Ferroelastic phase transition in T1H2PO4

Article abstract of DOI:10.1143/JPSJ.53.910

The dielectric constant along the b axis, ε_b, of T1H ₂PO₄ was measured and its domain structures were observed. It is found that T1H₂PO₄ is ferroelastic with the spontaneous shear strain x_5S=2.3 × 10² at room temperature and undergoes a ferroelastic phase transition at 84 °C (T ₁), above which x_5S vanishes. ε_b shows a small anomaly at T₁. There are two kinds of domain structures at room temperature; one is the domain structure with the (100) and/or (001) domain walls which disappears above T₁ and the other is the structure with the (201) wall which has no relation with the 84 °C transition.

Full text of DOI:10.1143/JPSJ.53.910

J. Phys. Soc. Jpn. Downloaded from journals.jps.jp by Freie Universitat Berlin on 03/01/17

J. Phys. Soc. Jpn. Downloaded from journals.jps.jp by Freie Universitat Berlin on 03/01/17

J. Phys. Soc. Jpn. Downloaded from journals.jps.jp by Freie Universitat Berlin on 03/01/17