Investigation of the influence of gradual substitution K ↔ Rb on the structure and phase transition in K x Rb1 - x Pb2Br5 solid solutions
Abstract
Single crystals of K x Rb1 - x Pb2Br5 solid solutions have been grown and investigated using X-ray diffraction and polarized light microscopy in the temperature range 270-640 K. The regions of existence of the tetragonal ( I4/ mcm) and monoclinic ( P21/ c) phases have been determined. It has been demonstrated that the partial introduction of rubidium into KPb2Br5 leads to an increase in the temperature of the ferroelastic phase transition ( P21/ c↔ mmm), so that it approaches the melting temperature. In the solid solutions with x ≈ 0.4-0.5, the temperature region of existence of the orthorhombic phase is narrowed to ≈ 1-2 K. It has been revealed that an increase in the potassium content in the material results in a considerable increase in the incorporation coefficient of Er3+ ions.
- Publication:
-
Physics of the Solid State
- Pub Date:
- March 2009
- DOI:
- 10.1134/S1063783409030251
- Bibcode:
- 2009PhSS...51..589I
- Keywords:
-
- 61.50.Ks;
- 61.72.Mm