{"title":"Fluorite Solid Solutions of Congruent Melting in the PbF2–CdF2–RF3 Systems","authors":"I. I. Buchinskaya, P. P. Fedorov","doi":"10.1134/s1063774524600182","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The congruent melting compositions in the <i>M</i>F<sub>2</sub>–<i>M</i>'F<sub>2</sub>–RF<sub>3</sub> systems (<i>M</i> ≠ <i>M</i>' = Ca, Sr, Cd, Ba, Pb; <i>R</i> are rare-earth elements (REEs)) have been determined based on thermodynamic topological analysis. Crystals of fluorite solid solution in the PbF<sub>2</sub>–CdF<sub>2</sub>–<i>R</i>F<sub>3</sub> (<i>R</i> = Tb, Ho, Er, Tm, Yb, Lu) systems were grown by the vertical directional crystallization technique. Their phase composition and distribution of components over the crystalline boule length were investigated. Crystals of congruently melting solid solutions (Pb<sub>0.67</sub>Cd<sub>0.33</sub>)<span>\\(_{{1-x}}\\)</span><i>R</i><sub><i>x</i></sub>F<span>\\(_{{2 + x}}\\)</span> (<i>R</i> = Tb, Ho, Er, Tm, Yb, Lu) were grown for the first time. Traces of low-temperature transformation—a phase isostructural to the Pb<sub>2</sub>YF<sub>7</sub> compound (sp. gr. <i>I</i>4/<i>m</i>), in which Y sites are occupied by the corresponding <i>R</i> cations and Pb sites can be partially occupied by Cd cations—were found in the crystals with <i>R</i> = Ho, Er, Tm, and Yb. The crystals with <i>R</i> = Tb and Lu have a high degree of homogeneity and are suitable for optical studies.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":null,"pages":null},"PeriodicalIF":0.6000,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Crystallography Reports","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1134/s1063774524600182","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CRYSTALLOGRAPHY","Score":null,"Total":0}
引用次数: 0
Abstract
The congruent melting compositions in the MF2–M'F2–RF3 systems (M ≠ M' = Ca, Sr, Cd, Ba, Pb; R are rare-earth elements (REEs)) have been determined based on thermodynamic topological analysis. Crystals of fluorite solid solution in the PbF2–CdF2–RF3 (R = Tb, Ho, Er, Tm, Yb, Lu) systems were grown by the vertical directional crystallization technique. Their phase composition and distribution of components over the crystalline boule length were investigated. Crystals of congruently melting solid solutions (Pb0.67Cd0.33)\(_{{1-x}}\)RxF\(_{{2 + x}}\) (R = Tb, Ho, Er, Tm, Yb, Lu) were grown for the first time. Traces of low-temperature transformation—a phase isostructural to the Pb2YF7 compound (sp. gr. I4/m), in which Y sites are occupied by the corresponding R cations and Pb sites can be partially occupied by Cd cations—were found in the crystals with R = Ho, Er, Tm, and Yb. The crystals with R = Tb and Lu have a high degree of homogeneity and are suitable for optical studies.
期刊介绍：
Crystallography Reports is a journal that publishes original articles short communications, and reviews on various aspects of crystallography: diffraction and scattering of X-rays, electrons, and neutrons, determination of crystal structure of inorganic and organic substances, including proteins and other biological substances; UV-VIS and IR spectroscopy; growth, imperfect structure and physical properties of crystals; thin films, liquid crystals, nanomaterials, partially disordered systems, and the methods of studies.
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