Abstract

A concentration series of (Pb_0.67Cd_0.33)_1 – xMn_xF_2 + х (0 ≤ x ≤ 0.7) solid solution crystals and Cd_0.93Mn_0.07F₂ crystal have been grown from melt by the vertical directional melt crystallization (Bridgman) method in a fluorinating atmosphere. Single-phase crystals with the fluorite structure are obtained by doping Pb_0.67Cd_0.33F₂ with manganese fluoride up to 5 mol %. At higher MnF₂ contents in the crystals, the tetragonal impurity phase, isostructural to the Ba₂MF₆ (M = Mn, Co, Zn) group of compounds, is precipitated. The optical absorption and luminescence of the Cd_0.93Mn_0.07F₂ and (Pb_0.67Cd_0.33)_0.95Mn_0.05F₂ crystals have been investigated. The absorption spectra indicate octahedral symmetry of the environment of Mn²⁺ ions in the ternary crystal (Pb_0.67Cd_0.33)_0.95Mn_0.05F₂. The wide Mn²⁺ luminescence band in (Pb_0.67Cd_0.33)_0.95Mn_0.05F₂, peaking at 605 nm, is observed only at 77 K.

中文翻译：

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CdF 2 -PbF 2 -MnF 2系萤石固溶体晶体的生长及其光谱性质

摘要

将系列浓度的铅（Pb _0.67镉_0.33）_{1 -  X}锰_X ˚F _{2 +  х}（0≤ X ≤0.7）固溶体结晶和Cd _0.93锰_0.07 ˚F ₂晶体已经从熔体通过垂直定向的熔融结晶生长（布里奇曼）方法在氟化气氛中。通过将Pb _0.67 Cd _0.33 F ₂掺杂至多为5 mol％的氟化锰，可以得到具有萤石结构的单相晶体。晶体中MnF ₂含量较高时，与Ba ₂同构的四方杂质相中号˚F ₆（中号=锰，钴，锌）的化合物的基团，沉淀。研究了Cd _0.93 Mn _0.07 F ₂和（Pb _0.67 Cd _0.33）_0.95 Mn _0.05 F ₂晶体的光吸收和发光。吸收光谱表明三元晶体（Pb _0.67 Cd _0.33）_0.95 Mn _0.05 F ₂中Mn ²⁺离子环境的八面体对称性。（Pb _0.67 Cd中的Mn ²⁺宽发光带仅在77 K处观察到_0.33）_0.95 Mn _0.05 F ₂，峰值在605 nm。