(Fe1-xNix)ZrF6固溶体晶体结构与可调控的热膨胀性质

引用本文: 许家乐, 胡磊, 王璐, 邓金侠, 陈骏, 邢献然. (Fe_1-xNi_x)ZrF₆固溶体晶体结构与可调控的热膨胀性质[J]. 物理化学学报, 2018, 34(4): 339-343. doi: 10.3866/PKU.WHXB201709081 shu

Citation: XU Jiale, HU Lei, WANG Lu, DENG Jinxia, CHEN Jun, XING Xianran. Controllable Thermal Expansion and Crystal Structure of (Fe_1-xNi_x)ZrF₆ Solid Solutions[J]. Acta Physico-Chimica Sinica, 2018, 34(4): 339-343. doi: 10.3866/PKU.WHXB201709081 shu

(Fe_1-xNi_x)ZrF₆固溶体晶体结构与可调控的热膨胀性质

北京科技大学物理化学系，北京 100083

通讯作者: 陈骏, Junchen@ustb.edu.cn

基金项目:

国家自然科学基金(91422301, 21231001)和中央高校基础科研业务费专项基金(FRF-TP-14-012C1)资助项目

摘要: 绝大部分物质具有热胀冷缩的基本性质，然而近年来的研究发现一些化合物具有反常的负热膨胀性质，其为有效调节物质热膨胀系数(CTE)提供了可行性，尤其调控各向同性化合物热膨胀性质是一个重要的研究方向。本文以双ReO₃结构的固溶体(Fe_1-xNi_x)ZrF₆为研究对象，对(Fe_1-xNi_x)ZrF₆固溶体的制备、晶体结构以及热膨胀调控开展了深入研究。(Fe_1-xNi_x)ZrF₆固溶体呈现全程固溶特性，通过Ni²⁺对Fe²⁺进行化学替代的方法实现了(Fe_1-xNi_x)ZrF₆热膨胀系数在大范围内的有效调控(−3.24×10⁻⁶– +18.23 × 10⁻⁶ K⁻¹，300–675 K)，尤其，在(Fe_0.5Ni_0.5)ZrF₆化合物中得到了零膨胀性能。作为一种典型的框架结构化合物，晶胞中F原子横向热振动的差异是导致各自不同热膨胀差异的本质原因。该研究给我们提供了一个基于开放式框架结构化合物的热膨胀调控方法。

关键词:

English

Controllable Thermal Expansion and Crystal Structure of (Fe_1-xNi_x)ZrF₆ Solid Solutions

Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, P. R. China

Corresponding author: CHEN Jun, Email: Junchen@ustb.edu.cn; Tel.: +86-10-82375027

Received Date: 09 August 2017
Accepted Date: 07 September 2017
Revised Date: 06 September 2017
Available Online: 15 April 2018
Fund Project:

The project was supported by the National Natural Science Foundation of China (91422301, 21231001) and the Fundamental Research Funds for the Central Universities, China (FRF-TP-14-012C1)

Abstract: Most materials expand on heating and contract on cooling. In the recent years, however, some compounds have been found to exhibit abnormal negative thermal expansion (NTE) behavior; this presents an opportunity to adjust the coefficient of thermal expansion (CTE) of such materials. It is especially important to obtain controllable thermal expansion in isotropic compounds. Herein, we report the preparation, crystal structure, and controllable thermal expansion in double ReO₃-type (Fe_1-xNi_x)ZrF₆ solid solutions. (Fe_1-xNi_x)ZrF₆ exhibits full range solubility. A controllable thermal expansion of (Fe_1-xNi_x)ZrF₆ could be achieved by the chemical substitution of Ni²⁺ for Fe²⁺ over a wide range of CTE from −3.24 × 10⁻⁶ to +18.23 × 10⁻⁶ K⁻¹ (300–675 K). In particular, zero thermal expansion was obtained for the composition (Fe_0.5Ni_0.5)ZrF₆. As a kind of typical framework structure, the transverse thermal vibrations of fluorine atoms are expected to play a critical role in the thermal expansion behavior of double-ReO₃ compounds. This study presents a potential method to tune the thermal expansion of NTE (negative thermal expansion) families which have an open framework structure.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

(Fe_1-xNi_x)ZrF₆固溶体晶体结构与可调控的热膨胀性质

通讯作者: 陈骏, Junchen@ustb.edu.cn

English

Controllable Thermal Expansion and Crystal Structure of (Fe_1-xNi_x)ZrF₆ Solid Solutions

Corresponding author: CHEN Jun, Email: Junchen@ustb.edu.cn; Tel.: +86-10-82375027

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