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Nonisothermal Kinetics of the Solid‐Solid Phase Transitions in the Perovskite Type Layer Compounds (CnH2n+1NH3)2ZnCl4
Author(s) -
WU KeZhong,
LI JianLing,
ZHANG JianJun,
LIU XiaoDi
Publication year - 2008
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200890027
Subject(s) - chemistry , differential scanning calorimetry , kinetics , activation energy , phase transition , hydrocarbon , carbon fibers , phase (matter) , reaction rate constant , analytical chemistry (journal) , crystallography , thermodynamics , organic chemistry , composite material , physics , materials science , quantum mechanics , composite number
Nonisothermal kinetics of the solid‐solid phase transitions in the perovskite type layer compounds (C n H 2 n +1 NH 3 ) 2 ZnCl 4 has been determined for the hydrocarbon chain length from even number 12 to 18 of carbon atoms. The activation energy E a was calculated by the Kissinger and Ozawa methods from the curves of Differential Scanning Calorimetry (DSC) measurements at different heating rates. The results indicated that the values of E a of the phase transitions decreased with increasing chain length and showed a linear dependence on the number of carbon atoms, which was caused by that the order and rigidity of the hydrocarbon chain were decreased with increasing the carbon atoms. The two methods are in agreement with each other. The reaction order n of all materials is one that remains constant independently of the heating rate.