journal article·2023-02-14

Polar–Nonpolar Transition-Type Negative Thermal Expansion with 11.1% Volume Shrinkage by Design

Takumi Nishikubo, Takashi Imai, Yuki Sakai, Masaichiro Mizumaki, Shogo Kawaguchi, Norihiro Oshime, Ayumu Shimada, Kento Sugawara, Kenji Ohwada, Akihiko Machida, Tetsu Watanuki, Kosuke Kurushima, Shigeo Mori, Takashi Mizokawa, Masaki Azuma

Chemistry of Materials· Volume 35· Issue 3
Publisher page

Abstract

Chemical substitution for the tuning of the working temperature of phase-transition-type negative thermal expansion (NTE) materials generally reduces the volume shrinkage during the transition. We have investigated the effects of electron doping and reduction of 6s 2 lone-pair activity in PbVO 3 with a large polar distortion ( c / a = 1.23) and found that the combination of Bi and Sr substitutions for Pb enables a temperature-induced polar to non-polar transition with 11% volume shrinkage, even larger than the pressure-induced volume collapse of PbVO 3 (∼10.6%), and is the largest value among the NTE materials reported so far. The domain structure of the coexisting cubic and tetragonal phases with such a huge volume difference was successfully observed by high-angle annular dark-field scanning transmission electron microscopy and the spatial distribution of domains by Bragg coherent X-ray diffraction imaging. The temperature hysteresis is reduced by repeated heating/cooling cycles, suggesting that the changes in the domain structure dominate the NTE properties.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Thermal Expansion and Ionic Conductivity · Ferroelectric and Piezoelectric Materials · Microwave Dielectric Ceramics Synthesis

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Kanagawa Institute of Industrial Science and Technology, 705-1 Shimoimaizumi, Ebina, Kanagawa243-0435, Japan

Laboratory for Materials and Structures, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa226-8503, Japan

Japan Synchrotron Radiation Research Institute, SPring-8, 1-1-1 Koto, Sayo, Hyogo679-5198, Japan

Synchrotron Radiation Research Center, Kansai Photon Science Institute, Quantum Beam Science Research Directorate, National Institutes for Quantum Science and Technology (QST), SPring-8, 1-1-1 Kouto, Sayo, Hyogo679-5148, Japan

Toray Research Center, 3-3-7 Sonoyama, Ohtsu, Shiga520-8567, Japan

Department of Materials Science, Osaka Prefecture University, 1-1 Gakuen-cho, Naka, Sakai, Osaka599-8531, Japan

Department of Applied Physics, School of Advanced Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo169-8555, Japan

Funding

Japan Society for the Promotion of Science · Kanagawa Institute of Industrial Science and Technology

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