الفهرس 
Electrical and magnetic studies of some organic-inorganic hybrids
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Abstract
In this thesis, six hybrid halide perovskites namely (n-CnH₂n+1NH₃)2MCl₄ where M= Cu and Co and n= 8, 10 and 12 have been synthesized and characterized thermally, electrically and magnetically. Each member of the Cu-halides undergoes two structural phase transitions associated with a color change and behaves magnetically as paramagnetic in the high temperature and ferromagnetic in the low temperature region, whereas only one structural phase transition was observed in the case of each member of Cohalides. Moreover, the hybrids behave as antiferromagnetic in the very low temperature region (liquid Helium temperature).The behavior of the ac conductivity for all of the investigated Cu- and Cohalides is in agreement with Jonscher{u2019}s universal power law. Based on the crystal structures and the arrangement of molecules in the unit cell, with special attention to the hydrogen bonding systems, we can be able to explain the behavior of all the observed structural phase transitions