富硼稀土硼化物NdB_6的高温高压合成

SYNTHESIS OF BORON RICH BORIDE NdB 6 UNDER HIGH PRESSURE AND HIGH TEMPERATURE

提出了一种在高温高压极端条件下合成富硼稀土硼化物ＮｄＢ６的新方法，即以稀土氧化物Ｎｄ２Ｏ３为钕源与单质硼反应的方法获得了稀土六硼化物ＮｄＢ６。并对合成产物进行了粉末Ｘ射线衍射分析。结果表明在配比为ＮｄＢ＝１６时，压力为４．０ＧＰａ、温度为１６００℃、反应时间为１５ｍｉｎ的条件下，获得了单相性非常好的ＮｄＢ６。高温高压合成ＮｄＢ６方法具有反应条件易达到、合成时间短、反应产物单相性好等优点。其ＸＲＤ结果表明该合成产物为立方结构，晶格常数为ａ＝０．４１７ｎｍ。

A new route is reported to prepare boron rich rare earth boride NdB 6 under extreme of high pressure and high temperature conditions,i.e.oxidizing amorphous elemental boron with rare earth oxide Nd 2O 3.Products are analysized by X ray powder diffraction.Tesults show that the pure phase of NdB 6 is obtained under the condition of Nd∶B=1∶6,4.0GPa,1600℃ and 15min.The method to prepare NdB 6 under high pressure and high temperature has many advantages such as easy acquiring in reaction conditions,short reaction time and pure phase of the product ect..The results of XRD indicate that the crystallized product in cubic symmetry has lattice constant a =0 417 nm.