| Автор | S C Jain |
| Автор | K S K Sai |
| Автор | K Lal |
| Дата выпуска | 1971-10-07 |
| dc.description | Dielectric loss measurements show only one loss peak at a frequency f<sub>m</sub> at any fixed temperature in the range 80 degrees to 150 degrees C. The values of f<sub>0</sub> and E in the equation f<sub>m</sub>=f<sub>0</sub>exp(-E/kT) are determined for lead doped KCl, KBr and KI crystals. The electrical conductivity measurements give the values 0.4 eV (KCl), 0.3 eV (KBr) and 0.4 eV (KI) for the energy of association of Pb<sup>2+</sup> with a cation vacancy. On colouring the crystals, the dielectric loss peak disappears, the electrical conductivity decreases and new optical bands in the range of 240 to 300 nm are obtained. These results are attributed to the conversion of Pb<sup>2+</sup> ions to Pb<sup>+</sup> ions on coloration. On heating the KCl:Pb coloured crystals to a temperature in the range 300 degrees -500 degrees C, Pb<sup>+</sup> changes to Pb<sup>0</sup>. On heating the crystals to higher temperatures, Pb colloidal particles are formed. Pb<sup>0</sup> centres give rise to an absorption band at 214 nm and Pb colloidal particles, one at 240 nm. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Dielectric loss, optical absorption spectra and electrical conductivity of lead doped alkali halides |
| Тип | paper |
| DOI | 10.1088/0022-3719/4/14/010 |
| Print ISSN | 0022-3719 |
| Журнал | Journal of Physics C: Solid State Physics |
| Том | 4 |
| Первая страница | 1958 |
| Последняя страница | 1962 |
| Аффилиация | S C Jain; Solid State Phys. Lab., Delhi, India |
| Аффилиация | K S K Sai; Solid State Phys. Lab., Delhi, India |
| Аффилиация | K Lal; Solid State Phys. Lab., Delhi, India |
| Выпуск | 14 |
