Antiferroelectricity-Induced Negative Thermal Expansion in Double Perovskite Pb 2 CoMoO 6
Materials with negative thermal expansion (NTE) attract significant research attention owing to their unique physical properties and promising applications. Although ferroelectric phase transitions leading to NTE are widely investigated, information on antiferroelectricity-induced NTE remains limite...
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Published in | Small (Weinheim an der Bergstrasse, Germany) Vol. 20; no. 2; p. e2305219 |
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Main Authors | , , , , , , , , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Germany
01.01.2024
|
Subjects | |
Online Access | Get full text |
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Summary: | Materials with negative thermal expansion (NTE) attract significant research attention owing to their unique physical properties and promising applications. Although ferroelectric phase transitions leading to NTE are widely investigated, information on antiferroelectricity-induced NTE remains limited. In this study, single-crystal and polycrystalline Pb
CoMoO
samples are prepared at high pressure and temperature conditions. The compound crystallizes into an antiferroelectric Pnma orthorhombic double perovskite structure at room temperature owing to the opposite displacements dominated by Pb
ions. With increasing temperature to 400 K, a structural phase transition to cubic Fm-3m paraelectric phase occurs, accompanied by a sharp volume contraction of 0.41%. This is the first report of an antiferroelectric-to-paraelectric transition-induced NTE in Pb
CoMoO
. Moreover, the compound also exhibits remarkable NTE with an average volumetric coefficient of thermal expansion α
= -1.33 × 10
K
in a wide temperature range of 30-420 K. The as-prepared Pb
CoMoO
thus serves as a prototype material system for studying antiferroelectricity-induced NTE. |
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ISSN: | 1613-6810 1613-6829 |
DOI: | 10.1002/smll.202305219 |