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Negative thermal expansion in the PbTi 1– x Fe x O 3 system
Author(s) -
Sun Ce,
Cao Zhanmin,
Chen Jun,
Yu Ranbo,
Sun Xueyi,
Hu Penghao,
Liu Guirong,
Xing Xianran
Publication year - 2008
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.200880265
Subject(s) - thermal expansion , curie temperature , analytical chemistry (journal) , tetragonal crystal system , raman spectroscopy , materials science , atmospheric temperature range , negative thermal expansion , multiferroics , crystallography , condensed matter physics , chemistry , ferromagnetism , crystal structure , metallurgy , dielectric , ferroelectricity , physics , thermodynamics , optics , optoelectronics , chromatography
Multiferroic magnetoelectric PbTi 1– x Fe x O 3 compounds were prepared using a solid‐state reaction method in the composition range 0 ≤ x ≤ 0.15. The temperature dependence of lattice parameters of PbTi 1– x Fe x O 3 was determined from high‐temperature X‐ray diffraction. The average volumetric thermal expansion coefficient of the tetragonal phase increases from –1.99 × 10 –5 °C –1 for PbTiO 3 to –1.13 × 10 –5 °C –1 for PbTi 0.90 Fe 0.10 O 3 . The negative thermal expansion and the Curie temperature ( T C ) of PbTiO 3 are reduced by the introduction of Fe. Raman spectral measurements show a softening behaviour for A 1 (1TO) and A 1 (2TO) of PbTi 1– x Fe x O 3 with increasing Fe concentration, which means that the decrease in both T C and c / a is due to the reduced spontaneous polarization. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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