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lanthanum aluminate : ウィキペディア英語版
lanthanum aluminate

Lanthanum aluminate is an inorganic compound with the formula LaAlO3, often abbreviated as LAO. It is an optically transparent ceramic oxide with a distorted perovskite structure.
==Properties==
Crystalline LaAlO3 has a relatively high relative dielectric constant of ~25. LAO's crystal structure is a rhombohedral distorted perovskite with a pseudocubic lattice parameter of 3.787 angstroms at room temperature〔(【引用サイトリンク】url=http://www.mtixtl.com/laalo3.aspx )〕 (although one source claims the lattice parameter is 3.82〔(【引用サイトリンク】url=http://www.crystec.de/laalo3-e.html )〕). Polished single crystal LAO surfaces show twin defects visible to the naked eye. LAO's (pseudocubic) lattice constant is virtually identical to that of the perovskite LSAT. However, LSAT offers several advantages over LAO, especially in terms of lower defect densities and a lower melting temperature, that allows LSAT to be grown by the Czochralski process (Cz).

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