Abstract
The EPR spectroscopy (using as the EPR probe) and optical microscopy studies of pyrochlore were carried out in the temperature range of 80 K-300 K which included phase transitions at and . The evidence for coexistence of a proper ferroelectric-ferroelastic state and an improper ferroelectric-ferroelastic state in the ferroelectric phase of is presented. While the former appears below , the latter comes from the improper ferroelastic state of the precedent phase . The unusual behaviour of the ferroic states on a temperature scale is discussed from the viewpoint of a two-weakly-bonded-network description of the pyrochlore structure.
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