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Ferroelastic domains in lead phosphate-arsenate: An afm,X-ray diffraction,tem and Raman study |
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| Authors: | Ulrich Bismayer Dagmar Mathes Mois Aroyo Dirk Bosbach Andrew Putnis Gustaaf Van Tendeloo |
| Institution: | 1. Mineralogisch-Petrographisches Institut, Universit?t Hamburg , Grindelallee 48, Hamburg, Germany , 20146;2. Departamento de Fisica de la Materia Condensada, Facultad de Ciencias , Universidad del Pais Vasco , Apartado 644, Bilbao, Spain , 48080;3. Institut für Mineralogie, Universit?t Münster , Corrensstr. 24, Münster, 48149;4. EMAT, University of Antwerp RUCA , Groenenborgerlaan 171, Antwerp, Belgium |
| Abstract: | Ferroelastic domain patterns in lead phosphate-type crystals depend on their chemical composition. The intersection of ferroelastic W domain walls with the (100) surface of lead phosphate-arsenate mixed crystals has been imaged using tapping mode atomic force microscopy. Dilution of the strain leads to characteristic surface deformations which deviate from those in pure lead phosphate. In highly twinned lead phosphate-arsenate X-ray diffraction was used to show renormalization effects and scattering phenomena stemming from the twin walls. Raman-active hard modes show wall-related profile changes and low-frequency tails. Symmetry mode analysis is used to describe the displacive modes characterizing the structural distortion in lead phosphate-arsenate for the sequence K m → P21/c. |
| Keywords: | Lead phosphate-arsenate Atomic force microscopy Ferroelastic domains Raman spectroscopy |