Investigation of the second order transition in lanthanum pentaphosphate

1 January 1978

journal article
research article
Published by Taylor & Francis in Ferroelectrics

Vol. 21 (1) , 571-572
https://doi.org/10.1080/00150197808237332

Abstract

We present a complete determination of the thermal expansion and the elastic constants tensors in LaP₅O₁₄, between 20°C and 200°C, across the 126°C ferroelastic phase transition of this material. The transition is a second order one. Two phenomenological models are consistent with our measurements.

Keywords

This publication has 8 references indexed in Scilit:

Soft modes in ferroelastic LaP5O14 and NdP5O14
Solid State Communications, 1976
Soft acoustic mode in ferroelastic lanthanum pentaphosphate
Solid State Communications, 1976
γ-ray diffractometry: A new technique of measuring the spontaneous shear deformation in ferroelastics: Application to KH2PO4. Comparison with recent measurements of the birefringence
Physical Review B, 1975
Ferroelastic behavior of NdxLa1−xP5O14 crystals
Journal of Applied Physics, 1975
Ferroelastic behavior and the monoclinic-to-orthorhombic phase transition in $M P_{5} O_{14}$ ( $M = L a - T b$ )
Physical Review B, 1975
The high-temperature phase of NdP5O14
Materials Research Bulletin, 1974
Crystal structures of neodymium metaphosphate (NdP₃O₉) and ultraphosphate (NdP₅O₁₄)
Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials, 1974
Brillouin Scattering: A Tool for the Measurement of Elastic and Photoelastic Constants
Physical Review B, 1972