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Phase diagram of ammonium perchlorate: Raman spectroscopic constrains at high pressures and temperatures
The Journal of Chemical Physics ( IF 3.1 ) Pub Date : 2016-06-22 14:52:40 , DOI: 10.1063/1.4953909 Mihindra Dunuwille 1 , Choong-Shik Yoo 1
The Journal of Chemical Physics ( IF 3.1 ) Pub Date : 2016-06-22 14:52:40 , DOI: 10.1063/1.4953909 Mihindra Dunuwille 1 , Choong-Shik Yoo 1
Affiliation
We present the pressure-temperature (PT) induced physical and chemical transformations in ammonium perchlorates (APs) up to 50 GPa and 450 °C, using diamond anvil cells and confocal micro-Raman spectroscopy, which provide new constraints for the phase diagram of AP. The results show spectral evidences for three new polymorphs (III, IV, and VI) of AP, in addition to two previously known phases (I and II), at various PT conditions with varying degrees of hydrogen bonding and lack of strong spectral evidence for previously known high-temperature cubic phase (phase V). Upon further heating, AP chemically decomposes to N2, N2O, and H2O. The present phase diagram is, therefore, in sharp contrast to the previous one, underscoring a rich polymorphism, a large stability field for solids, and a replacement of the melt with a decomposition line.
中文翻译:
高氯酸铵的相图:高压和高温下的拉曼光谱约束
我们介绍了利用金刚石砧池和共聚焦显微拉曼光谱技术,在高达50 GPa和450°C的高氯酸铵(AP)中,压力-温度(PT)引起的物理和化学转变,这为AP的相图提供了新的限制。结果表明,除了两个先前已知的相(I和II)外,在各种PT条件下,氢键结合程度各不相同的AP的三个新的多晶型物(III,IV和VI)的光谱证据,以及缺乏强有力的光谱证据。先前已知的高温立方相(V相)。进一步加热,AP会化学分解为N 2,N 2 O和H 2O.因此,本相图与前一张图形成鲜明对比,强调了丰富的多态性,固体的大稳定性场,以及用分解线代替了熔体。
更新日期:2016-06-23
中文翻译:
高氯酸铵的相图:高压和高温下的拉曼光谱约束
我们介绍了利用金刚石砧池和共聚焦显微拉曼光谱技术,在高达50 GPa和450°C的高氯酸铵(AP)中,压力-温度(PT)引起的物理和化学转变,这为AP的相图提供了新的限制。结果表明,除了两个先前已知的相(I和II)外,在各种PT条件下,氢键结合程度各不相同的AP的三个新的多晶型物(III,IV和VI)的光谱证据,以及缺乏强有力的光谱证据。先前已知的高温立方相(V相)。进一步加热,AP会化学分解为N 2,N 2 O和H 2O.因此,本相图与前一张图形成鲜明对比,强调了丰富的多态性,固体的大稳定性场,以及用分解线代替了熔体。