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Electrical Properties of Nb‐, Ga‐, and Y‐Substituted Nanocrystalline Anatase TiO2 Prepared by Hydrothermal Synthesis

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Nanocrystalline anatase titanium dioxide powders were produced by a hydrothermal synthesis route in pure form and substituted with trivalent Ga3+ and Y3+ or pentavalent Nb5+ with the intention of creating acceptor or donor states, respectively. The electrical conductivity of each powder was measured using the powder‐solution‐composite (PSC) method. The conductivity increased with the addition of Nb5+ from 3 × 10−3 S/cm to 10 × 10−3 S/cm in as‐prepared powders, and from 0.3 × 10−3 S/cm to 0.9 × 10−3 S/cm in heat‐treated powders (520°C, 1 h). In contrast, substitution with Ga3+ and Y3+ had no measureable effect on the material's conductivity. The lack of change with the addition of Ga3+ and Y3+, and relatively small increase upon Nb5+ addition is attributed to ionic compensation owing to the highly oxidizing nature of hydrothermal synthesis.
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Document Type: Research Article

Publication date: October 1, 2012

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