Abstract
The compound Pb3P2O8 has a low temperature monoclinic phase with space group C2/c and a high temperature phase with space group [Formula: see text], both with two crystallographically inequivalent cationic sites. X-ray data taken at five temperatures have indicated that an F-centered monoclinic cell is developed prior to its transition to the rhombohedral phase. The EPR spectra at room temperature show that Mn2+ substitutes only at the cationic site on the twofold axis. A phase transition occurs at 185 °C and approaching this temperature from below the magnetic axes in the ac plane rotate continuously, by about 40°. At 185 °C the Z axis coincides with the c axis of the hexagonal cell (a* axis of the monoclinic cell). The crystal field splitting parameter b20 increases from −423 G to −222 G while b22 goes from 280 G to zero. A model based on the theory of Blume and Orbach for the zero-field splitting and with point charges as the source of the electric field is used to relate the EPR parameters to the atomic displacements.
Publisher
Canadian Science Publishing
Subject
General Physics and Astronomy
Cited by
31 articles.
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