Giant negative thermal expansion in Fe-doped layered ruthenate ceramics
Giant negative thermal expansion in Fe-doped layered ruthenate ceramics
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DOI：
10.7567/apex.10.115501
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发表时间：
2017-11-01
影响因子：
2.3
通讯作者：
Azuma, Masaki
中科院分区：
文献类型：
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作者：
Takenaka, Koshi;Shinoda, Tsubasa;Azuma, Masaki
研究了铁掺杂对Ca2RuO4-y陶瓷的巨大负热膨胀(NTE)的影响。尽管晶体晶胞体积没有表现出 NTE，但掺铁钌酸盐陶瓷仍表现出较大的 NTE。晶粒的各向异性热应变消耗了烧结体中的开放空间并导致加热时巨大的体积收缩。这种巨大的 NTE 可以在重复的热循环中重现，表明其具有坚韧的微观结构。 Fe掺杂钌酸盐陶瓷粉末的56 vol%负载量将环氧树脂的热膨胀完全抑制在400K以下，表现出钌酸盐烧结体坚韧的微观结构和热膨胀补偿能力。 (C) 2017 日本应用物理学会
The effects of iron doping on the giant negative thermal expansion (NTE) of Ca2RuO4-y ceramics are investigated. Fe-doped ruthenate ceramics exhibit a large NTE even though the crystallographic unit-cell volume shows no NTE. The anisotropic thermal strain of crystal grains consumes open spaces in the sintered body and causes giant bulk volume contraction on heating. This giant NTE is reproducible against repeated thermal cycling, indicating a tough microstructure. The thermal expansion of epoxy resin is fully suppressed below 400K by the 56 vol% loading of the Fe-doped ruthenate ceramic powder, demonstrating tough microstructures and the capability of thermal expansion compensation of the ruthenate sintered body. (C) 2017 The Japan Society of Applied Physics