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Thermal Decomposition and Possible Polymerization in KH2AsO4 Crystal at High Temperatures

The high-temperature transformation of KH 2 AsO 4 was studied by means of impedance spectroscopy, optical microscopy, differential thermal analysis, thermogravimetric methods. The dielectric constant showed a high-temperature anomaly around T P =185°C. The complex impedance spectra near T P were fitted by superposition of two Cole–Cole types of relaxations. The fast component is interpreted by proton migration in the bulk, while the slow component is accounted for as a cluster formation due to breaking and reforming of the hydrogen bond at the surface. Upon heating above 185°C ( T p ), the dark spots appeared at the surface and the their pattern grew up with increasing temperature and time under isothermal condition above 185°C. The thermal transformation which appears around T P =187°C is endothermic in addition to showing weight loss. Our results show evidences that the high-temperature transformation of KH 2 AsO 4 near T P is not a structural phase transition, but an onset of thermal decomposition of K...