Space-charge effects in proustite (Ag3AsS3)

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Abstract
A series of capacitance and dissipation factor (tanδ) measurements were made on single‐crystal specimens of synthetic proustite (Ag3AsS3). The results showed a rise in the dielectric constant (∼3000) with increasing temperature as well as with decreasing frequency (dispersion effects). A model based on an equivalent‐circuit analog of a two‐layer dielectric was used to fit theoretical curves to the data. In this model, one layer is considered to be the space‐charge region, while the other is the crystal bulk. The theoretical and experimental curves show the same general features, although some quantitative differences exist. The true dielectric constant is concluded to be ε′∥c = 22.

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