Tuning thermal expansion and phase transition temperature with Mg substitution in Zn2V2O7

IF 3.2 3区 化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR Journal of Solid State Chemistry Pub Date : 2025-03-10 DOI:10.1016/j.jssc.2025.125296
Garrett Mahler , Charles Iyare Jr. , Carolina Avalos , Seongyoung Kong , Kirill Kovnir , Joya A. Cooley
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Abstract

The thermal expansion coefficient of a material exhibiting negative thermal expansion above 400 °C, Zn2V2O7, was tuned using Mg as a substituent on the Zn site. Samples x=0.0,0.1,0.2 and 0.3 were prepared using high-temperature ceramic methods. Changes to the structure and properties with Mg substitution were analyzed using Rietveld refinement of ambient and variable-temperature X-ray diffraction data (VTXRD) using synchrotron radiation. The parent structure Zn2V2O7 transitions from the α phase (C2/c) to the β phase (C2/m) near 650 °C, and Mg substitution lowers the temperature of this transition as corroborated by differential scanning calorimetry measurements. Mg substitution allows the volume thermal expansion coefficient to be tuned from –19.80 ppm K−1 in x=0.0 to –13.46 ppm K−1 in x=0.3.

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来源期刊
Journal of Solid State Chemistry
Journal of Solid State Chemistry 化学-无机化学与核化学
CiteScore
6.00
自引率
9.10%
发文量
848
审稿时长
25 days
期刊介绍: Covering major developments in the field of solid state chemistry and related areas such as ceramics and amorphous materials, the Journal of Solid State Chemistry features studies of chemical, structural, thermodynamic, electronic, magnetic, and optical properties and processes in solids.
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