. This compact is identified as a new compound having a tetragonal system crystal structure different from the structure of the starting material by an X-ray diffraction method. COPYRIGHT: (C)2004,JPO
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