Abstract

We have found conditions for reproducible spontaneous crystal growth of (R_xLa_{1 –x})Al_2.07(B₄O₁₀)O_0.6 (R = Ce, Pr; x = 0, 0.003, 0.03, 0.5, 1) dimetaborate solid solutions. The composition and morphology of the crystals have been studied and limitations on isomorphous substitutions on the rare-earth site within the stability range of their structure type have been found out. We have studied the thermal properties of lanthanum dimetaborate. According to differential thermal analysis, X-ray diffraction, and analytical scanning electron microscopy data, this compound melts incongruently in the range 1120–1200°C, with a maximum endothermic peak at 1165°C. The decomposition products have been shown to include Al₁₈B₄O₃₃, Al₄B₂O₉, and LaBO₃.

中文翻译：

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双金属酸盐RAl 2.07（B 4 O 10）O 0.6（R = La，Ce，Pr，Gd）的晶体生长，形态和固溶体组成

摘要

我们发现了（R _x La _{1 – x}）Al _2.07（B ₄ O ₁₀）O _0.6（R = Ce，Pr; x= 0、0.003、0.03、0.5、1）易分解的固溶体。研究了晶体的组成和形态，并发现了在其结构类型的稳定范围内稀土位点上同晶取代的局限性。我们已经研究了重金属镧的热性能。根据差示热分析，X射线衍射和分析型扫描电子显微镜数据，该化合物在1120–1200°C的范围内融化不一致，最大吸热峰位于1165°C。已经显示分解产物包括Al ₁₈ B ₄ O ₃₃，Al ₄ B ₂ O ₉和LaBO ₃。