Abstract

A number of new solid solutions Ca_{3 − 1.5x}Er_x□_0.5xB₂SiO₈ (x = 0–0.4) based on borosilicate Ca₃B₂SiO₈ are synthesized: homogeneous solid solutions with х = 0–0.125 are structurally similar to the low-temperature monoclinic polymorphic modification of β-Сa₃B₂SiO₈; and at 0.16 < х < 0.25, to the high-temperature orthorhombic polymorph α-Сa₃B₂SiO₈. High-temperature X-ray powder diffraction and high-temperature Raman spectroscopy (20–1000°C) are used to study the monoclinic-orthorhombic transition of solid solutions through the two-phase region (0.125 < х <0.16), thermal expansion of monoclinic and orthorhombic solid solutions (x = 0.1, 0.15), and their decomposition with the formation of silicate Ca₂Er₈(SiO₄)₆O₂ above 990°C. According to the data of the optical spectroscopy, it is found that the intensity of the photoluminescence of erbium ions is significantly lower than the intrinsic luminescence of the borosilicate matrix in the entire studied range of concentrations of active ions.

中文翻译：

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Ca 3 – 1.5x Er x□0.5x B 2 SiO 8的新固溶体：同构取代和多晶型物的温度，热膨胀和发光性质的影响下合成，相变

摘要

基于硼硅酸钙Ca ₃ B ₂ SiO ₈，合成了许多新的固溶体Ca _{3 − 1.5 x} Er _x □ _{0.5 x} B ₂ SiO ₈（x = 0–0.4）：х = 0–0.125的均相固溶体在结构上类似于β-大鱼吃小鱼的低温多晶型的单斜变形例₃乙₂的SiO ₈ ; 和在0.16 < х <0.25，至高温正交晶多晶型物α-大鱼吃小鱼₃乙₂的SiO ₈。高温X射线粉末衍射和高温拉曼光谱（20–1000°C）用于研究固溶体通过两相区（0.125 < х <0.16）的单斜晶-斜方晶跃迁，单斜晶系和正交晶系固溶体（x = 0.1，0.15），并在990°C以上分解生成硅酸盐Ca ₂ Er ₈（SiO ₄）₆ O ₂。根据光谱学的数据，发现在整个研究的活性离子浓度范围内，离子的光致发光强度明显低于硼硅酸盐基体的固有发光强度。