Crystal structure of ZnWO4 scintillator material in the range of 3–1423 K
Crystal structure of ZnWO4 scintillator material in the range of 3–1423 K
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DOI：
10.1088/0953-8984/21/32/325402
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发表时间：
2009-07
期刊：
影响因子：
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通讯作者：
D. Trots;A. Senyshyn;L. Vasylechko;R. Niewa;T. Vad;V. Mikhailik;H. Kraus
中科院分区：
文献类型：
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作者：
D. Trots;A. Senyshyn;L. Vasylechko;R. Niewa;T. Vad;V. Mikhailik;H. Kraus
用同步加速器和中子粉末衍射法研究了样品在3-300K温度范围内的晶体结构行为。热分析表明，样品加热时在1486K附近熔化，冷却时在1442K附近凝固。因此，还用中子衍射法研究了1423K时的结构。结果表明，在所研究的整个温度范围内，该化合物均为黑钨矿结构。在一阶Grüneisen近似和内能德拜模型的基础上，对ZnWO4在低温下的晶格参数和体积进行了参数化。A轴和b轴的膨胀率相近，接近8×10−6K−1，而c轴的膨胀率要小得多，直到300K都没有饱和。最小膨胀率对应于发生八面体边共享连接的c轴附近的方向。
The behaviour of the crystal structure of ZnWO4 was investigated by means of synchrotron and neutron powder diffraction in the range of 3–300 K. Thermal analysis showed the sample’s melting around 1486 K upon heating and subsequent solidification at 1442 K upon cooling. Therefore, the structure was also investigated at 1423 K by means of neutron diffraction. It is found that the compound adopts the wolframite structure type over the whole temperature range investigated. The lattice parameters and volume of ZnWO4 at low temperatures were parametrized on the basis of the first order Grüneisen approximation and a Debye model for an internal energy. The expansivities along the a- and b-axes adopt similar values and saturate close to 8 × 10−6 K−1, whereas the expansion along the c-axis is much smaller and shows no saturation up to 300 K. The minimum expansivity corresponds to the direction close to the c-axis where edge-sharing linkages of octahedra occur.