Negative thermal expansion in α-Zr2SP2O12 based on phase transition- and framework-type mechanisms
Negative thermal expansion in α-Zr2SP2O12 based on phase transition- and framework-type mechanisms
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DOI：
10.1038/s41427-020-00266-9
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发表时间：
2020-12
影响因子：
9.7
通讯作者：
T. Isobe;Y. Hayakawa;Yuri Adachi;R. Uehara;S. Matsushita;A. Nakajima
中科院分区：
文献类型：
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作者：
T. Isobe;Y. Hayakawa;Yuri Adachi;R. Uehara;S. Matsushita;A. Nakajima
具有负热膨胀系数（CTE）的材料可用于制备具有特定CTE值的复合材料。负热膨胀行为主要归因于两种类型的机制：相变和骨架型机制。本文报道了Zr_2SP_2O_（12），它具有独特的负热膨胀行为，涉及两种机制。Zr_2SP_2O_（12）在453 K发生骨架型相变<393 K or >，在393-453 K发生等对称相变。α-Zr 2SP 2 O 12的体积CTE约为-70 p. p.m./在等对称相变过程中，该值可以通过降低硫的比例来降低。α-Zr2S0.9P2O12-δ的最小体积CTE为~−108 p. p.m./在393-453 K温度范围内，温度为100 - 1000 K。在303 ~ 773 K之间，α-Zr2S0.9P2O12 − δ的体积减少了约1.3%。最后，本文提出了水热合成α-Zr 2SP 2 O 12的方法和控制硫含量的方法。
Materials with negative coefficients of thermal expansion (CTEs) can be used to prepare composites with specific CTE values. Negative thermal expansion behavior can be primarily attributed to two types of mechanisms: phase transition- and framework-type mechanisms. This paper reports Zr2SP2O12, which has unique negative thermal expansion behavior involving both mechanisms. Zr2SP2O12undergoes a framework-type mechanism at temperatures <393 K or >453 K and an isosymmetric phase transition at 393–453 K. The volumetric CTE of α-Zr2SP2O12is ~−70 p.p.m./K during the isosymmetric phase transition, and this value can be decreased by decreasing the proportion of sulfur. The minimum volumetric CTE of α-Zr2S0.9P2O12-δis ~−108 p.p.m./K in the temperature range of 393–453 K. Between 303 and 773 K, the volume of α-Zr2S0.9P2O12 − δis reduced by ~1.3%. Finally, this paper presents methods for the hydrothermal synthesis of α-Zr2SP2O12and for controlling the sulfur content.