Phase Transition of Hypoxanthinium Nitrate Monohydrate

Ma?gorzata Katarzyna  Cabaj; Paulina Maria  Dominiak

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Phase Transition of Hypoxanthinium Nitrate Monohydrate

机译：硝酸二元盐一水合物的相转变

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Structures of hypoxanthinium nitrate monohydrate crystals were determined at 15 different temperatures ranging from 20 to 285 K. Crystals undergo a phase transition from the twinned, low temperature phase of P 2_(1)/n symmetry into the high temperature Pmnb phase. Sets of X-ray diffraction data acquired at each temperature were subjected to different types of refinement. We found that, as the temperature increases, the layers of hypoxanthinium nitrate monohydrate shift against each other, leading to the negative thermal expansion in one direction and positive one perpendicular to it. Such a phenomenon stops at the point of phase transition when the asymmetry in interactions in the structure disappears.

机译：在20到285 K的15个不同温度下测定了硝酸次黄嘌呤一水合物晶体的结构。晶体经历了从P 2_1）/n对称的孪生低温相到高温Pmnb相的相变。在每个温度下获得的X射线衍射数据集都经过了不同类型的细化。我们发现，随着温度的升高，硝酸次黄嘌呤一水合物的各层相互移动，导致一个方向的负热膨胀和垂直于它的正热膨胀。当结构中相互作用的不对称性消失时，这种现象在相变点停止。

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《Crystal growth & design》 |2021年第1期|共12页
作者
Ma?gorzata Katarzyna Cabaj; Paulina Maria Dominiak;
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Biological and Chemical Research Center Department of Chemistry University of Warsaw;

Biological and Chemical Research Center Department of Chemistry University of Warsaw;

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正文语种 eng
中图分类晶体学;
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Phase Transition of Hypoxanthinium Nitrate Monohydrate

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