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词汇 Silver molybdate
分类 英语词汇 英语翻译词典
释义

Silver molybdate

中文百科

钼酸银

钼酸银(Ag2MoO4)是一种白色到黄色、立方晶系的晶体。

用钼酸钠与硝酸银溶液反应,得到粉末状沉淀的钼酸银,或得到悬浮液。

英语百科

Silver molybdate 钼酸银

Silver molybdate (Ag2MoO4) presents two types of electronic structure, depending on the pressure conditions to which the crystal is subjected. At room temperature, Ag2MoO4 exhibits a spinel-type cubic structure related to beta (β-Ag2MoO4) phase, which is more stable in nature. However, when exposed to high hydrostatic pressure, these crystals have a tetragonal structure associated to alpha (α-Ag2MoO4) metastable phase. Recently, the literature has reported the formation of α-Ag2MoO4 metastable phase by the solution-phase precipitation method under environment condition, and using 3-bis(2-pyridyl)pyrazine (dpp) as doping. The influence of pH at starting solution on the growth and formation processes of distinct heterostructures (brooms, flowers and rods) was investigated by Singh et al. and Fodjo et al., in which the sodium borohydride was employed to induce the reduction of silver nanoparticles on the surface of Ag2MoO4 crystals in order to enhance the Raman scattering. In other studies, Ag-Ag2MoO4 composites prepared by microwave-assisted hydrothermal synthesis presented interesting photocatalytic activity for the degradation of Rhodamine B under visible light. In addition, Ag2MoO4 mixed with graphite acts as a good lubricant for Ni-based composites, improving the tribological properties of this system. Different synthesis methods have been employed to obtain pure β-Ag2MoO4 crystals, including solid-state reaction or oxide mixture at high temperature, melt-quenching and Czochralski growth. Particularly, high temperatures, long processing times, and/or sophisticated equipment are necessary in these synthetic routes. Moreover, the final products may be composed of irregular particle shapes with nonhomogeneous size distribution as well as contain the presence of secondary phases. In recent years, pure β-Ag2MoO4 crystals have been synthesized by the co-precipitation, microwave-assisted hydrothermal synthesis, dynamic template route using polymerization of the acrylamide assisted templates and impregnation/calcination method.

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