Negative thermal expansion material BNFO
JMTC’s negative thermal expansion material BNFO (BiNi1-xFexO3)is oxide ceramic material with perovskite structure consisting of bismuth, nickel and iron.
BNFO shows a large negative thermal expansion coefficient of -187 ppm/K.
These properties are caused by phase transitions and its temperature is controlable.
(BNFO-15 :near room temperature, BNFO-10 :higher temperature around 100degC)
Electrical resistivity and thermal conductivity also change at the temperature.
It is expected to be mainly used as a filler to reduce CTE (coefficient of thermal expansion) in resin composite materials such as encapsulant or adhesive.
Also, it is expected to use material for sensor or thermistor.