Resistivity Hysteresis of Ag2S Nanocomposites

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• 作者：Sourish Banerjee ; Santanu Bhattacharya ; Dipankar Chakravorty
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：September 13, 2007
• 年：2007
• 卷：111
• 期：36
• 页码：13410 - 13413
• 全文大小：154K
• 年卷期：v.111,no.36(September 13, 2007)
• ISSN：1932-7455

文摘

A low-temperature chemical synthesis route was used to prepare Ag₂S particles with diameters ranging from3 to 39 nm within a silica matrix. The dc electrical resistivity was measured in the temperature range of320-460 K. A drastic reduction in resistivity around 450 K was caused by an order-disorder transition ofAg₂S. The specimens exhibited a hysteresis in resistivity as a function of temperature. The width of thehysteresis was related to the particle size, viz., it increased with an increase in particle size. This is believedto arise due to a reduction in interfacial free energy for crystal formation in the cation sublattice for smallerAg₂S particle sizes.