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B‐site Dopant Effect on the Thermal Expansion in the (1‐ x )PbTiO 3 ‐ x BiMeO 3 Solid Solution ( Me = Fe , In , Sc )
Author(s) -
Hu Penghao,
Chen Jun,
Sun Ce,
Deng Jinxia,
Xing Xianran
Publication year - 2011
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.1551-2916.2011.04632.x
Subject(s) - thermal expansion , curie temperature , dopant , solid solution , raman spectroscopy , materials science , condensed matter physics , crystal structure , analytical chemistry (journal) , diffraction , crystallography , doping , mineralogy , chemistry , physics , optics , ferromagnetism , composite material , chromatography , metallurgy
The (1‐ x ) PbTiO 3 ‐ x BiMeO 3 (Me = Fe, In, Sc) solid solutions were prepared and investigated using high‐temperature X‐ray diffraction for the B‐site dopant effect on their thermal expansion behaviors. Compared with PbTiO 3 , the negative thermal expansion of (1‐ x ) PbTiO 3 ‐ x BiFeO 3 was enhanced, whereas that of (1‐ x ) PbTiO 3 ‐ x BiInO 3 was a little weakened and was much weakened in (1‐ x ) PbTiO 3 ‐ x BiScO 3 . An empirical linear correlation between the average effective radius of the B‐site cations and the unit cell volumes at Curie point of the solid solutions was concluded. The relationship was also observed in other PbTiO 3 ‐BiMeO 3 ‐type solid solutions and was supposed to be widely useful in predicting the thermal expansion coefficient of compounds of this sort. Above the Curie point, the unit cell volumes of the compounds were determined by the radii of the doped B‐site cations. The weaking and vanishing of the lattice distortion caused by spontaneous polarization displacements was proved by Raman scatting spectrum, which supported the relationship in the lattice dynamic aspect.