聚酯的高温电晕充电和电荷在体内的输运

本文讨论常温和高温下恒压电晕充电聚酯(Mylar PETP)的电荷贮存稳定性问题。比较了聚酯的较低温位(85℃)TSD(thermally stimulated discharge)偶极峰与非极性分子聚合物材料较低温位TSD空间电荷峰对电荷稳定性影响的明显区别。通过不同高温电晕充电和常温充电后TSD过程中电荷重心的迁移,及相应温度下体电导率增长曲线的测量,研究了电导率对注入电荷平均深度的影响和脱阱电荷在该材料内的输运规律。 关键词：     

An Orthorhombic Polymorph of Lanthanum Ultraphosphate LaP_5O_（14）：Synthesis, Structure and Density Functional Study

An orthorhombic polymorph of lanthanum ultraphosphate, LaP5O14, was firstly synthesized by the high temperature solid-state reaction and structurally characterized by single-crystal X-ray diffraction technique. It crystallizes in the orthorhombic Pmna space group with a=13.155(3), b=8.816(2), c=9.115(2) , V=1057.1(4) 3 and Z=4. The structure features (P5O14)3-anionic ribbons linked with neighboring LaO8 polyhedra. The title solid-state compound is an insulator. Theoretically calculated energy band structure, density of states (DOS), and optical response function by density function theory (DFT) for LaP5O14 were also performed.