Synthesis of slightly 〈111〉-oriented 0.65Pb(Mg1/3Nb2/3)O3–0.35PbTiO3 ceramic prepared from fine powders

In this work we present a Raman scattering study of a specific region of the morphotropic phase boundary (MPB) of the [Pb(Mg 1/3 Nb 2/3 )O 3 ] 1−x (PbTiO 3 ) x relaxor system. We performed low-temperature measurement for the x = 0.4 composition in the 20-300 K temperature range, and a detailed analysis of Raman spectra of x = 0.4 and x = 0.37 compositions at 180 K. The analysis of Raman spectra indicates a structural phase transition at around 170 K for x = 0.4. The comparison of Raman data from x = 0.4 and x = 0.37 compositions suggests different phases for these samples at 180 K. These results are in accordance with the tetragonal to monoclinic structural phase transition observed in the PMN-PT MPB and contribute to improve the knowledge of the MPB of this solid solution. Additionally, we have performed the lattice dynamics phonon calculation of the (1 − x) PMN-xPT relaxor in order to best understand its complex Raman spectral properties. The normal mode analyses (at q ∼ 0) were performed by considering tetragonal symmetry for the (1 − x) PMN-xPT system and using the rigid ion model and mean field approximation. Our calculated wavenumber values are in good agreement with experimental and calculated results reported for PbTiO 3 thus providing a reliable assignment of the various Raman modes. The low wavenumber modes are interpreted as arising from a lifting of the degeneracy of the vibrational modes related to Mg, Nb and Ti sites.

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“…[22], and the initial charges, almost unchanged in the fittings, were those reported in the Ref. [23].…”

Section: Lattice Dynamics Calculationssupporting

confidence: 54%

“…The atomic positions, potentials and the effective charges were optimized with respect to free energy. [21] In Table 2 we show the experimental [22] and calculated (our results) structural parameters. It can be seen that the deviations between the calculated and experimental lattice parameters are of the order of 1%.…”

Section: Lattice Dynamics Calculationsmentioning

confidence: 99%

Lattice dynamics and low‐temperature Raman spectroscopy studies of PMN–PT relaxors

Lima

Paraguassu

Freire

et al. 2009

J Raman Spectroscopy

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“…This alternative was also applied to produce MgNb 2 O 6 powders, which were used as precursors to produce the PMN phase, obtained by the solid-state reaction between MgNb 2 O 6 and PbO (Guarany, 2006;Guerra et al, 2009). The polymerized based on the Pechini method combined with the columbite method was also applied to obtain good-quality PMN-PT ceramics at compositions around the MPB with a tendency to <111>-orientation (Araújo et al, 2007). The texture tendency observed in these ceramics was attributed to shear rates introduced during the ceramic pressing when a fine powder was used.…”

Section: Processing and Synthesis Of Pmn-ptmentioning

confidence: 99%

Recent Advances in Processing, Structural and Dielectric Properties of PMN-PT Ferroelectric Ceramics at Compositions Around the MPB

Araújo¹

2011

Advances in Ceramics - Electric and Magnetic Ceramics, Bioceramics, Ceramics and Environment

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“…The green bodies obtained from the optimum loading were found to have densities of 4.18(3) g cm À3 , corresponding to a PMNT loading of 42.5 (5) vol%. Lower loadings were found to result in ceramics with densities <95% of the theoretical maximum, as obtained from the molecular mass and previous refinements of the unit cell volume [22], and while producing such ceramics with greater porosity is often not desirable, it is a feature that can have useful benefits. SEM images of green composites showed undulations at the sides of the green bodies that originate from light scattered horizontally (Fig.…”

mentioning

confidence: 71%

Additively‐manufactured piezoelectric devices

Woodward

Purssell

Billson

et al. 2015

Physica Status Solidi (a)

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This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.A low-cost micro-stereolithography technique with the ability to additively manufacture dense piezoelectric ceramic components is reported. This technique enables the layer-wise production of functional devices with a theoretical in-plane resolution of $20 mm and an out-of-plane resolution of <1 mm without suffering a significant reduction in the piezoelectric properties when compared to conventionally produced ceramics of the same composition. The ability to fabricate devices in complex geometries and with different material properties means that conventional limits of manufacturing are not present. A hollow, spherical shell of the piezoelectric material 0.65Pb(Mg1 /3 Nb2 /3 )O 3 -0.35PbTiO 3 , built without tooling or recourse to additional equipment or processes, is shown generating ultrasound in the MHz range.

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Synthesis of slightly 〈111〉-oriented 0.65Pb(Mg1/3Nb2/3)O3–0.35PbTiO3 ceramic prepared from fine powders

Cited by 19 publications

References 14 publications

Lattice dynamics and low‐temperature Raman spectroscopy studies of PMN–PT relaxors

Lattice dynamics and low‐temperature Raman spectroscopy studies of PMN–PT relaxors

Recent Advances in Processing, Structural and Dielectric Properties of PMN-PT Ferroelectric Ceramics at Compositions Around the MPB

Additively‐manufactured piezoelectric devices

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