Influence of quenching on the structural and conduction characteristics of lithium sulfate
Influence of quenching on the structural and conduction characteristics of lithium sulfate
复制标题
淬火对硫酸锂结构和导电特性的影响
DOI：
10.1007/s11581-017-2395-0
复制
发表时间：
2018
期刊：
影响因子：
2.8
通讯作者：
K. Hariharan
中科院分区：
文献类型：
--
作者：
S. Varghese;K. Hariharan
采用X射线衍射、扫描电子显微镜、差示扫描量热法（DSC）、振动光谱技术和电导率测量等方法研究了用常规淬火和快速淬火技术从高温熔体中淬火的硫酸锂。用X射线衍射研究了淬火样品的晶体结构，结果显示出较不有序的β-Li 2SO 4相。这伴随着DSC测量中相变温度的降低，沿着伴随着与转变相关的摩尔焓的降低。拉曼和FT-IR光谱研究表明，淬火样品中的无序与SO 42 −离子的基本振动模式相关的频带显着增宽。电导率的温度变化表明，在离子电导率的一个数量级的增强与淬火样品的相变点略低于未淬火的Li 2SO 4。
Lithium sulfate quenched from the high-temperature melt using conventional quenching as well as rapid quenching techniques has been investigated using X-ray diffraction, scanning electron microscope, differential scanning calorimetry (DSC), vibrational spectroscopy techniques, and electrical conductivity measurements. Crystal structure of the quenched samples studied using X-ray diffraction shows a less orderedβ-Li2SO4phase. This is accompanied by a decrease in phase transition temperature in DSC measurements along with a decrease in the molar enthalpy associated with the transition. Raman and FT-IR spectroscopy studies reveal the disorder in the quenched samples by a significant broadening of the bands associated with the fundamental vibrational modes of SO42−ion. Temperature variation of conductivity shows an enhancement in ionic conductivity by one order of magnitude with a slight decrease in phase transition point for quenched samples over unquenched Li2SO4.