Mechanochemical synthesis of sodium tungsten bronze nanocrystalline powders

作者：Wang, JH^*; Liu, GQ; Du, YW

来源：Materials Letters, 2003, 57(22-23): 3648-3652.

DOI：10.1016/S0167-577X(03)00142-3

• perovskites
• transport mechanisms
• mechanochemical process
• tungsten bronze
• electrical resistivity

Nanocrystalline powders of sodium tungsten bronze NaxWO3 (x similar to 0.88) have been prepared by mechanochemical process using starting materials of Na pieces and WO3 Powders in a planetary ball mill. The synthesis reactions proceed with increasing milling time and are almost completed after 44 It. Phase-pure nanoparticles of NaxWO3 with average size of 17 nm were directly obtained after a simple washing process to remove the by-product of Na2WO4. The resistivity was measured in the temperature range from 77 to 300 K. The sample displays semiconducting behavior and can be characterized by three-dimensional variable-range hopping. The mechanochemical process seems to be an attractive route to fabricate tungsten bronzes because of several advantages such as easy preparation, less cost, operating at low temperature and suitability for a large-scale production.

• 出版日期2003-7
• 单位上海交通大学; 南京大学