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<p>The paper reports on the crystalline structure of a&#xa0;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&#xa0;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&#xa0;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>

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Bi2Ge2O7 crystalline structure: a new metastable compound discovered in the Bi2O3–GeO2 system

  • 期刊论文

  • 发表日期：

    2025年6月24日

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  • 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

摘要

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).