The structures of YVO4, LuPO4 and LuAsOa have been confirmed as being of the zircon type and have been refined on the basis of several thousand measured X-ray data.Bei der Anwendung eines neuen Modells zur Analyse von Kristallfeldparametern (Newman, 1971 ;Newman & Urban, 1972) Lageparameter der Verfeinerung sind y-und z-Koordinaten ffir die Sauerstoffatome. Die thermischen Parameter der Verfeinerung sind //1~ und fl3a ftir die Atome mit der Lagesymmetrie ~m2, da fl,1 =fizz und ,8~ = 0 (i# k).
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