Premium
Structural and Optical Properties of the System (Ca, Sr, Eu) 5 (PO 4 ) 3 CI
Author(s) -
Nötzold D.,
Wulff H.,
Herzog G.
Publication year - 1995
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221910103
Subject(s) - luminescence , alkaline earth metal , crystallite , rietveld refinement , ion , crystal structure , hexagonal crystal system , analytical chemistry (journal) , lattice constant , crystallography , chemistry , diffraction , materials science , mineralogy , physics , alkali metal , optics , chromatography , optoelectronics , organic chemistry
Polycrystalline materials of the composition Sr 5− x − y Ca x Eu y (PO 4 ) 3 Cl with 0 ≦ x ≦ 4.99 and 0 ≦ y ≦ 0.1 crystallize in the hexagonal crystal system. The space group is P6 3 /m. The alkaline earth ions occupy two different crystallographical sites. In addition to X‐ray diffraction measurements, the optical properties are studied at room temperature. Moreover the emission spectra are measured at liquid nitrogen temperature. Refinement of the structure parameters is carried out using the Rietveld method. A varying calcium portion influences the lattice constants a 0 and c 0 and therefore the luminescence of the samples. The luminescence arises from transitions between 4f 6 5d and 4f 7 configurations of the Eu 2+ ion.