The possibility that the optical second-harmonic generation in lead phosphate, Pb<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>, is related to structural imperfections
T Bleser; B Berge; U Bismayer; E K H Salje; T Bleser; Dept. of Earth Sci., Cambridge Univ., UK; B Berge; Dept. of Earth Sci., Cambridge Univ., UK; U Bismayer; Dept. of Earth Sci., Cambridge Univ., UK; E K H Salje; Dept. of Earth Sci., Cambridge Univ., UK
Журнал:
Journal of Physics: Condensed Matter
Дата:
1994-03-07
Аннотация:
The second-harmonic generation (SHG) of nominally pure lead phosphate Pb<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>, was reinvestigated. SHG is confirmed at room temperature albeit with a large spatial variation within each sample. The signal did not disappear when the crystal was heated well above the ferroelastic transition temperature of 453 K. Chemical analysis using X-ray microprobe techniques showed a weak oxygen deficit for all samples. It is suggested that SHG is not necessarily indicative of an intrinsic symmetry breaking process in Pb<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub> but may be related to structural imperfections.
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