Anomalous conductivity and other properties of V2O5-P2O5 glasses with Bi2O3 OR Sb2O3
Anomalous conductivity and other properties of V2O5-P2O5 glasses with Bi2O3 OR Sb2O3
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Bi2O3 OR Sb2O3 V2O5-P2O5 玻璃的反常电导率及其他性能
DOI：
10.1016/0022-3093(88)90419-x
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发表时间：
1988
影响因子：
3.5
通讯作者：
B. Chaudhuri
中科院分区：
文献类型：
--
作者：
A. Ghosh;B. Chaudhuri
对含Bi2O3或Sb2O3V2O5P2O5玻璃的直流和交流电导、介电常数、扫描电子显微镜、X射线衍射和差热分析进行了研究。在80-420K的温度范围和0.1-100 kHz的频率范围内测量了其电学性质。50V2O5(50−x)P2O5−xBi2O3(x=5-40%)玻璃的直流电导率始终高于纯玻璃50V2O5的直流电导率，而50V2O5-(50−x)P2O5−xSb2O3玻璃的直流电导率始终低于基玻璃。在200K以上，V_2O_5--P_2O_5--B_2O_3玻璃的激活能依赖于B_2O_3的浓度，而V_2O_5--P_2O_5--Sb_2O_3玻璃的激活能几乎与Sb_2O_3的浓度无关。然而，这两种玻璃都表现出有趣的导电性，其最低电导率约为25-30摩尔%的Bi2O3或Sb2O3。这一行为在任何这样的过渡金属氧化物玻璃中都没有发现。在密度、玻璃化转变温度T_g、交流电导率和辩证常数数据的浓度(Bi2O_3或Sb_2O_3)依赖关系中也观察到了反常行为，发现与V~(5+)/V~(4+)之比的最低值有关，出现在Bi2O_3或Sb_2O_3的∼为25-30%时。交流电导率与ωS成正比，其中ω是根据基于跳跃势垒(HOB)模型的理论得到的频率，在0.85%到0.98%之间变化。
To characterize the V2O5P2O5glasses with Bi2O3or Sb2O3, the DC and AC conductivities, dielectric constants, SEM, X-ray diffraction, and DTA studies have been made. Electrical properties have been measured in the temperature range 80–420 K and in the frequency range 0.1–100 kHz. The DC conductivity of the 50V2O5(50−x)P2O5−xBi2O3(x= 5–40 mol%) glasses is found to be always higher than that of the pure base glass 50V2O5P2O5, while the DC conductivity of the 50V2O5-(50−x)P2O5−xSb2O3glasses is always lower than that of the base glass. Above 200 K the activation energy of the V2O5P2O5Bi2O3glasses depends on the concentration of Bi2O3, while that of the V2O5P2O5Sb2O3glasses is almost independent of Sb2O3concentration. However, both of these glasses show an interesting conductivity minimum for about 25–30 mol% of Bi2O3or Sb2O3. This behavior was not found earlier in any such transition metal oxide glasses. The anomalous behavior, also observed in the concentration (Bi2O3or Sb2O3) dependence of the density, glass transition temperatureTg, AC conductivity, and dialectric constant data, is found to be associated with the lowest value of the ratio V5+/V4+occurring at ∼ 25–30 mol% of Bi2O3or Sb2O3. The AC conductivity is found to be proportional toωs, where ω is the frequency andslying between 0.85 and 0.98, obtained from the theory based on the hopping-over barrier (HOB) model.