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首页> 外文期刊>Crystallography reports >Nanostructured crystals of fluorite phases Sr1-x R (x) F2+x (R are rare-earth elements) and their ordering. I. Crystal growth of Sr1-x R (x) F2+x (R = Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu)
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Nanostructured crystals of fluorite phases Sr1-x R (x) F2+x (R are rare-earth elements) and their ordering. I. Crystal growth of Sr1-x R (x) F2+x (R = Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu)

机译：萤石相Sr1-x R（x）F2 + x（R是稀土元素）的纳米结构晶体及其有序性。 I.Sr1-x R（x）F2 + x的晶体生长（R = Y，La，Ce，Pr，Nd，Sm，Gd，Tb，Dy，Ho，Er，Tm，Yb和Lu）

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摘要

Crystals of nonstoichiometric phases Sr1 - x R (x) F2 + x (R are 14 rare-earth elements) and the ordered phase Sr4Lu3F17 with a trigonally distorted fluorite lattice were grown by the Bridgman method. Ten of 26 Sr1 - x R (x) F2 + x crystals, where R = La-Ho or Y, melt congruently. The isoconcentration series Sr-0.90 R F-0.10(2.10) includes four crystals with R = Er-Lu. The compositions corresponding to the maxima for the latter crystals were not determined. The concentration series, in which the mole fraction of RF3 varies from 10 to 50 mol %, were obtained for the crystals with R = La, Nd, and Gd. Most of the crystals are of good optical quality. To evaluate the composition changes in the course of crystal growth, the cubic unit-cell parameters were determined by X-ray powder diffraction. The line-broadening analysis revealed a nonmonotonic change of microdistortions as regards both the rare-earth content and rare-earth series. The changes in the lattice parameters and the congruent-melting points of the Sr1 - x R (x) F2 + x phases in the rare-earth series reflect the morphotropic transitions in the series of pure RF3 despite the fact that SrF2 dominates in nonstoichiometric fluorite crystals.
机译：通过Bridgman方法生长了非化学计量相Sr1-x R（x）F2 + x（R为14个稀土元素）和具有三角形扭曲萤石晶格的有序相Sr4Lu3F17晶体。 26个Sr1-x R（x）F2 + x晶体中有十个（其中R = La-Ho或Y）完全融化。等浓度系列Sr-0.90 R F-0.10（2.10）包含四个R = Er-Lu的晶体。未确定对应于后者晶体的最大值的组成。对于具有R ＝ La，Nd和Gd的晶体，获得了浓度系列，其中RF3的摩尔分数在10至50mol％之间变化。大多数晶体具有良好的光学质量。为了评估晶体生长过程中的组成变化，通过X射线粉末衍射确定了立方晶胞参数。线宽分析表明，在稀土含量和稀土系列方面，微观变形均非单调变化。尽管SrF2在非化学计量萤石中占优势，但稀土系列中Sr1-x R（x）F2 + x相的晶格参数和全融点的变化反映了纯RF3系列中的向变质转变。晶体。

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