Interpretation of the anomalous behaviour of Pb 3 (PO 4 ) 2 above 180°C
- 1 January 1978
- journal article
- research article
- Published by Taylor & Francis in Ferroelectrics
- Vol. 21 (1) , 589-590
- https://doi.org/10.1080/00150197808237338
Abstract
Recent Raman, x-ray and neutron scattering measurements have cast a doubt on the validity of the accepted symmetry change C2/c ← R3m at the 180°C transition of Pb3(PO4)2. We show that these results can be interpreted satisfactorily with help of the existing phenomenological theory, by assuming the occurrence of a new monoclinic phase involving an 8-fold unit cell expansion, between 180°C and 300°C. Dielectric measurements have been performed to explore the validity of this scheme.Keywords
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