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Abstract <p>The transformation of the PdBi compound at high temperatures has been studied using in situ high-temperature single-crystal X-ray diffraction. New data on the crystal structure of the high-temperature PdBi modification have been obtained. The PdBi structure at <i>T</i> = 293, 373, 423, and 473 K is orthorhombic (sp. gr. <i>Cmc</i>2<sub>1</sub>) with the lattice parameters <i>a</i> = 8.7160(3) Å, <i>b</i> = 7.2031(3) Å, <i>c</i> = 10.6631(4) Å, <i>V</i> = 669.45(4) Å<sup>3</sup>, and <i>Z</i> = 16 (293 K). Upon further heating, a phase transition to the high-temperature modification occurs. The PdBi structure at <i>T</i> = 523 and 573 K has been solved in the orthorhombic sp. gr. <i>Cmcm</i>, <i>a</i>&#xa0;= 3.6162(3) Å, <i>b</i> = 10.6446(8) Å, <i>c</i> = 4.4208(4) Å, <i>V</i> = 170.17(3) Å<sup>3</sup>, and <i>Z</i> = 4 (523 K).</p>

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Crystal Structures of the PdBi Polymorphic Modifications from In Situ High-Temperature Single-Crystal X-ray Diffraction Data

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • O. V. Karimova,
  • A. A. Zolotarev,
  • A. A. Mezhueva,
  • L. A. Ivanova,
  • D. A. Chareev

摘要

Abstract

The transformation of the PdBi compound at high temperatures has been studied using in situ high-temperature single-crystal X-ray diffraction. New data on the crystal structure of the high-temperature PdBi modification have been obtained. The PdBi structure at T = 293, 373, 423, and 473 K is orthorhombic (sp. gr. Cmc21) with the lattice parameters a = 8.7160(3) Å, b = 7.2031(3) Å, c = 10.6631(4) Å, V = 669.45(4) Å3, and Z = 16 (293 K). Upon further heating, a phase transition to the high-temperature modification occurs. The PdBi structure at T = 523 and 573 K has been solved in the orthorhombic sp. gr. Cmcm, a = 3.6162(3) Å, b = 10.6446(8) Å, c = 4.4208(4) Å, V = 170.17(3) Å3, and Z = 4 (523 K).