Proton Glass Dynamics

质子玻璃动力学

• 批准号: 8714487
• 负责人: V. Hugo Schmidt
• 金额: $ 8.4万
• 依托单位: Montana State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-01-15 至 1991-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8714487&HistoricalAwards=false
• 关键词: Proton; Glass; Dynamics

Professor Schmidt will investigate proton glass dynamics using measurements of the dielectric susceptibility and nuclear magnetic resonance techniques at pressures up to 5 kbar and temperatures to 4 Kelvin. The proton glass system, Rb1- x(NH4)xH2PO4, is a mixed system of a ferroelectric and an antiferroelectric. Substitutions with deuterium or arsenic will be made for the hydrogen or phosphorous respectively. The competing ferro- and antiferro-electric interactions prevent a transition to an ordered phase and lead to glassy behavior as evidenced by the dielectric relaxation time. A Monte-Carlo simulation of this system will be carried out. An interpretation based on hindered diffusion of thermally generated intrinsic defects, as developed by the principal investigator, will be applied to the new results.

施密特教授将研究质子玻璃的动力学，使用介电磁化率测量和核磁共振技术，在高达5千巴的压力和4开尔文的温度下。质子玻璃体系Rb1- x(NH4)xH2PO4是铁电和反铁电的混合体系。将分别用氘或砷取代氢或磷。相互竞争的铁电和反铁电相互作用阻止了向有序相的过渡，并导致玻璃态行为，这一点可以通过介电弛豫时间来证明。本文将对该系统进行蒙特卡罗仿真。由首席研究员开发的基于热产生的固有缺陷的阻碍扩散的解释将应用于新的结果。