Oxygen-Vacancy-Related High Temperature Dielectric Relaxation in (Pb1−x Ba x )ZrO3 Ceramics

2014 ◽  
Vol 98 (2) ◽  
pp. 551-558 ◽  
Author(s):  
Tian-Fu Zhang ◽  
Xin-Gui Tang ◽  
Qiu-Xiang Liu ◽  
Yan-Ping Jiang ◽  
Xian-Xiong Huang
Keyword(s):  
High Temperature ◽  
Oxygen Vacancy ◽  
Dielectric Relaxation

Oxygen-vacancy-related high-temperature dielectric relaxation and electrical conduction in 0.95K0.5Na0.5NbO3–0.05BaZrO3 ceramic

2012 ◽  
Vol 407 (1) ◽  
pp. 136-139 ◽  
Author(s):  
Laijun Liu ◽  
Yanmin Huang ◽  
Yunhua Li ◽  
Meixie Wu ◽  
Liang Fang ◽  
...  
Keyword(s):  
High Temperature ◽  
Oxygen Vacancy ◽  
Dielectric Relaxation ◽  
Electrical Conduction

Oxygen-vacancy-related high-temperature dielectric relaxation in SrTiO3 ceramics

2010 ◽  
Vol 107 (11) ◽  
pp. 114101 ◽  
Author(s):  
Xiaofei Wang ◽  
Xiaomei Lu ◽  
Chao Zhang ◽  
Xiaobo Wu ◽  
Wei Cai ◽  
...  
Keyword(s):  
High Temperature ◽  
Oxygen Vacancy ◽  
Dielectric Relaxation ◽  
Srtio3 Ceramics

scholarly journals Room-temperature oxygen vacancy migration induced reversible phase transformation during the anelastic deformation in CuO

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Lei Li ◽  
Guoxujia Chen ◽  
He Zheng ◽  
Weiwei Meng ◽  
Shuangfeng Jia ◽  
...  
Keyword(s):  
High Temperature ◽  
Oxygen Vacancy ◽  
Room Temperature ◽  
High Temperature Superconductivity ◽  
Experimental Investigations ◽  
Solid State Chemistry ◽  
Vacancy Migration ◽  
Scientific Disciplines ◽  
Anelastic Deformation ◽  
Reversible Phase

AbstractFrom the mechanical perspectives, the influence of point defects is generally considered at high temperature, especially when the creep deformation dominates. Here, we show the stress-induced reversible oxygen vacancy migration in CuO nanowires at room temperature, causing the unanticipated anelastic deformation. The anelastic strain is associated with the nucleation of oxygen-deficient CuOx phase, which gradually transforms back to CuO after stress releasing, leading to the gradual recovery of the nanowire shape. Detailed analysis reveals an oxygen deficient metastable CuOx phase that has been overlooked in the literatures. Both theoretical and experimental investigations faithfully predict the oxygen vacancy diffusion pathways in CuO. Our finding facilitates a better understanding of the complicated mechanical behaviors in materials, which could also be relevant across multiple scientific disciplines, such as high-temperature superconductivity and solid-state chemistry in Cu-O compounds, etc.

Oxygen defect related high temperature dielectric relaxation behavior in (Ba,La)(Zr,Sn,Ti)O3 ceramics

2021 ◽  
Vol 127 (10) ◽  
Author(s):  
Ke Meng ◽  
Wenhua Li ◽  
Xingui Tang ◽  
Xiaobin Guo ◽  
Qiuxiang Liu ◽  
...  
Keyword(s):  
High Temperature ◽  
Dielectric Relaxation ◽  
Relaxation Behavior ◽  
Oxygen Defect ◽  
Dielectric Relaxation Behavior

scholarly journals Dielectric Relaxation Spectroscopy in Synthetic Rubber Polymers: Nitrile Butadiene Rubber and Ethylene Propylene Diene Monomer

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Young Il Moon ◽  
Jae Kap Jung ◽  
Ki Soo Chung
Keyword(s):  
High Temperature ◽  
Dielectric Relaxation ◽  
Temperature Region ◽  
Butadiene Rubber ◽  
Ethylene Propylene Diene Monomer ◽  
Dielectric Relaxation Spectroscopy ◽  
Ethylene Propylene ◽  
Dielectric Relaxations ◽  
Nitrile Butadiene Rubber ◽  
Synthetic Rubber

The dielectric permittivity of synthetic rubber polymers, nitrile butadiene rubber (NBR) and ethylene propylene diene monomer (EPDM), with both frequency and temperature variations, was thoroughly investigated by dielectric relaxation spectroscopy (DRS). The spectrum versus frequency of DRS was analyzed with the semiempirical Havriliak–Negami formula and conductivity contribution by employing the newly developed “dispersion analyzer” analysis program. The main dielectric relaxations called the α- and β-processes, associated with the cooperative motion of chains in polymers, were discovered in the low-temperature region. In the high-temperature region, we found Maxwell–Wagner–Sillars (MWS) relaxation associated with polymer interfacing and normal-mode (α’) relaxation responsible for end-to-end dipole vector motion. The activation energies of schematic molecular chains responsible for the relaxation processes were obtained with the information about its motional mode. The glass transition temperature and dipole moment for the side group were also determined and compared with those from previous studies. In the EPDM specimen, the peaks of α- and β-relaxation merged at high temperature and were separated with decreasing temperature. The first observations of both merging and splitting were consistent with the results on the temperature dependency of the relaxation strength. Both contour mapping and three-dimensional plots for the two rubbers provide visual information for the distribution and mapping of relaxation.

Energetics of the oxygen vacancy order-disorder transition in Ba2In2O5

1993 ◽  
Vol 8 (7) ◽  
pp. 1484-1486 ◽  
Author(s):  
T.R.S. Prasanna ◽  
Alexandra Navrotsky
Keyword(s):  
High Temperature ◽  
Oxygen Vacancy ◽  
Configurational Entropy ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
Scanning Calorimetry ◽  
Disorder Transition ◽  
First Order ◽  
Enthalpy And Entropy ◽  
Entropy Of Transition

The heat capacity and the enthalpy associated with the reported oxygen vacancy order-disorder transition in Ba2In2O5 were measured by high temperature step scanning calorimetry. The transition temperature is 1205 ± 2 K. The transition appears first order or nearly so. The enthalpy and entropy of transition are 1.3 kJ/mol and 1.1 J/mol K, respectively. The latter is only 4.8% of the configurational entropy, arising from mixing one vacancy and five oxygens per formula unit, 22.5 J/mol K. This suggests that the transition involves only a small fraction of the oxygen vacancies and implies extensive short-range order, SRO, in the high temperature phase.

Oxygen vacancy related dielectric relaxation in (Sr1-1.5xBix)TiO3

2001 ◽  
Vol 262 (1) ◽  
pp. 219-225 ◽  
Author(s):  
Zhi Yu ◽  
Chen Ang ◽  
Ruyan Guo ◽  
A. S. Bhalla ◽  
L. E. Cross
Keyword(s):  
Oxygen Vacancy ◽  
Dielectric Relaxation
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