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Synthesis of Vanadate and Arsenate Spodiosites and Interpretation of Optical Spectra of Manganese‐Doped Sr 2 VO 4 C1
Author(s) -
NATH D. K.,
HUMMEL F. A.
Publication year - 1969
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1969.tb12650.x
Subject(s) - vanadate , arsenate , vanadium , barium , manganese , chemistry , strontium , inorganic chemistry , chromium , analytical chemistry (journal) , arsenic , organic chemistry , chromatography
New vanadate and arsenate analogs of spodiosite (Sr 2 ‐(VO 4 )C1 and Sr 2 (AsO 4 )C1) were prepared. Isomorphism between chromium and vanadium spodiosites was established by formation of complete solid solutions. The vanadate analogs of calcium and barium, the arsenate analog of calcium, phosphate analogs of strontium and barium, and the fluorine analogs, Ca 3 (VO 4 ) 2 ·CaF 2 and Sr 3 (VO 4 ) 2 ·SrF 2 , could not be synthesized. The optical absorption spectra of manganese‐doped Sr 2 (VO 4 )Cl showed the presence of Mn 5+ in the vanadium position, the site symmetry being approximately Td . Three transitions, 3 T 2 ( F ), 3 T 1 ( F ), and 1 A l ( G ) at (12,000 and 13,000 cm ‐1 ), (16,700 cm ‐1 ), and (14,300 cm ‐1 ), respectively, were observed from the ground state, 3 A 2 ( F ). The lower symmetry components were strong enough to split the energy level, 3 T 2 ( F ). The crystal field parameter Dq and the Racah parameters B and C were calculated to be 1200, 470, and 1927 cm ‐1 , respectively.