Investigations of Defect Centres in Alkali Halides Doped with Trivalent Cations. Part 1: Bismuth in NaCl, KCl and RbCl Crystals |
| M. Suszyńska W. Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Pl. Katedralny 1, 50-950 Wrocław, Poland and R. Capelletti Physics Department, Parma University, 43100 Parma, Italy |
| Dedicated to Professor Dr. Julian Auleytner on the occasion of his 70th birthday |
| Received: July 9, 1992 |
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| A correlated set of experiments was performed with a view to study the effect of trivalent bismuth upon some properties of NaCl, KCI and RbCI crystals. For NaCI the effect of BiO+ ions was also investigated. It was stated that: 1. The hydrolytic properties of bismuth are responsible for the formation of BiO+ centres also in crystals doped with BP3+ ions. 2. During all experiments performed, the dopant remains in the form of trivalent cations. 3. Optical absorption spectra of bismuth are similar to those characteristic of other heavy metal ions with the s2 electronic configuration. 4. The charge excess of BP3+ ions is compensated by cation vacancies whereas for BiO+ ions the preferential bonding between Bi3+ and O2- serves for the charge compensation. |
| DOI: 10.12693/APhysPolA.83.25 PACS numbers: 77.40.+i |