Colossal Volume Contraction in Strong Polar Perovskites of Pb(Ti,V)O3
- Univ. of Science and Technology Beijing (China). Dept. of Physical Chemistry; Wuhan Univ. of Science and Technology, Wuhan (China). State Key Lab. of Refractories and Metallurgy; Tokyo Inst. of Technology (Japan). Materials and Structures Lab.
- Univ. of Science and Technology Beijing (China). Dept. of Physical Chemistry
- Chinese Academy of Sciences (CAS), Beijing (China). Technical Inst. of Physics and Chemistry, Center for Crystal R&D and Key Lab. of Functional Crystals and Laser Technology
- Tokyo Inst. of Technology (Japan). Materials and Structures Lab.
- Argonne National Lab. (ANL), Argonne, IL (United States). X-Ray Science Division
- Wuhan Univ. of Science and Technology, Wuhan (China). State Key Lab. of Refractories and Metallurgy
The unique physical property of negative thermal expansion (NTE) is not only interesting for scientific research but also important for practical applications. Chemical modification generally tends to weaken NTE. It remains a challenge to obtain enhanced NTE from currently available materials. Herein, we successfully achieve enhanced NTE in Pb(Ti1-xVx)O3 by improving its ferroelectricity. With the chemical substitution of vanadium, lattice tetragonality (c/a) is highly promoted, which is attributed to strong spontaneous polarization, evidenced by the enhanced covalent interaction in the V/Ti-O and Pb-O2 bonds from first principles calculations. As a consequence, Pb(Ti0.9V0.1)O3 exhibits a nonlinear and much stronger NTE over a wide temperature range with a volumetric coefficient of thermal expansion αv = -3.76 X 10-5/ºC (25-550 ºC). Interestingly, an intrinsic giant volume contraction (~3.7%) was obtained at the composition of Pb(Ti0.7V0.3)O3 during the ferroelectric-to-paraelectric phase transition, which represents the highest value ever reported. Such volume contraction is well correlated to the effect of spontaneous volume ferroelectrostriction. This study extends the scope of the NTE family and provides an effective approach to explore new materials with large NTE, such as through adjusting the NTE-related ferroelectric property in the family of ferroelectrics.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; National Natural Science Foundation of China (NSFC); Thousand Talents Plan (China); Ministry of Education (MOE) (China); Japan Synchrotron Radiation Research Inst. (JASRI), Hyogo (Japan); Kanagawa Inst. of Industrial Science and Technology (KISTEC), Kanagawa (Japan)
- Grant/Contract Number:
- AC02-06CH11357; 91422301; 21231001; 21590793; 2015B1127; 2016A1060; 2016B1850
- OSTI ID:
- 1461291
- Journal Information:
- Journal of the American Chemical Society, Vol. 139, Issue 42; ISSN 0002-7863
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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