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Radiation Damage of Ni 2+ ‐Doped NH 4 MgPO 4 · 6 H 2 O
Author(s) -
Chowdari B. V. R.,
Ravisekhar Y.,
Muralikrishna C.
Publication year - 1982
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.2221090134
Subject(s) - analytical chemistry (journal) , doping , paramagnetism , absorption (acoustics) , irradiation , ion , anisotropy , materials science , absorption spectroscopy , center (category theory) , radiation damage , radical , crystallography , chemistry , optics , physics , condensed matter physics , optoelectronics , organic chemistry , chromatography , nuclear physics , composite material
Abstract An optical absorption study of NH 4 MgPO 4 · 6 H 2 O doped with Ni 2+ shows that Ni 2+ substitutes for Mg 2+ in the lattice. This spectrum is fitted to the Liehr and Ballhausen scheme for a 3d 8 ion in O h surroundings. A correlated ESR and optical absorption study of these crystals on X‐ or γ‐irradiation at room temperature indicates the formation of Ni 3+ and NH 3 + radicals. The NH 3 + center is found to have an isotropic g and A H and an anisotropic A N . This center is also produced in undoped crystals with lower yield. Ni 3+ centers are found to be paramagnetic and exhibit their characteristic optical absorption bands.