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Comparison of the Absorption Spectra of Nd 3+ Ions in the NdFe 3 (BO 3 ) 4 , Nd 0.5 Gd 0.5 Fe 3 (BO 3 ) 4 , and Ho 0.75 Nd 0.25 Fe 3 (BO 3 ) 4 Crystals
Physics of the Solid State ( IF 0.6 ) Pub Date : 2021-02-03 , DOI: 10.1134/s1063783421010200
A. L. Sukhachev , A. V. Malakhovskii , C. S. Nelson , I. A. Gudim , V. L. Temerov

Abstract

The polarized optical absorption spectra in the region of a series of the ff transitions of Nd3+ ions in the Ho0.75Nd0.25Fe3(BO3)4, Nd0.5Gd0.5Fe3(BO3)4, and NdFe3(BO3)4 crystals at 90 K have been compared. The spectral features related to the difference in the local environment of Nd3+ ions in these crystals have been established. In the region of the transition 4I9/24G5/2 + 2G7/2 of Nd3+ ions in the Ho0.75Nd0.25Fe3(BO3)4 crystal, the appearance of some absorption lines at the structural transition R32 → P3121 around ~200 K due to the local symmetry variation has been found. The intensity of these lines smoothly increases with a decrease in temperature from the transition point. The temperature dependence of the lattice parameters of the Ho0.75Nd0.25Fe3(BO3)4 crystal has been measured. It has been found that, at the transition temperature, the lattice parameter a changes stepwise, which is indicative of the occurrence of a first-order phase transition. The lattice parameter c changes smoothly.



中文翻译:

NdFe 3(BO 3)4,Nd 0.5 Gd 0.5 Fe 3(BO 3)4和Ho 0.75 Nd 0.25 Fe 3(BO 3)4晶体中Nd 3+离子的吸收光谱比较

摘要

在Ho 0.75 Nd 0.25 Fe 3(BO 34,Nd 0.5 Gd 0.5 Fe 3(BO 34和NdFe中Nd 3+离子的一系列f - f跃迁区域中的偏振光吸收光谱比较了90 K下的3(BO 34晶体。已经建立了与这些晶体中Nd 3+离子的局部环境差异有关的光谱特征。在该过渡区域49/24 ģ 5/2 + 2 ģ 7/2的Nd 3+在何离子0.75的Nd 0.25的Fe 3(BO 34晶体,一些吸收线处的结构转变的外观- [R 32→ P 3由于局部对称性变化,在〜200 K附近发现了1 21。这些线的强度随着温度从转变点的降低而平滑地增加。Ho 0.75 Nd 0.25 Fe 3(BO 3)已测量4个晶体。已经发现,在转变温度下,晶格参数a逐步改变,这表明发生了一阶相变。晶格参数c平滑变化。

更新日期:2021-02-03
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