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Solvothermal Preparation and Thermal Phase Change Behaviors of Nanosized Tetragonal-Phase Silver Selenide (Ag2Se)

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Abstract:

Nanocrystalline silver selenide (Ag2Se) with an average diameter of 100 nm were prepared by a facile solvothermal method. X-ray energy dispersive (EDS) spectroscopy and X-ray photoelectron spectroscopy (XPS) studies confirmed that the products were pure Ag2Se. Room-temperature powder X-ray diffraction (XRD) measurements indicated that the as-prepared Ag2Se nanocrystals exhibit a metastable tetragonal polymorphic phase, rather than the common orthorhombic phase at room temperature. The variable-temperature XRD and differential scanning calorimetry (DSC) thermal analysis techniques were used to investigate the phase change behaviors of the tetragonal Ag2Se nanocrystals, and the results showed that the low-temperature tetragonal phase transforms to the high-temperature cubic phase at about 106 °C. This transition temperature is lower by ~30 °C than the orthorhombic-cubic transition temperature (133140 °C) previously reported for Ag2Se. Meanwhile, two exothermic peaks, loaded at 61 and 89 °C, respectively, were detected in the cooling DSC scan for the cubic to tetragonal phase transition, and the reason was discussed.

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Periodical:

Advanced Materials Research (Volumes 850-851)

Pages:

128-131

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.850-851.128

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Online since:

December 2013

Authors:

Jun Li Wang, Hui Feng, Wei Ling Fan

Keywords:

Differential Scanning Calorimetry (DSC), Phase Change, Silver Selenide, Solvothermal Synthesis, Tetragonal-Phase, Variable-Temperature XRD

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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