DocumentCode
1287263
Title
Dielectric and Mossbauer studies of ferroelectric and magnetic phase transitions in a-site and b-site substituted multiferroic PbFe0.5Nb0.5O3
Author
Raevski, Igor P. ; Kubrin, Stanislav P. ; Raevskaya, Svetlana I. ; Prosandeev, Sergey A. ; Malitskaya, Maria A. ; Titov, Victor V. ; Sarychev, Dmitry A. ; Blazhevich, Aleksei V. ; Zakharchenko, Irina N.
Author_Institution
Res. Inst. of Phys., Southern Fed. Univ., Rostov on Don, Russia
Volume
59
Issue
9
fYear
2012
fDate
9/1/2012 12:00:00 AM
Firstpage
1872
Lastpage
1878
Abstract
In the present study, we diluted either A- or B- sublattice of perovskite multiferroic PbFe0.5Nb0.5O3 (PFN) and studied the changes of the magnetic and ferroelectric phase transition temperatures and dielectric properties caused by such dilution. Dielectric studies of PFN single crystals show that, in contrast to the commonly adopted view, the ferroelectric phase transition in PFN is non-diffused and the relaxor-like behavior usually observed in ceramic samples has an extrinsic nature. A-site substitutions (Ba, Ca) lead to the smearing of the permittivity-temperature maximum, lowering its maximum temperature, Tm and inducing relaxor behavior. B-site diluting of PFN by Ti increases Tm and only slightly affects the permittivity maximum diffuseness. Both A-site and B-site substitutions in PFN lead to lowering of its Neel temperature, TN. However, above a certain compositional threshold, fast lowering of TN stops and a new magnetic state with comparatively high (~50K) transition temperature becomes stable in a rather wide compositional range.
Keywords
Mossbauer effect; Neel temperature; ferroelectric ceramics; ferroelectric transitions; lead compounds; multiferroics; permittivity; relaxor ferroelectrics; A-site substitutions; B-site substitution; Mossbauer spectroscopy; Neel temperature lowering; PFN B-site dilution; PFN single crystals; PbFe0.5Nb0.5O3; a-site substituted multiferroic PFN; b-site substituted multiferroic PFN; ceramic; compositional threshold; dielectric properties; extrinsic nature; ferroelectric phase transition temperature; magnetic phase transition temperature; magnetic state; permittivity-temperature maximum smearing; perovskite multiferroic PFN A-sublattice; perovskite multiferroic PFN B-sublattice; relaxor-like behavior; Ceramics; Crystals; Dielectrics; Ions; Magnetoelectric effects; Solids; Temperature;
fLanguage
English
Journal_Title
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
Publisher
ieee
ISSN
0885-3010
Type
jour
DOI
10.1109/TUFFC.2012.2399
Filename
6306001
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