Zero-Thermal Expansion Composite with Giant Negative Thermal Expansion Powder

Abstract

Thermal expansion causes problems in semiconductor industry and optical communications where precise positioning is required. There are a few materials that show negative thermal expansion (NTE). It was recently found that perovskite Bi_1–xLa_xNiO₃ show giant NTE around room temperature. In this study, BiNi_0.85Fe_0.15O₃ powders were prepared by high-pressure synthesis at 6 GPa and 1000°C and were dispersed in a epoxy resin as filler. TheCTE of BiNi_0.85Fe_0.15O₃ reaches 187 ppm K^–1 and it is demonstrated that 18 vol. % addition of the present compound compensates for the thermal expansion of epoxy resin.