Abstract
Thermally stimulated depolarisation current (TSDC) studies are carried out in three hydrogen-bonded crystals, namely, (N2H6)SO4, (NH2)3H(SO4), and Li(NH4)SO4. These three crystals are chosen to represent three categories wherein the dipoles are induced by impurities in the crystal, the NH3 dipoles already exist in the crystal, and the crystal possesses inherent dipole moment. TSDC peaks are observed in all the three systems and their activation energies and frequency factors are evaluated. The observed peaks are explained taking into account the nature of impurity–vacancy dipoles and the dipoles inherently present in these systems. Thermisch stimulierte Depolarisationsstrome (TSDC) werden in drei Kristallen mit Wasserstoff-bindungen, (N2Hg)SO4, (NH4)3H(SO4)2 und Li(NH4SO4 untersucht. Diese drei Kristalle werden zur Darstellung dreier Kategorien gewahlt, bei denen die Dipole durch Storstellen im Kristall induziert werden, NH3-Dipole bereits im Kristall existieren und der Kristall innere Dipolmomente besitzt. TSDC-Maxima werden in allen drei Systemen beobachtet und ihre Aktivierungsenergien und Frequenzfaktoren berechnet. Die beobachteten Maxima werden unter Beriicksichtigung der Art der Storstellen–Leerstellen-Dipole und der inherent vorhandenen Dipole in diesen Systemen erklart.
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