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EPR investigation of Gd 3+ and Eu 2+ in the α‐ and β‐phases of lead phosphate
Author(s) -
Razeghi M.,
Buisson J. P.,
Houlier B.
Publication year - 1979
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.2220950133
Subject(s) - electron paramagnetic resonance , zeeman effect , spectral line , ion , zeeman energy , phosphate , phase transition , phase (matter) , materials science , chemistry , analytical chemistry (journal) , nuclear magnetic resonance , condensed matter physics , magnetic field , physics , organic chemistry , quantum mechanics , astronomy , chromatography
The X‐band EPR spectra of Gd 3+ and Eu 2+ diluted in Pb 3 (PO 4 ) 2 crystals are studied. Lead phosphate exhibits a ferroelastic phase transition at 180°C and the EPR spectra obtained in each phase differ from each other. The spectra are very complex because the zero field splitting has the same order of magnitude as the Zeeman term. The spin Hamiltonian parameters and the energy levels are computed. “Forbidden” or “missing” transitions and line intensities can be explained. Very likely Gd 3+ substitute a Pb I ion. For Gd 3+ in β‐phase g ≈ 2 and b 2 0= 990 × × 10 −4 cm −1 (200°C); for Gd 3+ in α‐phase at 25°C g ≈ 2, b 2 0= 930 × 10 −4 cm −1 and b 2 2= −77 × × 10 −4 cm −1 .