Dielectric and piezoelectric properties of PZT ceramics with anisotropic porosity

Piazza, Daniele; Galassi, Carmen; Barzegar, A.; Damjanović, Dragan

doi:10.1007/s10832-008-9553-8

Cited by 21 publications

(12 citation statements)

References 32 publications

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“…The high porosity of PZT is partly responsible for its low microhardness. Porosity of plasma sprayed coatings is anisotropic [11,12], but likewise the presence of pressure during a cold consolidation of powder before sintering could be also responsible for the anisotropic porosity of certain bulk PZT parts [13]. Such pores are predominantly aligned along the surface and represent a boundary between neighboring splats which affects relative permittivity [14].…”

Section: Discussionmentioning

confidence: 99%

Microstructure and Properties of Plasma Sprayed Lead Zirconate Titanate (PZT) Ceramics

et al. 2012

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Lead zirconate titanate (PZT) was plasma sprayed onto various substrates of different character. Additionally, a free-standing body made by plasma spraying was investigated. X-ray diffraction analyses of a decomposition of the as-sprayed coating products detected components of the PT-PZ system as well as binary oxides-PbO and ZrO 2 . Due to the comparatively complex phase character, the Curie temperature monitored by DTA, had a smeared appearance without pronounced maxima. The corresponding electrical properties are comparable with those typically observed for CaTiO 3 , but are worse than the normal values of bulk PZT due to defective stoichiometry.

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Section: Discussionmentioning

confidence: 99%

Microstructure and Properties of Plasma Sprayed Lead Zirconate Titanate (PZT) Ceramics

et al. 2012

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“…Since the crack surface could act as a source of uncompensated piezoelectric charges created during AC stress loading, microcracks could possibly influence the frequency dispersion of the d 33 via Maxwell-Wagner relaxation, as recently discussed for anisotropic pores in PZT. 49 In addition, they could even play a more active role, for example, by opening and closing under external AC stress field, which could also affect the piezoelectric nonlinearity. However, our recent SEM investigations (not reported here) did not show any evidence of the presence of microcracks in poled samples.…”

Section: E Discussion On Piezoelectric Nonlinearity In Bifeomentioning

confidence: 99%

Piezoelectric nonlinearity and frequency dispersion of the direct piezoelectric response of BiFeO3 ceramics

Rojac¹,

Benčan²,

Dražić³

et al. 2012

Journal of Applied Physics

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We report on the frequency and stress dependence of the direct piezoelectric d 33 coefficient in BiFeO 3 ceramics. The measurements reveal considerable piezoelectric nonlinearity, i.e., dependence of d 33 on the amplitude of the dynamic stress. The nonlinear response suggests a large irreversible contribution of non-180° domain walls to the piezoelectric response of the ferrite, which, at present measurement conditions, reached a maximum of 38% of the total measured d 33 . In agreement with this interpretation, both types of non-180° domain walls, characteristic for the rhombohedral BiFeO 3 , i.e., 71° and 109°, were identified in the poled ceramics using transmission electron microscopy (TEM). In support to the link between nonlinearity and non-180° domain wall contribution, we found a correlation between nonlinearity and processes leading to deppining of domain walls from defects, such as quenching from above the Curie temperature and high-temperature sintering. In addition, the nonlinear piezoelectric response of BiFeO 3 showed a frequency dependence that is 2 qualitatively different from that measured in other nonlinear ferroelectric ceramics, such as "soft" (donor-doped) Pb(Zr,Ti)O 3 (PZT), i.e., in the case of the BiFeO 3 large nonlinearities were observed only at low field frequencies (<0.1 Hz); possible origins of this dispersion are discussed. Finally, we show that, once released from pinning centers, the domain walls can contribute extensively to the electromechanical response of BiFeO 3 ; in fact, the extrinsic domain-wall contribution is relatively as large as in Pb-based ferroelectric ceramics with morphotropic phase boundary (MPB) composition, such as PZT. This finding might be important in the search of new lead-free MPB compositions based on BiFeO 3 as it suggests that such compositions might also exhibit large extrinsic domain-wall contribution to the piezoelectric response. a) Electronic mail: tadej.rojac@ijs.si 3

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“…However, there are some specific applications where a certain porosity level may be useful, e.g. for acoustic impedance adjustment, for permittivity reduction and increase tunability by local field concentration [25,26]. Other use of porous ceramics can be realized by embedding functional groups or other phases into the pores to extend multifunctionality for applications in catalysis and adsorbent supports [27], sensors [28][29][30][31], piezoelectric transducers [32] or multiferroic-based multistate memory devices [33,34] achievement of closed porosity are necessary.…”

Section: Introductionmentioning

confidence: 99%

Study of the role of porosity on the functional properties of (Ba,Sr)TiO 3 ceramics

Stanculescu

Ciomaga

Padurariu

et al. 2015

Journal of Alloys and Compounds

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Dielectric and piezoelectric properties of PZT ceramics with anisotropic porosity

Cited by 21 publications

References 32 publications

Microstructure and Properties of Plasma Sprayed Lead Zirconate Titanate (PZT) Ceramics

Microstructure and Properties of Plasma Sprayed Lead Zirconate Titanate (PZT) Ceramics

Piezoelectric nonlinearity and frequency dispersion of the direct piezoelectric response of BiFeO3 ceramics

Study of the role of porosity on the functional properties of (Ba,Sr)TiO 3 ceramics

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