Abstract

Samples in the Li₂O–B₂O₃–Yb₂O₃ system were synthesized and studied by differential thermal analysis, X-ray powder diffraction analysis, and thermodynamic analysis. Polythermal sections and an isothermal section of the phase diagram of this system were constructed. It was shown that the polythermal sections Li₂O ⋅ 3B₂O₃–Yb₂O₃ ⋅ B₂O₃ and Li₂O ⋅ B₂O₃–Yb₂O₃ ⋅ B₂O₃ are non-quasi-binary, and Li₂O ⋅ 2B₂O₃–Yb₂O₃ ⋅ B₂O₃ and Li₆Yb(BO₃)₃–YbBO₃ are quasi-binary. The isothermal section in the Li₂O–B₂O₃–Yb₂O₃ system at 25°C has 15 stable tie lines, which divide the system into 14 triangles of coexisting phases. The compounds 6Li₂O ⋅ Yb₂O₃ ⋅ 3B₂O₃ and 3Li₂O ⋅ 2Yb₂O₃ ⋅ 3B₂O₃ were synthesized, and their physicochemical properties were studied. The temperature dependences of the electrical conductivity of polycrystalline samples in the Li₂O–B₂O₃–Yb₂O₃ system at direct current were investigated. The activation energies of the conduction of semiconducting samples were determined. It was observed that, with adding Yb₂O₃ (x = 0–0.02), the electrical conductivity of samples of the composition (1 – x)Li₂O ⋅ 3B₂O₃–xYb₂O₃ ⋅ B₂O₃ decreases, and the activation energy increases from 0.87 to 0.94 eV.

中文翻译：

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Li 2 O–B 2 O 3 –Yb 2 O 3体系中的相平衡热力学分析和样品的电学性质

摘要

合成并通过差热分析，X射线粉末衍射分析和热力学分析研究了Li ₂ O–B ₂ O ₃ –Yb ₂ O ₃系统中的样品。构造了该系统相图的多热段和等温段。结果表明，在区段polythermal李₂ ö⋅3B ₂ ö ₃ -Yb ₂ ö ₃ ⋅乙₂ ö ₃和Li ₂ ö⋅乙₂ ö ₃ -Yb ₂ ö ₃ ⋅乙₂ ö ₃是非准二进制，和Li ₂ ö⋅2B ₂ ö ₃ -Yb ₂ ö ₃ ⋅乙₂ ö ₃和Li ₆镱（BO ₃）₃ -YbBO ₃是准二进制。Li ₂ O–B ₂ O ₃ –Yb ₂ O ₃系统在25°C时的等温截面具有15条稳定的连接线，这些连接线将系统分为14个共存相的三角形。化合物6Li ₂ ö⋅的Yb ₂ ö ₃ ⋅3B ₂ ö ₃和3Li ₂ø⋅2YB ₂ ö ₃ ⋅3B ₂ ö ₃中合成，并且它们的物理化学性质进行了研究。研究了Li ₂ O–B ₂ O ₃ –Yb ₂ O ₃体系中直流电时多晶样品电导率的温度依赖性。确定了半导体样品的导电活化能。据观察，与加入的Yb ₂ ø ₃（X = 0-0.02），该组合物（1 -的样品的电导率X）栗₂ ö⋅3B ₂ ö₃ - X的Yb ₂ ö ₃ ⋅乙_2度ö ₃降低，从0.87到0.94电子伏特的激活能升高。