四氯合锌酸十六烷基铵-四氯合锌酸十八烷基铵二元体系亚固相相图  

Subsolidus Binary Phase Diagram of Decylammonium Tetrachlorozincate-Hexadecylammonium Tetrachlorozincate

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作  者:于化江[1,2] 武克忠[2] 

机构地区:[1]沧州师范学院,沧州061001 [2]河北师范大学化学与材料科学学院,石家庄050016

出  处:《应用化学》2012年第1期113-117,共5页Chinese Journal of Applied Chemistry

基  金:国家自然科学基金(21073052);河北省自然科学基金(E2009000307);河北省教育厅基金(2008469);河北师范大学重点基金(L2008Z07)资助项目

摘  要:合成了具有层状结构的热致相变材料四氯合锌酸十六铵(n-C16H33NH3)2ZnCl4,C16Zn)和四氯合锌酸十八铵(n-C18H37NH3)2ZnCl4,C18Zn)(在340~370 K的温度范围内存在着焓值较大的可逆固-固相变)。并将此2种材料在乙醇溶液中结晶出一系列二元体系。对二元体系利用差热分析(DTA)和X射线衍射技术进行测定,构筑了C16Zn-C18Zn二元体系亚固相相图。根据相图,确定了w(C16Zn)=41.11%处有中间化合物(n-C16H33NH3)(n-C18H37NH3)ZnCl4的存在,并测定在w(C16Zn)=16.19%和w(C16Zn)=63.07%2处存在着2个不变的共析点,2个共析点温度分别约为356和353 K。与同类体系的其它相图相比,在此相图的左右边界存在端际固溶体(α和β)和中间区域存在非化学计量相(γ)。Thermotropic layered phase transition compounds decylammonium tetrachlorozincate ( (rt-C16H33NH3) 2ZnCl4, C16Zn ) and hexadecylammonium tetrachlorozincate ( ( n-C18H37NH3 )2ZnC14, C18Zn) were synthesized, and a series of their mixtures were prepared from absolute ethanol. The compounds exhibit high enthalpy solid-solid phase transition in the temperature range of 340 -370 K. Subsolidus binary phase diagram of C16Zn-ClsZn was established by differential thermal analysis and X-ray diffraction. In the phase diagram, new material ( n-C16H33 NH3 ) ( rt-C18H37NH3 ) ZnCl4 at w (C16Zn) = 41.11% and two eutectoid invariants at w(C16Zn) : 16. 19% and w(C16Zn) = 63.07% are observed. Two eutectic point temperatures are about 356 K and 353 K. In contrast to other similar system, there are three noticeable solid solution ranges ((α/β) at the left, right, and middle boundary of the phase diagram, respectively.

关 键 词:四氯合锌酸十六烷基铵 四氯合锌酸十八烷基铵 相图 差热分析 X射线衍射 

分 类 号:O642.3[理学—物理化学]

 

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