摘要
通过（１）ＬｎＯＣｌ／Ｖ＿２Ｏ＿５，（２）ＬｎＣｌ３／Ｖ及（３）ＬｎＯＣｌ／ＬｎＣｌ／Ｖ＿２Ｏ＿５／Ｖ的高温固态化学反应，得到两种稀土钒酸盐：Ｌｎ＿６Ｖ＿３Ｃｌ＿（１０）Ｏ＿（１２）（Ｌｎ＝Ｌａ）及Ｌｎ＿４Ｖ＿５Ｓｉ＿４Ｏ＿（２２）（Ｌｎ＝Ｌａ～Ｎｄ）。Ｌａ＿６Ｖ＿３Ｏ＿（１０）Ｏ＿（１２）晶体呈浅色透明片状，其结构可认为是由［Ｌａ＿３（ＶＯ＿４）＿３Ｃｌ］单元插入到ＬａＣｌ３结构单元中而形成的，在结构中沿ｃ轴方向存在一系列截面积为１９．１的空洞。Ｌｎ＿４Ｖ＿５Ｓｉ＿４Ｏ＿（２２）（Ｌｎ＝Ｌａ，Ｃｅ，Ｐｒ，Ｎｄ）晶体呈，黑色针状，其结构可认为是由交替的稀土钒硅酸盐薄层及钒氧金红石层沿ｃ轴堆叠而表现为准二维Ｃｈｅｖｋｉｎｉｔｅ型结构。
From the solid state reaction of LnOCl/V_2O_5 (1),LnCl_3/V(2) and LnOCl/LnCl_3/V_2O_5/V(3),two type lanthanide vanadate-Ln_6V_3Cl_(10)O_(12)(Ln = La) and Ln_4V_5Si_4O_(22) (Ln = La,Ce,Pr,Nd) crystals can be produced. La_6V_3Cl_(10)O_(12) crystals show pale translucent plate-like shape,its structure can be regarded as [La_3 (VO_4)_3Cl] units inserting into the interlayer of structure of LaCl_3, vacant hexagonal tunnels formed by chloride atoms with across section area of 19.1 are found along c direction.Ln_4V_5Si_4O_(22)(Ln= La, Ce, Pr, Nd) crystals show black needle-like shape,its structure can be regarded as the stacking of lanthanide vanadium silicate slabs and vanadium oxide layers along c direction to show quasi 2D-Chevkinite type structure.
基金
国家自然科学基金
结构化学国家重点实验室基金
福建省自然科学基金
关键词
稀土
钒酸盐
晶体结构
合成
crystal structure,lanthanide vanadate
