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首页> 美国政府科技报告 >Synthesis and characterization of charge-substituted garnets YCaLnGa5O12 (Ln = Ce,Pr,Tb).
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Synthesis and characterization of charge-substituted garnets YCaLnGa5O12 (Ln = Ce,Pr,Tb).

机译：电荷取代石榴石YCaLnGa5O12（Ln = Ce，pr，Tb）的合成与表征。

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摘要

A low temperature method is described for the preparation of the new garnet compounds YCaLnGa(sub 5)O(sub l2) (Ln=Ce, Pr, Th). In this set of compounds (Ca(sup 2+) + Ln(sup 4+)) replaces 2 Y(sup 3+) in the parent gallium based garnet Y(sub 3)Ga(sub 5)O(sub l2) in order to stabilize as effectively as possible the Ln(sup 4+) species in the eight-coordinate ''A'' site of the garnet structure. Characterization of the oxides by x-ray powder diffraction and thermogravimetric analysis is discussed with regard to the structural relationship of the substituted compound to the parent material. The tetravalent ions Pr(sup 4+) and Tb(sup 4+) exhibit increased thermal stability in reducing conditions as compared to the Ln(sup 4+) states in the fluorite (LnO(sub 2)) and perovskite (BaLnO(sub 3)) type structures. This result is discussed with reference to the complex crystal chemistry of these systems.

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