Invar, or FeNi36, is an iron-nickel alloy that lacks expansion or contraction with temperature changes. This type of material is important now in controlling thermal expansion of composites in nanometer-size electronic circuits and is significant in the future production of products such as fuel cells and thermoelectric devices. Invar gives researchers a highly stable material for precision instruments, clocks or seismic creep gauges.
"NTE materials will expand our capability of thermal-expansion control, opening a new paradigm of materials science and technology thermal-expansion-adjustable composites,” Takenaka notes in his paper.
Read more from the National Institute for Materials Science in Tsukuba, Japan, at http://pdf.japancorp.net/english/clientreports/4184/210.pdf.
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