Displacive components of the low-temperature phase transitions in lawsonite
Displacive components of the low-temperature phase transitions in lawsonite
复制标题
硬铝石中低温相变的位移分量
DOI：
10.2138/am-2001-0419
复制
发表时间：
2001
影响因子：
3.1
通讯作者：
M. Dove
中科院分区：
文献类型：
--
作者：
H. Meyer;S. Marion;P. Sondergeld;M. Carpenter;K. Knight;S. Redfern;M. Dove
摘要 利用 2 至 500 K 范围内的高分辨率、飞行时间中子衍射研究了氘化钠长石中的相变。通过自发应变数据分析，273 K 相变的热力学并未因氘化过程而改变。原子位置随温度的变化表明骨架氧和其中一个氘原子的连续变化，而对于另一个氘原子，在平均结构中观察到更不连续的行为。将 O·D 和 O·O 键长与非氘代硬铝石榴石的 IR 数据进行比较，可以详细分析 O-H 拉伸模式的分配
Abstract The phase transitions in deuterated lawsonite were investigated with high-resolution, time-offlight neutron diffraction between 2 and 500 K. From the analysis of spontaneous strain data, the thermodynamics of the phase transition at 273 K are not changed by the deuteration process. Shifts in atomic positions with temperature indicate continuous changes for a framework oxygen and for one of the deuterium atoms, whereas for the other deuterium atom, a more discontinuous behavior was observed in the average structure. Comparison of O···D and O···O bond lengths with IR data from a non-deuterated lawsonite permits a detailed analysis of assignments of O-H stretching modes