Low-field dynamic magnetic alignment and templated grain growth of diamagnetic PMN–PT ceramics

A novel combination of low-field magnetic alignment (MA) and templated grain growth (TGG) was used to fabricate highly textured diamagnetic 0.72Pb(Mg1/3Nb2/3)O3–0.28PbTiO3 (0.72PMN–0.28PT) ceramics. Samples were produced by nonaqueous slip casting of PMN–PT slurries, in which diamagnetic plate-like...

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Bibliographic Details
Published in:Journal of materials research 2013-11, Vol.28 (21), p.2960-2969
Main Authors: Poterala, Stephen F., Meyer, Richard J., Messing, Gary L.
Format: Article
Language:English
Subjects:
Alignment
Analysis
Anisotropy
Applied and Technical Physics
Biomaterials
Brownian motion
Casting
Ceramics
Grain growth
Inorganic Chemistry
Magnetic fields
Materials Engineering
Materials research
Materials Science
Morphology
Nanotechnology
Particle size
Production methods
Sintering
Studies
Thermal energy
Viscosity
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Summary:A novel combination of low-field magnetic alignment (MA) and templated grain growth (TGG) was used to fabricate highly textured diamagnetic 0.72Pb(Mg1/3Nb2/3)O3–0.28PbTiO3 (0.72PMN–0.28PT) ceramics. Samples were produced by nonaqueous slip casting of PMN–PT slurries, in which diamagnetic plate-like 0.4(Na1/2Bi1/2)TiO3–0.6PbTiO3 (0.4NBT–0.6PT) template particles were aligned by dynamic MA in a 2.2-T permanent magnet array. Template alignment improved as slurry viscosity increased, with a 32-vol% solid loading (a viscosity of ∼0.1 Pa s at 0.1 s−1) giving optimal texture quality (7.85° FWHM, f = 92 vol%) after sintering and TGG. Alignment was stable for more than 3 h during slip casting, allowing fabrication of ∼1-cm thick textured ceramics with high piezoelectric response (d33 = 1222 pC/N). The success of dynamic MA at low magnetic field (2.2 T) is attributed to an increase in driving force for alignment of large (5–10 μm) template particles relative to the randomizing effect of Brownian motion (i.e., thermal energy kBT).
ISSN:0884-2914
2044-5326
DOI:10.1557/jmr.2013.303