DETERMINATION OF DEFECT MOLECULAR UNITS IN K2SnCl6 AND AMMONIUM HALIDES VIA DIPOLAR RELAXATION AT PHASE TRANSITIONSReport as inadecuate




DETERMINATION OF DEFECT MOLECULAR UNITS IN K2SnCl6 AND AMMONIUM HALIDES VIA DIPOLAR RELAXATION AT PHASE TRANSITIONS - Download this document for free, or read online. Document in PDF available to download.



Abstract : Defect molecular units in insulators can be determined by D. C. conductivity and ITC measurements. Conditions are a permanent electric dipole moment of the defect and the occurrence of phase transitions increasing the probability of dipolar relaxation and, thus, the sensitivity of detection. The methods are applied to K2SnCl6, NH4Cl and NH4Br, compounds with quasi-free rotating octahedral anionic and tetrahedral cationic units, respectively. Thermal dissociation or neutron irradiation create stable dipolar defects SnCl5 - or NH3. The reorientation of these units at phase transitions causes sharp depolarization peaks. Defect concentrations at ppb-level can be measured.





Author: J. Winter K. Rössler

Source: https://hal.archives-ouvertes.fr/



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