JMTC’s negative thermal expansion material BNFO (BiNi1-xFexO3)is oxide ceramic material with perovskite structure consisting of bismuth, nickel and iron.

It exhibits large negative thermal expansion (up to -187ppm/K) at arbitrary center temperatures of ±20~30℃. Since it has good compatibility with resins such as epoxy and silicone, it can be used to control CTE (coefficient of thermal expansion) of resin composite materials.

Currently, thermal expansion control from 0℃ to 150℃is possible, and applications such as precision injection molding components, adhesives, and  encapsulants are being considered.

We are working on developing products with  expanded  temperature ranges and various particle size options  to meet the demands of each application.

Negative thermal expansion material BNFO is also a thermo-responsive ceramic that causes changes in electrical resistance (electrical conductivity) and thermal resistance (thermal conductivity) in addition to volume contraction due to changes in crystal structure. It is expected to be used as a switching material or sensor material for electronic components by taking advantage of its characteristics as a thermo-responsive ceramic.