Microstructural effects on negative thermal expansion extending over a wide temperature range in β-Cu1.8Zn0.2V2O7
Microstructural effects on negative thermal expansion extending over a wide temperature range in β-Cu1.8Zn0.2V2O7
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DOI：
10.1063/1.5055304
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发表时间：
2018-10
影响因子：
4
通讯作者：
N. Katayama;K. Otsuka;M. Mitamura;Y. Yokoyama;Y. Okamoto;K. Takenaka
中科院分区：
文献类型：
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作者：
N. Katayama;K. Otsuka;M. Mitamura;Y. Yokoyama;Y. Okamoto;K. Takenaka
我们讨论了β-Cu1.8Zn0.2V2O7具有较大的负热膨胀（NTE）行为和较宽的工作温度窗。同步x射线衍射实验获得的晶体学参数表明，β-Cu1.8Zn0.2V2O7的体积收缩最多保持在Δv/v = 0.83%。相比之下，膨胀测量显示，从100 K到700 K， NTE表现为t线性，从200 K加热到700 K，体积收缩ΔV/V = 2.16%。这一差异表明β-Cu1.8Zn0.2V2O7中的NTE受到微观结构效应的增强，类似于解释层状钌酸盐中巨大的NTE行为。我们进一步讨论了β-Cu1.8Zn0.2V2O7不含昂贵和有毒元素，使其成为实用NTE材料的潜在候选材料。我们讨论了β-Cu1.8Zn0.2V2O7具有较大的负热膨胀（NTE）行为和较宽的工作温度窗。同步x射线衍射实验获得的晶体学参数表明，β-Cu1.8Zn0.2V2O7的体积收缩最多保持在Δv/v = 0.83%。相比之下，膨胀测量显示，从100 K到700 K， NTE表现为t线性，从200 K加热到700 K，体积收缩ΔV/V = 2.16%。这一差异表明β-Cu1.8Zn0.2V2O7中的NTE受到微观结构效应的增强，类似于解释层状钌酸盐中巨大的NTE行为。我们进一步讨论了β-Cu1.8Zn0.2V2O7不含昂贵和有毒元素，使其成为实用NTE材料的潜在候选材料。
We discuss that β-Cu1.8Zn0.2V2O7 exhibits a large negative thermal expansion (NTE) behavior with a wide operating temperature window. The crystallographic parameters obtained by synchrotron x-ray diffraction experiments indicate that the volume contraction of β-Cu1.8Zn0.2V2O7 remains at most Δv/v = 0.83%. In contrast, the dilatometry measurements show T-linear NTE behavior from 100 K to 700 K and a large volume contraction of ΔV/V = 2.16% on heating from 200 K to 700 K. This discrepancy indicates that NTE in β-Cu1.8Zn0.2V2O7 is enhanced by the microstructural effect, similar to that employed for explaining the colossal NTE behavior in layered ruthenates. We further discuss that β-Cu1.8Zn0.2V2O7 is free from expensive and toxic elements, making it a potential candidate for practical NTE materials.We discuss that β-Cu1.8Zn0.2V2O7 exhibits a large negative thermal expansion (NTE) behavior with a wide operating temperature window. The crystallographic parameters obtained by synchrotron x-ray diffraction experiments indicate that the volume contraction of β-Cu1.8Zn0.2V2O7 remains at most Δv/v = 0.83%. In contrast, the dilatometry measurements show T-linear NTE behavior from 100 K to 700 K and a large volume contraction of ΔV/V = 2.16% on heating from 200 K to 700 K. This discrepancy indicates that NTE in β-Cu1.8Zn0.2V2O7 is enhanced by the microstructural effect, similar to that employed for explaining the colossal NTE behavior in layered ruthenates. We further discuss that β-Cu1.8Zn0.2V2O7 is free from expensive and toxic elements, making it a potential candidate for practical NTE materials.