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Radiation Damage Studies of Co 2+ and Ni 2+ Doped NH 4 Cl Crystals
Author(s) -
Rambau B.,
Ramasastry C.,
Chowdari B. V. R.
Publication year - 1983
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.2221180144
Subject(s) - irradiation , impurity , doping , absorption (acoustics) , crystal (programming language) , radiation damage , crystallography , analytical chemistry (journal) , absorption spectroscopy , chemistry , materials science , inorganic chemistry , physics , optics , chromatography , optoelectronics , organic chemistry , computer science , nuclear physics , composite material , programming language
Results from the radiation damage studies of NH 4 Cl:Co 2+ and NH 4 Cl:Ni 2+ crystals are presented. On X‐irradiation at room temperature the NH 4 Cl:Co 2+ crystals are found to absorb at 270, 345, 585, 900, and 1000 nm. These absorption bands are attributed to the charge transfer transitions between radiation induced hydrazine‐like defect, N 2 H 4 + , and ligands H 2 O or NH 3 which are made available in the crystal along with the divalent impurity. If not all the absorption bands but similar absorption is found on irradiation in Ni 2+ doped NH 4 Cl crystals also. ESR studies of X‐rayed Ni 2+ doped NH 4 Cl crystals reveal the formation of both, Ni + and Ni 3+ . Spin‐Hamiltonian parameters for these centers are given.