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首页> 外文期刊>Materials Science and Engineering. B, Solid-State Materials for Advanced Technology >Electrical conductivity and dielectric properties of some vanadium-strontium-iron unconventional oxide glasses
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Electrical conductivity and dielectric properties of some vanadium-strontium-iron unconventional oxide glasses

机译：某些钒锶铁非常规氧化物玻璃的电导率和介电性能

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摘要

An unconventional oxide glass system of the composition (80 - x)%V_2O_5·x%SrO·20%FeO (0 ≤ x ≤ 40) was prepared by the press-quenching technique. The electrical conductivity (σ_(dc) and σ_(ac)) was measured in the temperature range from 308 to 588 K. σ_(dc) was found to follow a mixed conduction of both small polaron hopping (SPH) and variable range hopping (VRH) mechanisms up to 418 K. Above this temperature σ_(dc) follows SPH conduction mechanism only. σ_(ac) was determined at four frequencies (10~2, 10~3, 10~4, 10~5 Hz). It was found that the correlated barrier hopping (CBH) was the applicable mechanism, and the exponent factor (s) varied from 0.1 to 0.83. The theoretical fitting between the proposed models and the experimental data showed good agreement. σ_(dc) and σ_(ac) were found to decrease with the increase of SrO content, and both the dielectric constant ε ′ and loss ε″ were found to increase with temperature and decrease with the frequency.
机译：通过压淬技术制备了组成为（80-x）％V_2O_5·x％SrO·20％FeO（0≤x≤40）的非常规氧化物玻璃体系。在308至588 K的温度范围内测量了电导率（σ_（dc）和σ_（ac））。发现σ_（dc）遵循小极化子跳跃（SPH）和可变范围跳跃（ VRH）的机制高达418K。在此温度σ_（dc）以上仅遵循SPH传导机制。在四个频率（10〜2、10〜3、10〜4、10〜5 Hz）下确定σ_（ac）。发现相关的势垒跳跃（CBH）是适用的机制，并且指数因子在0.1至0.83之间变化。提出的模型和实验数据之间的理论拟合显示出很好的一致性。随SrO含量的增加，σ_（dc）和σ_（ac）减小，介电常数ε'和损耗ε''均随温度升高而随频率降低。

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