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Carpenter MA, Schiemer JA, Lascu I, Harrison RJ, Kumar A, Katiyar RS, Ortega N, Sanchez DA, Mejia CS, Schnelle W, Echizen M, Shinohara H, Heap AJF, Nagaratnam R, Dutton SE, Scott JF. Elastic and magnetoelastic relaxation behaviour of multiferroic (ferromagnetic + ferroelectric + ferroelastic) Pb(Fe0.5Nb0.5)O3 perovskite. J Phys Condens Matter 2015; 27:285901. [PMID: 26125192 DOI: 10.1088/0953-8984/27/28/285901] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Resonant Ultrasound Spectroscopy has been used to characterize elastic and anelastic anomalies in a polycrystalline sample of multiferroic Pb(Fe(0.5)Nb(0.5))O(3) (PFN). Elastic softening begins at ~550 K, which is close to the Burns temperature marking the development of dynamical polar nanoregions. A small increase in acoustic loss at ~425 K coincides with the value of T(*) reported for polar nanoregions starting to acquire a static or quasi-static component. Softening of the shear modulus by ~30-35% through ~395-320 K, together with a peak in acoustic loss, is due to classical strain/order parameter coupling through the cubic → tetragonal → monoclinic transition sequence of ferroelectric/ferroelastic transitions. A plateau of high acoustic loss below ~320 K is due to the mobility under stress of a ferroelastic microstructure but, instead of the typical effects of freezing of twin wall motion at some low temperature, there is a steady decrease in loss and increase in elastic stiffness below ~85 K. This is attributed to freezing of a succession of strain-coupled defects with a range of relaxation times and is consistent with a report in the literature that PFN develops a tweed microstructure over a wide temperature interval. No overt anomaly was observed near the expected Néel point, ~145 K, consistent with weak/absent spin/lattice coupling but heat capacity measurements showed that the antiferromagnetic transition is actually smeared out or suppressed. Instead, the sample is weakly ferromagnetic up to ~560 K, though it has not been possible to exclude definitively the possibility that this could be due to some magnetic impurity. Overall, evidence from the RUS data is of a permeating influence of static and dynamic strain relaxation effects which are attributed to local strain heterogeneity on a mesoscopic length scale. These, in turn, must have a role in determining the magnetic properties and multiferroic character of PFN.
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Affiliation(s)
- M A Carpenter
- Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK
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Lashley JC, Munns JHD, Echizen M, Ali MN, Rowley SE, Scott JF. Phase transitions in the brominated ferroelectric tris-sarcosine calcium chloride. Adv Mater 2014; 26:3860-3866. [PMID: 24789107 DOI: 10.1002/adma.201305065] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Revised: 02/24/2014] [Indexed: 06/03/2023]
Affiliation(s)
- J C Lashley
- Los Alamos National Laboratory, Los Alamos, New Mexico 1663, 87545, USA; Cavendish Laboratory, Cambridge University, J. J. Thomson Avenue, Cambridge, CB3 0HE, England
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Schiemer J, Carpenter MA, Evans DM, Gregg JM, Schilling A, Arredondo M, Alexe M, Sanchez D, Ortega N, Katiyar RS, Echizen M, Colliver E, Dutton S, Scott JF. Studies of the Room-Temperature Multiferroic Pb(Fe 0.5Ta 0.5) 0.4(Zr 0.53Ti 0.47) 0.6O 3: Resonant Ultrasound Spectroscopy, Dielectric, and Magnetic Phenomena. Adv Funct Mater 2014; 24:2993-3002. [PMID: 25844085 PMCID: PMC4379905 DOI: 10.1002/adfm.201303492] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/11/2013] [Revised: 11/28/2013] [Indexed: 06/04/2023]
Abstract
Recently, lead iron tantalate/lead zirconium titanate (PZTFT) was demonstrated to possess large, but unreliable, magnetoelectric coupling at room temperature. Such large coupling would be desirable for device applications but reproducibility would also be critical. To better understand the coupling, the properties of all 3 ferroic order parameters, elastic, electric, and magnetic, believed to be present in the material across a range of temperatures, are investigated. In high temperature elastic data, an anomaly is observed at the orthorhombic mm2 to tetragonal 4mm transition, Tot = 475 K, and a softening trend is observed as the temperature is increased toward 1300 K, where the material is known to become cubic. Thermal degradation makes it impossible to measure elastic behavior up to this temperature, however. In the low temperature region, there are elastic anomalies near ≈40 K and in the range 160-245 K. The former is interpreted as being due to a magnetic ordering transition and the latter is interpreted as a hysteretic regime of mixed rhombohedral and orthorhombic structures. Electrical and magnetic data collected below room temperature show anomalies at remarkably similar temperature ranges to the elastic data. These observations are used to suggest that the three order parameters in PZTFT are strongly coupled.
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Affiliation(s)
- J Schiemer
- Department of Earth Sciences, University of CambridgeCambridge, CB2 0EQ, UK
| | - M A Carpenter
- Department of Earth Sciences, University of CambridgeCambridge, CB2 0EQ, UK
| | - D M Evans
- School of Mathematics & Physics, Queen's University of BelfastBelfast, BT7 1NN, UK
| | - J M Gregg
- School of Mathematics & Physics, Queen's University of BelfastBelfast, BT7 1NN, UK
| | - A Schilling
- School of Mathematics & Physics, Queen's University of BelfastBelfast, BT7 1NN, UK
| | - M Arredondo
- School of Mathematics & Physics, Queen's University of BelfastBelfast, BT7 1NN, UK
| | - M Alexe
- Max Planck Institute of Microstructure PhysicsWeinberg 2, 06120, Halle (Saale), Germany
| | - D Sanchez
- Institute for Functional Nanomaterials, University of Puerto RicoPO Box 23334, San Juan, 00931–3334, Puerto Rico
| | - N Ortega
- Institute for Functional Nanomaterials, University of Puerto RicoPO Box 23334, San Juan, 00931–3334, Puerto Rico
| | - R S Katiyar
- Institute for Functional Nanomaterials, University of Puerto RicoPO Box 23334, San Juan, 00931–3334, Puerto Rico
| | - M Echizen
- Cavendish Laboratory, University of CambridgeMadingley Road, Cambridge, CB3 0HE, UK
| | - E Colliver
- Cavendish Laboratory, University of CambridgeMadingley Road, Cambridge, CB3 0HE, UK
| | - S Dutton
- Cavendish Laboratory, University of CambridgeMadingley Road, Cambridge, CB3 0HE, UK
| | - J F Scott
- Cavendish Laboratory, University of CambridgeMadingley Road, Cambridge, CB3 0HE, UK
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Shimano M, Ochiai K, Murakami T, Echizen M, Narita H. [Case of functioning juvenile islet cell carcinoma with atypical symptoms]. Gan No Rinsho 1971; 17:891-4. [PMID: 4335995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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