The general formula is M I x WO 3 . It is one of the so-called non-stoichiometric compounds in which alkali metal and other metal atoms are inserted into tungsten oxide in a non-stoichiometric ratio, and is so named because it has a bronze-like luster similar to metal, exhibits weak paramagnetism, and is also electrically conductive. M I = Na, K, etc. are typical, and many others such as Cu and Ag are also known. Na x WO 3 ( x < 1) can be obtained by mixing Na 2 WO 4 , W, and WO 3 thoroughly and igniting in a vacuum or in an inert gas (950°C), or by melting a mixture of WO 3 and Na 2 CO 3 and electrolyzing it. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
一般式MIxWO3。タングステン酸化物にアルカリ金属その他の金属原子が非化学量論比で侵入した,いわゆる不定比化合物の一つで,外見が金属に似たブロンズ様光沢があり,弱い常磁性を示し,しかも電導性があるので,このように呼ばれる。MI=Na,Kなどが代表的なもので,そのほかCu,Agなど多くのものが知られている。NaxWO3(x<1)は,Na2WO4,W,WO3をよく混合して真空中もしくは不活性気体中で強熱するか(950℃),WO3とNa2CO3混合物を融解して電解するなどして得られる。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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