V. A. Krut’ko, M. G. Komova, R. D. Svetogorov, A. V. Khoroshilov, N. N. Efimov, E. A. Ugolkova
{"title":"溶胶-凝胶法合成的硼酸盐钨酸盐 LnBWO6（Ln = La；La0.999Nd0.001 和 La0.99Gd0.01）的结构和热性能特征","authors":"V. A. Krut’ko, M. G. Komova, R. D. Svetogorov, A. V. Khoroshilov, N. N. Efimov, E. A. Ugolkova","doi":"10.1134/s0036023624600394","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Borate tungstates LnBWO<sub>6</sub> (Ln = La; La<sub>0.999</sub>Nd<sub>0.001</sub> and La<sub>0.99</sub>Gd<sub>0.01</sub>) are synthesized by the Pechini method followed by annealing of the intermediates and examined by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The crystallographic parameters of the synthesized LnBWO<sub>6</sub> are refined by powder X-ray diffraction in two crystal systems: monoclinic (space group <i>P</i>2<sub>1</sub>) and orthorhombic (space group <i>P</i>222). Reversible first-order phase transitions in the synthesized LnBWO<sub>6</sub> are detected by the DSC method, and the temperatures and enthalpies of phase transformations are determined. The doping of LnBWO<sub>6</sub> with Nd<sup>3+</sup> and Gd<sup>3+</sup> ions is shown to decrease the temperature of the LT (low-temperature) → HT (high-temperature) phase transition of LaBWO<sub>6</sub>. Two independent positions of Gd in the La<sub>0.99</sub>Gd<sub>0.01</sub>BWO<sub>6</sub> structure are determined from the experimental electron paramagnetic resonance (EPR) data.</p>","PeriodicalId":762,"journal":{"name":"Russian Journal of Inorganic Chemistry","volume":null,"pages":null},"PeriodicalIF":1.8000,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Features of the Structure and Thermal Properties of Borate Tungstates LnBWO6 (Ln = La; La0.999Nd0.001 and La0.99Gd0.01) Synthesized by the Sol–Gel Method\",\"authors\":\"V. A. Krut’ko, M. G. Komova, R. D. Svetogorov, A. V. Khoroshilov, N. N. Efimov, E. A. Ugolkova\",\"doi\":\"10.1134/s0036023624600394\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<h3 data-test=\\\"abstract-sub-heading\\\">Abstract</h3><p>Borate tungstates LnBWO<sub>6</sub> (Ln = La; La<sub>0.999</sub>Nd<sub>0.001</sub> and La<sub>0.99</sub>Gd<sub>0.01</sub>) are synthesized by the Pechini method followed by annealing of the intermediates and examined by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The crystallographic parameters of the synthesized LnBWO<sub>6</sub> are refined by powder X-ray diffraction in two crystal systems: monoclinic (space group <i>P</i>2<sub>1</sub>) and orthorhombic (space group <i>P</i>222). Reversible first-order phase transitions in the synthesized LnBWO<sub>6</sub> are detected by the DSC method, and the temperatures and enthalpies of phase transformations are determined. The doping of LnBWO<sub>6</sub> with Nd<sup>3+</sup> and Gd<sup>3+</sup> ions is shown to decrease the temperature of the LT (low-temperature) → HT (high-temperature) phase transition of LaBWO<sub>6</sub>. Two independent positions of Gd in the La<sub>0.99</sub>Gd<sub>0.01</sub>BWO<sub>6</sub> structure are determined from the experimental electron paramagnetic resonance (EPR) data.</p>\",\"PeriodicalId\":762,\"journal\":{\"name\":\"Russian Journal of Inorganic Chemistry\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.8000,\"publicationDate\":\"2024-07-31\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Russian Journal of Inorganic Chemistry\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://doi.org/10.1134/s0036023624600394\",\"RegionNum\":3,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"CHEMISTRY, INORGANIC & NUCLEAR\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Russian Journal of Inorganic Chemistry","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1134/s0036023624600394","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}
Features of the Structure and Thermal Properties of Borate Tungstates LnBWO6 (Ln = La; La0.999Nd0.001 and La0.99Gd0.01) Synthesized by the Sol–Gel Method
Abstract
Borate tungstates LnBWO6 (Ln = La; La0.999Nd0.001 and La0.99Gd0.01) are synthesized by the Pechini method followed by annealing of the intermediates and examined by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The crystallographic parameters of the synthesized LnBWO6 are refined by powder X-ray diffraction in two crystal systems: monoclinic (space group P21) and orthorhombic (space group P222). Reversible first-order phase transitions in the synthesized LnBWO6 are detected by the DSC method, and the temperatures and enthalpies of phase transformations are determined. The doping of LnBWO6 with Nd3+ and Gd3+ ions is shown to decrease the temperature of the LT (low-temperature) → HT (high-temperature) phase transition of LaBWO6. Two independent positions of Gd in the La0.99Gd0.01BWO6 structure are determined from the experimental electron paramagnetic resonance (EPR) data.
期刊介绍：
Russian Journal of Inorganic Chemistry is a monthly periodical that covers the following topics of research: the synthesis and properties of inorganic compounds, coordination compounds, physicochemical analysis of inorganic systems, theoretical inorganic chemistry, physical methods of investigation, chemistry of solutions, inorganic materials, and nanomaterials.
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