Structure and Properties of Hydrogen-Charged Electrochromic Nb2O5 Ceramics
(0) Nb2O5 ceramic pellets were prepared through sintering and hydrogen was introduced into Nb2O5 pellets through a process known as electrochemical hydrogen charging, in which Nb2O5 acted as the cathode in a 0.01 M NaOH solution. The color of Nb2O5 was found dramatically darkened after the treatment while X-ray diffraction indicated that there was no change in the crystal structure. I-V and R-T measurements showed that the resistivity was greatly decreased after hydrogen charging and the resistivity exhibited a negative-temperature-coefficient (NTC). It was proposed that hydrogen can be incorporated into Nb2O5 lattice and occupies at some interstitial site. Nb5+ of Nb2O5 is partially reduced to Nb4+ by hydrogen and the NTC-type conduction results from electron transfer between Nb5+ and Nb4+ through a hopping mechanism.
Electrochromic Nb2O5 Hydrogen Donor Resistivity
Ming Jian Ding Wan Ping Chen Yan Hong Gu Yu Wang
Department of Physics, Wuhan University, Wuhan 430072, China Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, China
国际会议
青岛
英文
1619-1622
2009-10-09（万方平台首次上网日期，不代表论文的发表时间）