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.
出处
《应用化学》
CAS
CSCD
北大核心
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
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
decylammonium tetrachlorozincate, hexadecylammonium tetrachlorozincate, phase diagram, differentital thermal analysis, X-ray diffraction
