Thermal expansion behavior of vanadium pernitride, CuAl2-type VN2, synthesized under high pressures

IF 9.1 2区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR Progress in Solid State Chemistry Pub Date : 2023-12-01 DOI:10.1016/j.progsolidstchem.2023.100426

Shuto Asano , Ken Niwa , Takuya Sasaki , Masashi Hasegawa

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Abstract

CuAl₂-type VN₂, which is synthesized under high pressure, is a recoverable material at ambient conditions and has a high bulk modulus. In this study, we investigated the thermal expansion behavior of CuAl₂-type VN₂ by low-temperature X-ray diffraction measurements between 109.3(5) K and 298.3(8) K. The axial thermal expansion coefficient of VN₂ was determined to be α_a = 2.7(9) × 10⁻⁶ K⁻¹ and α_c = 17.8(12) × 10⁻⁶ K⁻¹ at 298.3(8) K, which has large anisotropy similar to that of compression behavior. It is found that the small coefficient of thermal expansion of the a-axis is due to the negative and positive effects on the a-axis length with increasing temperature of the bond angles and bond lengths of VN₂, respectively. As a result, VN₂ exhibits very large anisotropic thermal expansion behavior.

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高压合成过氮化钒cual2型VN2的热膨胀行为

高压合成的cual2型VN2是一种常温可回收材料，具有较高的体积模量。在109.3(5)K ~ 298.3(8) K范围内，通过低温x射线衍射测量研究了cual2型VN2的热膨胀行为。在298.3(8)K范围内，VN2的轴向热膨胀系数为αa = 2.7(9) × 10−6 K−1，αc = 17.8(12) × 10−6 K−1，具有与压缩行为相似的大的各向异性。研究发现，a轴的热膨胀系数较小是由于VN2的键角和键长分别随着温度的升高对a轴长度产生了负影响和正影响。结果表明，VN2表现出非常大的各向异性热膨胀行为。

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来源期刊

Progress in Solid State Chemistry 化学-无机化学与核化学

CiteScore

14.10

自引率

3.30%

发文量

期刊介绍： Progress in Solid State Chemistry offers critical reviews and specialized articles written by leading experts in the field, providing a comprehensive view of solid-state chemistry. It addresses the challenge of dispersed literature by offering up-to-date assessments of research progress and recent developments. Emphasis is placed on the relationship between physical properties and structural chemistry, particularly imperfections like vacancies and dislocations. The reviews published in Progress in Solid State Chemistry emphasize critical evaluation of the field, along with indications of current problems and future directions. Papers are not intended to be bibliographic in nature but rather to inform a broad range of readers in an inherently multidisciplinary field by providing expert treatises oriented both towards specialists in different areas of the solid state and towards nonspecialists. The authorship is international, and the subject matter will be of interest to chemists, materials scientists, physicists, metallurgists, crystallographers, ceramists, and engineers interested in the solid state.