Negative thermal expansion induced by intermetallic charge transfer

Masaki Azuma; Kengo Oka; Koichiro Nabetani

doi:10.1088/1468-6996/16/3/034904

Negative thermal expansion induced by intermetallic charge transfer

Sci Technol Adv Mater. 2015 Jun 2;16(3):034904. doi: 10.1088/1468-6996/16/3/034904. eCollection 2015 Jun.

Authors

Masaki Azuma¹, Kengo Oka², Koichiro Nabetani¹

Affiliations

¹ Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan.
² Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan.

Abstract

Suppression of thermal expansion is of great importance for industry. Negative thermal expansion (NTE) materials which shrink on heating and expand on cooling are therefore attracting keen attention. Here we provide a brief overview of NTE induced by intermetallic charge transfer in A-site ordered double perovskites SaCu₃Fe₄O₁₂ and LaCu₃Fe_4-x Mn _x O₁₂, as well as in Bi or Ni substituted BiNiO₃. The last compound shows a colossal dilatometric linear thermal expansion coefficient exceeding -70 × 10^-6 K^-1 near room temperature, in the temperature range which can be controlled by substitution.

Keywords: charge transfer; negative thermal expansion; perovskite; x-ray diffraction.

Publication types

Review