T. V. Bermeshev, A. N. Zaloga, L. A. Solovyov, M. P. Bundin, A. S. Samoilo, D. V. Khlystov, I. S. Plotnikov, E. V. Mazurova, A. A. Kovaleva, O. V. Yushkova, D. S. Voroshilov, V. M. Bespalov
{"title":"Bi2Ge2O7 crystalline structure: a new metastable compound discovered in the Bi2O3–GeO2 system","authors":"T. V. Bermeshev, A. N. Zaloga, L. A. Solovyov, M. P. Bundin, A. S. Samoilo, D. V. Khlystov, I. S. Plotnikov, E. V. Mazurova, A. A. Kovaleva, O. V. Yushkova, D. S. Voroshilov, V. M. Bespalov","doi":"10.1007/s11015-025-01942-3","DOIUrl":null,"url":null,"abstract":"<div><p>The paper reports on the crystalline structure of a new metastable compound (Bi<sub>2</sub>Ge<sub>2</sub>O<sub>7</sub>) found in the Bi<sub>2</sub>O<sub>3</sub>–GeO<sub>2</sub> system. This new phase was synthesized from powders by slow cooling of the melt in a platinum container from 1125 °C. The X‑ray diffraction analysis was used to determine the monoclinic lattice parameters of the crystalline structure (<i>a</i> = 14.81691(4) Å, <i>b</i> = 5.28586(1) Å, <i>c</i> = 9.45669(4) Å, β = 124.4766(2) deg., <i>V</i> = 610.560(3) Å<sup>3</sup>) and space group <i>C</i>2/<i>c</i>. The sample also contains a small admixture of α‑quartz-type GeO<sub>2</sub> (up to 2 wt. %), which could not be removed at this stage of research. Scanning electron microscopy and energy dispersive analysis revealed that the synthesized samples consist of Bi<sub>2</sub>Ge<sub>2</sub>O<sub>7</sub> plates and Bi<sub>2</sub>Ge<sub>2</sub>O<sub>7</sub>+GeO<sub>2</sub> mixture, which is formed along the plate boundaries. The ratio of the initial components (32:68 mol. %) is the most optimal, as it allows obtaining the minimum content of impurity phase (GeO<sub>2</sub>).</p></div>","PeriodicalId":702,"journal":{"name":"Metallurgist","volume":"69 2","pages":"282 - 290"},"PeriodicalIF":0.8000,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Metallurgist","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s11015-025-01942-3","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"METALLURGY & METALLURGICAL ENGINEERING","Score":null,"Total":0}
引用次数: 0
Abstract
The paper reports on the crystalline structure of a new metastable compound (Bi2Ge2O7) found in the Bi2O3–GeO2 system. This new phase was synthesized from powders by slow cooling of the melt in a platinum container from 1125 °C. The X‑ray diffraction analysis was used to determine the monoclinic lattice parameters of the crystalline structure (a = 14.81691(4) Å, b = 5.28586(1) Å, c = 9.45669(4) Å, β = 124.4766(2) deg., V = 610.560(3) Å3) and space group C2/c. The sample also contains a small admixture of α‑quartz-type GeO2 (up to 2 wt. %), which could not be removed at this stage of research. Scanning electron microscopy and energy dispersive analysis revealed that the synthesized samples consist of Bi2Ge2O7 plates and Bi2Ge2O7+GeO2 mixture, which is formed along the plate boundaries. The ratio of the initial components (32:68 mol. %) is the most optimal, as it allows obtaining the minimum content of impurity phase (GeO2).
期刊介绍：
Metallurgist is the leading Russian journal in metallurgy. Publication started in 1956.
Basic topics covered include:
State of the art and development of enterprises in ferrous and nonferrous metallurgy and mining;
Metallurgy of ferrous, nonferrous, rare, and precious metals; Metallurgical equipment;
Automation and control;
Protection of labor;
Protection of the environment;
Resources and energy saving;
Quality and certification;
History of metallurgy;
Inventions (patents).
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