| Автор | F Ermark |
| Автор | B Topic |
| Автор | U Haeberlen |
| Автор | R Blinc |
| Дата выпуска | 1989-08-14 |
| dc.description | The <sup>31</sup>P chemical shift tensors were measured in the paraelectric (P) and ferroelectric (F) phases of PbHPO<sub>4</sub>. They reflect the approximate C<sub>2v</sub> and C<sub>3</sub> point symmetries of the <sup>31</sup>P sites in the P and F phases of the crystal. The transition from C<sub>2v</sub> to C<sub>3</sub> is the result of a proton ordering in double-well potentials below the phase transition temperature. In the P phase the width of the proton decoupled <sup>31</sup>P-resonances is larger than in the F phase, and the orientation dependence of the excess width is clearly correlated with that of the <sup>31</sup>P line splittings in the F phase. This finding is interpreted as giving evidence that the Pc-space-group symmetry of the F phase persists in the P phase. The authors believe that this is due to the presence of a homogeneous internal biasing field-produced by oriented defects with a nonzero charge and dipole moment-which breaks the symmetry of the high temperature phase in a similar way to an external electric field. The orientation of these defects is due to the fact that the crystal was grown in the ferroelectric phase. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | <sup>31</sup>P NMR study of the ferroelectric phase transition in PbHPO<sub>4</sub> |
| Тип | paper |
| DOI | 10.1088/0953-8984/1/32/018 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 1 |
| Первая страница | 5489 |
| Последняя страница | 5496 |
| Аффилиация | F Ermark; Arbeitsgruppe Molekulkristalle, Max-Planck-Inst. Medizinische Forschung, Heidelberg, West Germany |
| Аффилиация | B Topic; Arbeitsgruppe Molekulkristalle, Max-Planck-Inst. Medizinische Forschung, Heidelberg, West Germany |
| Аффилиация | U Haeberlen; Arbeitsgruppe Molekulkristalle, Max-Planck-Inst. Medizinische Forschung, Heidelberg, West Germany |
| Аффилиация | R Blinc; Arbeitsgruppe Molekulkristalle, Max-Planck-Inst. Medizinische Forschung, Heidelberg, West Germany |
| Выпуск | 32 |
