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Rong Y, Li M, Chen J, Zhou M, Lin K, Hu L, Yuan W, Duan W, Deng J, Xing X. Large negative thermal expansion in non-perovskite lead-free ferroelectric Sn2P2S6. Phys Chem Chem Phys 2016; 18:6247-51. [PMID: 26854264 DOI: 10.1039/c6cp00011h] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Functional materials showing both negative thermal expansion (NTE) and physical performance, such as ferroelectricity and magnetism, have been extensively explored in the past decade. However, among ferroelectrics a remarkable NTE was only found in perovskite-type PbTiO3-based compounds. In this work, a large NTE of -4.7 × 10(-5) K(-1) is obtained in the non-perovskite lead-free ferroelectric Sn2P2S6 from 243 K to TC (338 K). Structure refinements and first-principle calculations reveal the effects of the Sn(ii) 5s-S 3p interaction on spontaneous polarization and its correlation with NTE. Then the mechanism of spontaneous volume ferroelectrostriction (SVFS) is verified and it could well elucidate the nature of NTE in ferroelectric Sn2P2S6. This is the first case to demonstrate the unusual NTE behavior by SVFS in a non-perovskite lead-free ferroelectric material.
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Affiliation(s)
- Yangchun Rong
- Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China.
| | - Menglei Li
- Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China
| | - Jun Chen
- Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China.
| | - Mei Zhou
- Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China
| | - Kun Lin
- Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China.
| | - Lei Hu
- Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China.
| | - Wenxia Yuan
- Department of Chemistry and Chemical Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Wenhui Duan
- Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing 100084, China
| | - Jinxia Deng
- Department of Chemistry and Chemical Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Xianran Xing
- Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China.
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