Abstract
AbstractThe complex dielectric constant, , of PbHPO4 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 of take on values of the order of 104 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 HPO4 groups.
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