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  Elastic and anelastic relaxation behaviour of perovskite multiferroics I: PbZr0.53Ti0.47O3 (PZT)-PbFe0.5Nb0.5O3 (PFN)

Schiemer, J. A., Lascu, I., Harrison, R. J., Kumar, A., Katiyar, R. S., Sanchez, D. A., et al. (2016). Elastic and anelastic relaxation behaviour of perovskite multiferroics I: PbZr0.53Ti0.47O3 (PZT)-PbFe0.5Nb0.5O3 (PFN). Journal of Materials Science, 51(24), 10727-10760. doi:10.1007/s10853-016-0280-2.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-B9E4-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-2938-3
Genre: Journal Article

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 Creators:
Schiemer, J. A.1, Author
Lascu, I.1, Author
Harrison, R. J.1, Author
Kumar, A.1, Author
Katiyar, R. S.1, Author
Sanchez, D. A.1, Author
Ortega, N.1, Author
Salazar Mejía, C.2, Author              
Schnelle, W.3, Author              
Shinohara, H.1, Author
Heap, A. J. F.1, Author
Nagaratnam, R.1, Author
Dutton, S. E.1, Author
Scott, J. F.1, Author
Carpenter, M. A.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
3Walter Schnelle, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863441              

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 Abstract: Perovskites in the ternary system PbTiO3 (PT)-PbZrO3 (PZ)-Pb(Fe0.5Nb0.5)O-3 (PFN) have attracted close interest because they can display simultaneous ferroelectric, magnetic and ferroelastic properties. Those with the most sensitive response to external fields are likely to have compositions near the morphotropic phase boundary (MPB) which lies close to the binary join Pb(Zr0.53Ti0.47)O-3 (PZT)-PFN. In the present study, the strength and dynamics of strain coupling behaviour which accompanies the development of ferroelectricity and (anti)ferromagnetism in ceramic PZT-PFN samples have been investigated by resonant ultrasound spectroscopy. Elastic softening ahead of the cubic-tetragonal transition does not fit with models based on dispersion of the soft mode or relaxor characteristics but is attributed, instead, to coupling between acoustic modes and a central peak mode from correlated relaxations and/or microstructure dynamics. Softening of the shear modulus through the transition by up to similar to 50 % fits with the expected pattern for linear/quadratic strain/order parameter coupling at an improper ferroelastic transition and close to tricritical evolution for the order parameter. Superattenuation of acoustic resonances in a temperature interval of similar to 100 K below the transition point is indicative of mobile ferroelastic twin walls. By way of contrast, the first-order tetragonal-monoclinic transition involves only a small change in the shear modulus and is not accompanied by significant changes in acoustic dissipation. The dominant feature of the elastic and anelastic properties at low temperatures is a concave-up variation of the shear modulus and relatively high loss down to the lowest temperature, which appears to be the signature of materials with substantial local strain heterogeneity and a spectrum of strain relaxation times. No evidence of magnetoelastic coupling has been found, in spite of the samples displaying ferromagnetism below similar to 550 K and possible spin glass ordering below similar to 50 K. For the important multiferroic perovskite ceramics with compositions close to the MPB of ternary PT-PZ-PFN, there must be some focus in future on the role of strain heterogeneity.

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Language(s): eng - English
 Dates: 2016-09-082016-09-08
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: 000385410400005
DOI: 10.1007/s10853-016-0280-2
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Title: Journal of Materials Science
  Abbreviation : JMS
Source Genre: Journal
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Publ. Info: New York, NY, USA : Springer
Pages: - Volume / Issue: 51 (24) Sequence Number: - Start / End Page: 10727 - 10760 Identifier: ISSN: 0022-2461
CoNE: https://pure.mpg.de/cone/journals/resource/954925415936_1