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Ultramarine study by EPR
Author(s) -
Więckowski A.
Publication year - 1970
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.19700420112
Subject(s) - electron paramagnetic resonance , ion , lattice (music) , lattice constant , chemistry , condensed matter physics , line width , radical , physics , nuclear magnetic resonance , optics , diffraction , organic chemistry , acoustics
By EPR, ion‐radicals ˙ S − , ˙ S 2 − , and ˙ S 3 −are found to arise in the process of synthesizing ultramarine. Typical, blue ultramarine contains ˙ S 3 −ions. At room temperature, the line width is found to be determined to a large extent by spin–lattice interaction, whereas at liquid nitrogen temperature (77° K) almost exclusively by spin–spin interaction. The EPR line shape was analyzed by linear anamorphosis of the resonance curve. The second moment was used for computing the density of polysulfide ions ˙ S 3 −according to Van Vleck's formula. The results indicate that the ˙ S 3 −radicals form a face centred cubic lattice in an elementary cell with lattice constant d ′ = 2 d = 18.12 Å, where d is the lattice constant of the elementary cell determined by the X‐ray method.