The complex dielectric constant, t, of PbHPO, is measured in the high temperature range of the paraelectric phase between 420 and 590 K at frequencies below 30 kHz. A dielectric response of relaxation type is observed. The real and imaginary part off: take on values of the order of lo4 at 100 Hz. This response can be well described by a superposition of two Debye-terms with relaxation times in the millisecond region. Arrhenius plots of the real part of the conductivity 'show that the crystal passes to a new phase at about 420 K by an activated process with an activation energy of 1.0 eV. This process is assumed to be due to the onset of hindered rotation of HPO, groups.Die komplexe DK t wird im Hochtemperaturbereich der paraelektrischen Phase von PbHPO, zwischen 420 und 590 K bei Frequenzen unterhalb 30 kHz gemessen. Es wird eine Anomalie vom Relaxatortyp beobachtet bei der Real-und Imaginarteil von E^ Werte der GroRenordnung lo4 bei 100 Hz annehmen. Das dielektrische Verhalten kann gut durch eine Superposition von zwei Debye-Termen beschrieben werden mit Relaxationszeiten im Millisekunden-Bereich. Arrhenius Darstellungen des Realteils der Leitfahigkeit zeigen einen Ubergang in eine neue Phase bei 420 K durch einen aktivierten ProzeD mit einer Aktivierungsenergie von 1,0 eV. Dieser ProzeD kann durch behinderte Rotation von HP0,-Gruppen verursacht sein.
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