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The usefulness of microwave heating and microwave generation of plasma for solid-state synthesis of Sb2Te3 crystals is reported. Lengths of time and molar ratios of Sb:Te were varied to achieve pure products heated by a 900 W microwave-irradiated plasma. In the present research, the products were Sb2Te3 with a rhombohedral crystal system using 2:2, 2:1.75 and 2:1.5 molar ratios of Sb:Te, and lengths of time of 10 and 20 min. Their different crystallographic planes were also detected, including four Raman shifts at 93.9, 102.6, 139.2 and 263.7 cm−1, and direct energy gaps (Eg) in a range of 0.340–0.515 eV.
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Suriwong et al. (2011) studied this question.
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