当前位置: X-MOL 学术Thermochim. Acta › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Observation of Dipolar-glass Transition by Adiabatic Calorimetry in C5NH6(BF4)1−(PF6) Solid-solution System
Thermochimica Acta ( IF 3.5 ) Pub Date : 2020-01-01 , DOI: 10.1016/j.tca.2019.178441
Masaki Nomoto , Minoru Hanaya

Abstract In order to elucidate a dipolar-glassy state realized in the solid-solution system of PyH(BF4)1−x(PF6)x (Py = C5NH5) at low temperatures, we investigated thermal properties of the solid solutions by adiabatic calorimetry. The solid solutions with the compositions x = 0.18, 0.51, and 0.89 exhibited enthalpy relaxations characteristic of glass transitions respectively between 30 and 90 K. The enthalpy relaxation time of 103 s at the glass transition temperature was well reproduced by the temperature dependence of dielectric relaxation times obtained by dielectimetry for each solid-solution sample. The result indicates that the calorimetrically observed glass transition is the dipolar-glass transition, and the dipolar-glassy state is revealed to be a thermodynamically non-equilibrium state where the configuration of the electric dipoles are frozen in by slowing down of the thermally activated reorientational motion of the dipoles.

中文翻译:

绝热量热法观察 C5NH6(BF4)1−(PF6) 固溶体系中的偶极玻璃化转变

摘要 为了阐明低温下 PyH(BF4)1−x(PF6)x (Py = C5NH5) 固溶体系统中实现的偶极玻璃态,我们通过绝热量热法研究了固溶体的热性质。组成为 x = 0.18、0.51 和 0.89 的固溶体分别在 30 和 90 K 之间表现出玻璃化转变的焓弛豫特性。玻璃化转变温度下 103 s 的焓弛豫时间通过介电弛豫的温度依赖性很好地再现每个固溶体样品通过介电法获得的时间。结果表明,量热法观察到的玻璃化转变是偶极玻璃化转变,
更新日期:2020-01-01
down
wechat
bug