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Phase transitions in Pb 8 O 5 (XO 4 ) 2 (X = As and V) compounds
Author(s) -
Oliveira E. A.,
Silva E. N.,
Paschoal A. R.,
Dantas S. M.,
Guedes I.,
MendesFilho J.,
Polla G.,
Ayala A. P.
Publication year - 2011
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.2886
Subject(s) - raman spectroscopy , phase transition , crystallography , analytical chemistry (journal) , phase (matter) , chemistry , order (exchange) , spectroscopy , oxide , x ray crystallography , materials science , mineralogy , diffraction , physics , condensed matter physics , optics , organic chemistry , finance , quantum mechanics , economics , chromatography
Raman spectroscopy, polarized microscopy and thermal measurements were used to investigate the sequence of phase transition in the lead oxide salts Pb 8 O 5 (XO 4 ) 2 (where X = As and V). For Pb 8 O 5 (AsO 4 ) 2 , a second‐order phase transition is observed at 500 K. For Pb 8 O 5 (VO 4 ) 2 , a second‐order and a first‐order structural phase transitions are observed at 425 and 525 K, respectively. The ferroelastic character of Pb 8 O 5 (VO 4 ) 2 is also discussed. Copyright © 2011 John Wiley & Sons, Ltd.