nAl~(3+)/(nAl~(3+)+nMg~(2+))对MgAl-NO_3~--LDHs层间域环境影响及控制
Influence of nAl~(3+)/(nAl~(3+)+nMg~(2+)) on the Interlayer Environment of MgAl-NO_3~--LDHs

周翔 ¹ 王林江 ² ^* 谢襄漓 ³

文摘	采用共沉淀法制备了不同层板中Al~(3+)摩尔分数x值(x=nAl~(3+)/(nAl~(3+)+nMg~(2+)),其中x值为0.29~0.6)的MgAl-NO_3~--LDHs化合物,研究了Al~(3+)摩尔分数对MgAl-NO_3~--LDHs层间域环境的影响。XRD分析表明,当x从0.6降至0.29时,MgAl-NO_3~--LDHs的结晶度逐渐提高。LDHs的层间距随x值减小而增大,NO_3~-由x为0.6时的与层板平行排布,变为x为0.29~0.5时的与层板呈倾斜排布。晶胞参数c随着x值的减小而增大,晶胞参数a、沿(003)晶面垂直方向上的晶粒尺寸D_(003)和沿(110)晶面垂直方向上的晶粒尺寸D_(110)受x值变化的影响较为复杂。FT-IR分析表明,在高x值(x为0.4~0.6)时MgAl-NO_3~--LDHs中NO_3~-基团的红外活性增强,而在低x值(x为0.29~0.33)时其红外活性减弱。
其他语种文摘	A series of MgAl-NO_3~--LDHs compounds with different x values(x = nAl~(3+)/(nAl~(3+)+nMg~(2+)) were synthesized by the coprecipitation method.The influence of the x values on interlayer environment of LDHs was studied.XRD patterns showed that the degree of crystallization increased when the x value decreased from 0.6 to 0.29.And the change of basal spacing of LDHs with x values suggested that the arrangement of NO_3~- between the layers was changing.For x=0.6,a "flat-lying" model that the anions were parallel with layer plates was proposed,to the contrast,a "tilt-lying" model was possibly existed for x=0.29~0.5.And lattice parameter c increased with the decrease of x values,however,lattice parameter a,the crystal size along the vertical direction of(003) crystal face(D_(003)) and the size along the vertical direction of(110) crystal face(D_(110)) were intricately influenced by x values.The FT-IR spectrum revealed that the infrared activity of NO_3~- was strengthened for the samples of x=0.4~0.6,but it was weakened for the samples of x=0.29~0.33.
来源	非金属矿 ,2012,35(2):39-42,45 【核心库】
关键词	层状双氢氧化物 ; nAl~(3+)/(nAl~(3+)+nMg~(2+)) ; 层间域环境
地址	1. 桂林理工大学材料科学与工程学院, 中国科学院矿物学与成矿学重点实验室, 广西, 桂林, 541004 2. 桂林理工大学材料科学与工程学院, 广西, 桂林, 541004 3. 桂林理工大学化学与生物工程学院, 广西, 桂林, 541004
语种	中文
文献类型	研究性论文
ISSN	1000-8098
学科	一般工业技术
基金	国家自然科学基金 ; 广西自然科学基金 ; 中国科学院矿物学与成矿学重点实验室合作研究基金 ; 广西研究生教育创新计划项目
文献收藏号	CSCD:4493661