Journal ArticleDOI
Investigation of the structure of the relaxor ferroelectric Pb(Fe1/2Nb1/2)O3 by neutron powder diffraction
TLDR
In this article, a straightforward unit cell of symmetry R 3m was obtained for the 300 K structure, with the same symmetry and a similar unit cell also obtained at low temperature, in order to assign non-zero magnetic moments to the iron ions, these being in a collinear, antiferromagnetic alignment This magnetic structure can be described with reference to doubled unit cell axes.Abstract:
The complex perovskite lead iron niobate, Pb(Fe1/2 Nb1/2 )O3 (PFN), has been studied by neutron powder diffraction Following collection of diffraction data at 300 K and at 10 K, structural refinements have been carried out by means of the Rietveld method As expected, a straightforward unit cell of symmetry R 3m was obtained for the 300 K structure, with the same symmetry and a similar unit cell also obtained at low temperature Furthermore, in order to obtain a good agreement with experiment at 10 K, it was necessary to assign non-zero magnetic moments to the iron ions, these being in a collinear, antiferromagnetic alignment This magnetic structure can be described with reference to doubled unit cell axes The factors governing the observed structures of PFN are discussed by comparison with the related system of Pb(Mg1/3 Nb2/3 )O3 read more
Citations
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Frequency-temperature response of ferroelectromagnetic Pb(Fe1∕2Nb1∕2)O3 ceramics obtained by different precursors. Part I. Structural and thermo-electrical characterization
TL;DR: In this paper, the presence of Fe2+, detrimental to the ferroelectric and magnetic performance, was evaluated by x-ray photoelectron spectroscopy, showing no structural differences, uniformly distributed grains, a ferro-paraelectric transition temperature at 110°C and a normal diffuse phase transition (nonrelaxor behavior).
Journal ArticleDOI
Structural and dielectric studies of BaFe0.5Nb0.5O3
Sonali Saha,T.P. Sinha +1 more
TL;DR: In this paper, the authors show that BaFe 0.5Nb0.5O3 (BFN) is a relaxor ferroelectric and that the real and imaginary parts of the dielectric permittivity with frequency have been performed assuming a distribution of relaxation times as confirmed by Cole-Cole plots.
Journal ArticleDOI
Magnetoelectric coupling in ferroelectromagnet Pb ( Fe 1 ∕ 2 Nb 1 ∕ 2 ) O 3 single crystals
TL;DR: In this paper, the magnetic and dielectric properties of Pb(Fe 1/2Nb1/2)O-3 (PFN) single crystals have been investigated.
Journal ArticleDOI
Phase transitions of Pb(ZrxTi1-x)O3 ceramics
Johannes Frantti,Stefan Ivanov,S.-G. Eriksson,Håkan Rundlöf,Vilho Lantto,Jyrki Lappalainen,Masato Kakihana +6 more
TL;DR: In this article, the structure of lead zirconate titanate (PZT) ceramics with compositions in the vicinity of the morphotropic phase boundary is discussed.
Journal ArticleDOI
Random fields in relaxor ferroelectrics — a jubilee review
TL;DR: In this article, the coexistence of distinct normal and relaxor ferroelectric phases within the framework of percolation theory has been studied, and it has been shown that a strong frequency dispersion of the dielectric response and an apparent lack of macroscopic symmetry breaking in the low temperature phase are related to mesoscopic RF-driven phase transitions, which give rise to irregularly shaped quasi-stable polar nanoregions below the characteristic temperature T*, but above the global transition temperature Tc.
References
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Journal ArticleDOI
Recent advances in magnetic structure determination by neutron powder diffraction
TL;DR: In this article, the main formulas governing the analysis of the Bragg magnetic scattering are summarized and shortly discussed and the method of profile fitting without a structural model to get precise integrated intensities and refine the propagation vector(s) of the magnetic structure is discussed.
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Neutron scattering lengths and cross sections
TL;DR: The application of thermal neutron scattering to the study of the structure and dynamics of condensed matter requires a knowledge of the scattering lengths and the corresponding scattering and absorption cross sections of the elements as discussed by the authors.
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Phase transitions in disordered lead iron niobate: X-ray and synchrotron radiation diffraction experiments
TL;DR: In this paper, the symmetry of the phases in disordered perovskite has been investigated using X-ray and synchrotron radiation, showing that the compound is a monoclinic ferroelectric at 293 K, undergoes a structural transition to another tetragonal state at about 355 K and finally transforms into a cubic form at approximately 376 K.
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A modified two-Stage mixed oxide synthetic route to lead magnesium niobate and lead iron niobate
Supon Ananta,Noel W. Thomas +1 more
TL;DR: In this article, a modified mixed oxide synthetic route has been developed for the synthesis of lead magnesium niobate [Pb(Mg1/3Nb2/3)O3; PMN] and lead iron Niobate[Pb[Fe1/2Nb1/ 2]O3]; PFN] powders.
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Relationships between sintering conditions, microstructure and dielectric properties of lead magnesium niobate
Supon Ananta,Noel W. Thomas +1 more
TL;DR: In this paper, a method has been developed whereby volatilisation of PbO can be minimised, thereby avoiding the formation of pyrochlore phases and maximising the perovskite yield.