The Study On The Dielectric Properties Of Organic-inorganic Hybrid Compounds Based On Sb(?),Bi(?)

Phase transition materials are applied widely for their changeable physical properties(optical,electrical and magnetic properties)caused by the external environment(light,temperature and electric field).Various of methods have been tried to design and synthesis this kind of compounds.The organic-inorganic hybrid compounds can combine the advantages of organic materials together with that of inorganic materials,which are regarded as one of the best candidate materials for searching phase transition materials.Thus,the organic amine and antimony halides,bismuth halides were selected in our experiment.We have obtained a series of organic-inorganic hybrid compounds with their crystals,and determined their single crystal structures and dielectric properties.In this paper,we have obtained ten different kinds of organic-inorganic hybrid compounds based on different amines:(C3H7N)2SbI5(1)?(C5Hi6N2)2SbBr5(2)?(C5H16N2)2SbCl5(3)?(C7H10NO)2SbI5(4)?(C7H10NO)2BiI5(5)?(C7H17N)3BiI6(6)?(C6H10N2)SbBr5(7)?(C6H10N2)SbCl5(8)?(C6H10N2)BiCl5(9)?(C6H10N2)SbCl5(10).And the systematic characterizations of powder X-Ray diffraction,X-ray structure and dielectric properties have also been obtained,respectively.The results shows that the compound 1 undergone obvious step-like dielectric anomaly at about 203 K,which may be ascribed to the freezing of atmotic ellipsoid thermal motion at low temperature.In addition,compound 2 also displayed distinct steplike anomalies at 278.3 K caused by the dynamic behavior of the cations along b axis.However,no dielectric anomaly was found in the other compounds,which indicates that there's no structural phase transition.