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The real part of the relative permittivity ε'r as well as the dielectric loss as represented by ε''r for the compounds (CH2)n(NH3)2MCl4−xBrx (where x = 0, 2, n = 2, 3 and M = Cu, Co) have been measured. The measurements were carried out as a function of temperature and frequency. Both ε'r and ε''r show the same relaxation phenomena which involves large reorientable dipoles in the total polarization. The phase transition observed at ~312K for ε'r and ε''r is expected from the variation in the spacing between the adjacent metallic layers arising from the increase in the number of carbon atoms and/or introducing the Br− ions in the out of plane position.
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