
Negative Thermal Expansion in ZrW2O8 and HfW2O8
1996年12月12日 · Isostructural ZrW2O8 and HfW2O8 show strong negative thermal expansion from 0.3 K up to their decomposition temperatures of approximately 1050 K. This behavior is especially unusual because these c...
锆酸钨 - 百度百科
锆酸钨(Zirconium tungstate)也称为钨酸锆,是一种无机化合物,分子式为Zr (WO4)2,分子量为586.9。 是一种性能十分优异的 负热膨胀 材料,在温度区间0.3-1050.0K的范围内都具有负热膨胀性能。 在 金属基复合材料 、 陶瓷 基复合材料、 水泥 基复合材料和 聚酰胺树脂 复合材料中有广泛应用。 材料 热胀冷缩 是自然界普遍存在的现象,但有的材料却与此相反,热膨胀系数为负,即随着温度升高体积减小,称之为 负热膨胀 材料(简称NTE)或热致收缩材料。 是最近发 …
ZrW2O8 with Negative Thermal Expansion Fabricated at Ultralow ...
2019年8月5日 · Here, an energy-efficient cold sintering process (CSP, 190 °C, 1–240 min, and 350 MPa) was employed to achieve the dense fabrication of ZrW 2 O 8 (∼94.3% relative density and with up to 95.9% relative density after annealing treatment) with …
Crystal growth of ZrW2O8 and its optical and mechanical ...
2012年3月15日 · Here we report a simple, self-seeding, self-fluxing single crystal growth process which resulted in single crystals of ZrW 2 O 8 up to about 4 mm in size. Grown crystals were characterized by X-ray diffraction (XRD), Raman spectroscopy and Fourier transform infrared (FTIR) spectroscopy.
Near-zero thermal expansion of ZrW2O8/Al–Si composites with …
2021年4月15日 · We developed a near-zero thermal expansion ZrW2 O 8/Al–Si composites with three dimensional mutually interpenetrated structure. Pressure infiltration ensured dense structure and mild interface reaction. The resulting composite has ultra-low thermal expansion (1.09 × 10−6 K −1) in a broad temperature range of −50 to 120 °C (ΔT = 170 °C).
First-principles study of electronic structure, optical and phonon ...
2016年12月1日 · ZrW 2 O 8 exhibits isotropic negative thermal expansions over its entire temperature range of stability, yet so far its physical properties and mechanism have not been fully addressed. In this article, the electronic structure, elastic, thermal, optical and phonon properties of α-ZrW2 O 8 are systematically investigated from first principles.
负热膨胀化合物材料ZrW_2O_8的机理与制备技术 - 百度文库
摘要 : 以 zrw2o8 为典例 ,介绍了新型功能材料 ———负热膨胀材料的最新研究进展 ;列举了几种负 热膨胀材料的物理性质和热力学参量 ;叙述了 zrw2o8 的α相 、β相和γ相之间的转变关系和过程 ; 介绍了该类新材料的负热膨胀机理及刚性单元模式和受抑软性模式两种 ...
负热膨胀材料ZrW2O8及其复合材料研究进展 - 百度学术
ZrW2O8是一种优良的各向同性负热膨胀材料。 本文对ZrW2O8的晶体结构、负热膨胀特性和制备方法作了简要介绍,着重论述了以Cu/ZrW2O8、ZrO2/ZrW2O8和聚酰亚胺(Polyimide)/ZrW2O8为代表的ZrW2O8复合材料的研究现状。
"负热膨胀"氧化物材料ZrW_2O_8的研究现状 - 百度学术
在0.5~1050K温度区间,ZrW2O8具有强烈的各向同性"负热膨胀" (NTE)效应,其负热膨胀可由骨架结构中存在低能刚性单元模型 (RUMs)来解释.本文综述了近几年来对ZrW2O8负热膨胀特性及其负热膨胀机理的研究,并对其相变及相变机制做了综述. 百度学术集成海量学术资源,融合人工智能、深度学习、大数据分析等技术,为科研工作者提供全面快捷的学术服务。 在这里我们保持学习的态度,不忘初心,砥砺前行。
Pressure-Induced Amorphization and Negative Thermal Expansion in ZrW2O8
1998年5月8日 · It has recently been shown that zirconium tungstate (ZrW 2 O 8) exhibits isotropic negative thermal expansion over its entire temperature range of stability. This rather unusual behavior makes this compound particularly suitable for testing model predictions of a connection between negative thermal expansion and pressure-induced amorphization.