变温红外确定硫氰化铵固-固相变机理(英文)  

Determinate Mechanism of Solid-Solid Phase Transitions in Ammonium Thiocyanate for Infrared Spectra at Various Temperatures

作　　者：李平[1] 武克忠[1] 张建玲[1] 刘晓地[1] 

机构地区：[1]河北师范大学化学系,石家庄050016

出　　处：《化学研究》2000年第3期46-48,共3页Chemical Research

基　　金：SupportedbythefoundationofHebeiProvinceEducateCommittee( 971 1 6) .

摘　　要：硫氰化铵分子晶体在固 固转变时 ,能可逆地吸收大量的热。作者利用变温红外光谱确定了其固 固相变机理。结果表明 ,随着温度升高 ,固 固转变时分子晶体内相邻的氢键断裂 ,晶型由低对称转变为高对称并引入振动和转动无序 ,吸收大量热。The solid state phase transition in some molecular crystals reversibly absorb large amount of heat.Infrared spectroscopy was performed to determine mechanism on the pure molecular crystals in ammonium thiocyanate,over a range of temperatures including the solid state transformation.Results of these measurements support a mechanism for the solid state transformation which involves reversible breaking of nearestneighbor hydrogen resonance bond in the molecular crystals at the transformation temperatures.

关 键 词：硫氰化铵 固-固相变 红外光谱 晶体结构 

分 类 号：O613.61[理学—无机化学] O792[理学—化学]