TY - JOUR
T1 - Negative Thermal Expansion in Lead-Free La-Substituted Bi0.5Na0.5VO3
AU - Ishizaki, Hayato
AU - Sakai, Yuki
AU - Nishikubo, Takumi
AU - Pan, Zhao
AU - Oka, Kengo
AU - Yamamoto, Hajime
AU - Azuma, Masaki
N1 - Funding Information:
This work was partially supported by Grants-in-Aid for Scientific Research, 18H05208 and 19H05625, from the Japan Society for the Promotion of Science (JSPS) and by Kanagawa Institute of Industrial Science and Technology. The synchrotron radiation experiments were performed at SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (2018B1222, 2018B1860, 2019A1045, and 2019A1688).
Publisher Copyright:
Copyright © 2020 American Chemical Society.
PY - 2020/6/9
Y1 - 2020/6/9
N2 - Negative thermal expansion (NTE) materials, which shrink upon heating, are required in modern technologies. In this study, new lead-free NTE compounds were obtained by substitution of La in PbTiO3 (PT)-type compounds, Bi0.5Na0.5VO3. Decreasing the stereochemical activity by substitution of La for Bi3+ and electron doping by substitution of La for Na+ were found to destabilize the tetragonal phase and cause a temperature-induced transition to a small cubic phase accompanied by NTE. The temperature hysteresis was suppressed because the phase transition was second order-like.
AB - Negative thermal expansion (NTE) materials, which shrink upon heating, are required in modern technologies. In this study, new lead-free NTE compounds were obtained by substitution of La in PbTiO3 (PT)-type compounds, Bi0.5Na0.5VO3. Decreasing the stereochemical activity by substitution of La for Bi3+ and electron doping by substitution of La for Na+ were found to destabilize the tetragonal phase and cause a temperature-induced transition to a small cubic phase accompanied by NTE. The temperature hysteresis was suppressed because the phase transition was second order-like.
UR - http://www.scopus.com/inward/record.url?scp=85088380712&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85088380712&partnerID=8YFLogxK
U2 - 10.1021/acs.chemmater.0c01709
DO - 10.1021/acs.chemmater.0c01709
M3 - Article
AN - SCOPUS:85088380712
VL - 32
SP - 4832
EP - 4837
JO - Chemistry of Materials
JF - Chemistry of Materials
SN - 0897-4756
IS - 11
ER -