棒状钡铁氧体的反相微乳法制备

A rodlike barium ferrite precursor with an average size of 0.72～19.6 μm and aspect ratio of 2.6～8.3 has been successfully prepared in an inverse microemulsion consisting of isooctane, cetanyl trimethyl ammonium bromide (CTAB), n-C₄H₉OH and water with ammonia and ammonium oxalate as precipitants. On sintering at 780(C, the rodlike precursor particles could be transformed into rodlike particles of barium ferrite(BaFe₁₂O₁₉) with the average size and aspect ratio of 0.69～18.2 μm and 2.3～5.8, respectively. The effect of volume ratio of aqueous phase to oleic phase, the starting concentrations of metal ions and the starting concentration ratios of metal ions to precipitants were investigated.     

钠型蒙脱土悬浮体和水解聚丙烯酰胺体系的负触变现象

由钠型蒙脱土悬 浮体和水解聚丙烯酰胺组成的体系有负触变现象, 对负触变性的形成条件和影响因素作了初步探讨. 并对微观结构作了一些推测.     

[NH4（15—C—5）2][C2（SCN）5配合物的晶体和分子结构

用凝胶法合成了标题化合物［ＮＨ４（１５－Ｃ－５）２］［Ｃｄ２（ＳＣＮ）５］（１５－Ｃ－５＝Ｃ１０Ｈ２０Ｏ５）的晶体，并对其进行了红外光谱，元素分析等各项物理性质的测试，并经Ｘ射线单晶结构分析得到了配合物的全部晶体学数据：Ｍｔ＝９７３．７８，正交晶系，空间群Ｐｎｍａ，晶胞参数α＝１０．５０７（１）Ａ，ｂ＝１６．５８４（２）Ａ，ｃ＝２３．４９４（２）Ａ，Ｖ＝４０９３．８（３）Ａ＾３，Ｚ＝４，Ｄｃ＝２．     

Microcalorimetric Study on the Oscillating System of Two-phase Reaction of Aqueous Acid with Primary Amine in Chloroform

It has been found that the two-phase reactions of aqueous HCl,HOAc or H3PO4 with primary amine N1923 in chloroform are osiclating reactions.Their power-time curves were measured by the titration microcalorimetric method,and the induction period(tin).The first oscillating period(tp.1) and the second oscillating period (tp.2) were determined.The apparent activating parameters and the orders of the oscillating systems were calculated and the following relationships were established:for the oscillating system of hydrochloric acid.     

〔NH_4（15－C－5）_2〕〔Cd_2（SCN）_5〕配合物的晶体和分子结构

用凝胶法合成了标题化合物［ＮＨ４（１５－Ｃ－５）２］［Ｃｄ２（ＳＣＮ）５］（１５－Ｃ－５＝Ｃ１０Ｈ２０Ｏ５）的晶体，并对其进行了红外光谱、元素分析等各项物理性质的测试，并经Ｘ射线单晶结构分析得到了配合物的全部晶体学数据：Ｍｒ＝９７３．７８，正交晶系，空间群Ｐｎｍａ，晶胞参数ａ＝１０．５０７（１）Ａ，ｂ＝１６．５８４（２）Ａ，ｃ＝２３．４９４（２）Ａ，Ｖ＝４０９３．８（３）Ａ３，Ｚ＝４，Ｄｃ＝２．５８０ｇ／ｃｍ３，μ＝１３．３１ｃｍ（－１），Ｆ（０００）＝１９６８，Ｒ＝０．０７０，Ｒω＝０．０８５。结构分析结果表明，配阳离子是由一个ＮＨ４＋和两个１５－Ｃ－５组成的，ＮＨ４＋没有进入１５－Ｃ－５空腔内，而是位于两个１５－Ｃ－５之间，呈夹心结构；配阴离子是以［Ｃｄ２（ＳＣＮ）５］为单元的阴离子长键，其中一组ＳＣＮ－被四个Ｃｄ离子共享，其余两组ＳＣＮ－被两个Ｃｄ离子共享，呈变形八面体构型。配阳离子［ＮＨ４（１５－Ｃ５）２］＋和配阴离子［Ｃｄ２（ＳＣＮ）５］－间靠静电力结合成配合物晶体。