Crystalline field parameters of Cr2+ and Cr4+ in corundum
Creators
- 1. Paris-11 Univ., 91 - Orsay (France). Inst. d'Electronique Fondamentale
Description
The main purpose of this paper is to evaluate the crystalline field parameters (B, C, Dq, v, v') of the Cr2+(3d4) and Cr4+(3d2) ions in corundum, The lack of experimental data and the failure of calculations based on the conventional crystal model led to an indirect determination. The published optical data for the 3dsup(n) ions in the αAl2O3 lattice that is known with sufficient accuracy is discussed. From these results the variation of the parameters is obtained as a function of the electronic charge within the electronic series and the optical parameter values of the Cr4+(3d2) and Cr2+(3d4) in the same lattice are evaluated. The additional absorption bands in irradiated ruby are discussed. The trigonal field parameters of V3+ and Cr4+ ions are shown to be in good agreement with the ground state splitting of both ions
Abstract (French)
L'objectif principal de cet article est l'evaluation des parametres de champ cristallin (B, C, Dq, v,v') pour les ions Cr2+(3d4) et Cr4+(3d2) dans le corindon. L'absence de donnees experimentales et les resultats mediocres obtenus avec le modele de champ cristallin utilise de facon conventionnelle ont conduit a en effectuer une determination indirecte. En premier lieu, parmi les resultats optiques publies qui concernent les ions 3dsup(n) dans le reseau cristallin d'αAl2O3 ceux ayant des donnees optiques connues avec une precision suffisante ont ete selectionnes ou discutes si necessaire. A partir de ces resultats la variation des parametres optiques pour des series d'ions isoelectroniques a ete deduite; les parametres optiques des ions Cr4(3d2) et Cr2+(3d4) dans le mem reseau cristallin ont alors ete evalues. L'appartenance des bandes additionnelles du rubis irradie est discutee. Il est egalement montre que les valeurs obtenues des parametres du champ trigonal des ions V3+ et Cr4+ expliquent de facon satisfaisante la separation en energie de l'etat fondamental de ces deux ionsAdditional details
Identifiers
Publishing Information
- Journal Title
- Journal de Physique
- Journal Volume
- 37
- Journal Issue
- 5
- Series
- J. Phys. (Paris).
- Journal Page Range
- 603-610
- ISSN
- 0302-0738
INIS
- Country of Publication
- France
- Country of Input or Organization
- France
- INIS RN
- 7269637
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
- Descriptors DEI
- CHROMIUM IONS; COLOR CENTERS; CRYSTAL FIELD; ENERGY LEVELS; PHYSICAL RADIATION EFFECTS; RUBY
- Descriptors DEC
- ALUMINIUM COMPOUNDS; ALUMINIUM OXIDES; ATOMIC IONS; CHALCOGENIDES; CHARGED PARTICLES; CORUNDUM; CRYSTAL DEFECTS; CRYSTAL STRUCTURE; IONS; MINERALS; OXIDES; OXYGEN COMPOUNDS; POINT DEFECTS; RADIATION EFFECTS; VACANCIES
Optional Information
- Notes
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