Enhanced tetragonality and large negative thermal expansion in a new Pb/Bi-based perovskite ferroelectric of (1 – x )PbTiO 3 – x Bi(Zn 1/2 V 1/2 )O 3
- Huazhong University of Science and Technology, Wuhan (China). School of Materials Science and Engineering; Tokyo Inst. of Technology (Japan)
- Univ. of Science and Technology Beijing (China)
- Chinese Academy of Sciences (CAS), Beijing (China)
- Huazhong University of Science and Technology, Wuhan (China). School of Materials Science and Engineering
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Tokyo Inst. of Technology (Japan)
The investigation of a large negative thermal expansion (NTE) over a wide temperature range has been a vital subject in materials science, since the overall coefficient of thermal expansion (CTE) of ordinary materials can be effectively tailored by the introduction of NTE materials. Here, we successfully achieved a large NTE within a broad temperature range in a new Pb/Bi-based ferroelectric of (1 – x)PbTiO3–xBi(Zn1/2V1/2)O3 by means of improving the ferroelectricity of PbTiO3. The current system exhibits an unusual enhanced tetragonality, large spontaneous polarization (PS), and high Curie temperature (TC). Specifically, the x = 0.1 compound exhibits an enhanced CTE of –2.10 × 10–5 °C–1 from room temperature (RT) up to its TC of 600 °C, which is in contrast to that of pristine PbTiO3 (–1.99 × 10–5 °C–1, RT–490 °C). More intriguingly, a large volume shrinkage (ΔV ≈ –1%) has also been observed during the ferroelectric-to-paraelectric phase transition. According to experimental and theoretical studies, the large NTE is attributed to the enhanced PS derived from the strong hybridization of Pb/Bi–O and Ti/Zn/V–O through the substitution of the polar Bi(Zn1/2V1/2)O3 perovskite. The present study demonstrates that a large NTE within a wide temperature range can be achieved in PbTiO3-based ferroelectrics by improving its ferroelectricity through introducing isostructural polar perovskites.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1577110
- Alternate ID(s):
- OSTI ID: 1526079
- Journal Information:
- Inorganic Chemistry Frontiers (Online), Vol. 6, Issue 8; ISSN 2052-1553
- Publisher:
- Royal Society of ChemistryCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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