PMN–PT Ceramics Prepared By Spark Plasma Sintering

Zuo, Ruzhong; Granzow, Torsten; Rödel, Jürgen

doi:10.1111/j.1551-2916.2007.01533.x

Cited by 37 publications

(22 citation statements)

References 46 publications

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Section: Resultsmentioning

confidence: 79%

“…[24] Due to the combined effects of PPT and nano-domain contribution as stated above, poled CZ5 ceramics exhibit superior piezoelectric performance at room temperature. The piezoelectric coefficient d 33 reached 357 pCN -1 , which is among the top values for randomly-orientated KNN ceramics and is comparable to those of hard PZT [25] 5 and PMN-PT [26] ceramics prepared by conventional route, though outperformed by PMN-PT crystals.[27] Large unipolar strain output of 0.16 % was also obtained under an electric field of 6 kVmm -1 , accompanied by a small strain hysteresis (see Figure 1(c)), enabling the current material to be a promising potential for actuator applications. Nevertheless, excellent thermal stability of strain behavior is further demanded for successful implementations.…”

mentioning

confidence: 88%

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Diffused Phase Transition Boosts Thermal Stability of High‐Performance Lead‐Free Piezoelectrics

Yao

Wang

et al. 2016

Adv Funct Materials

298

119

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Abstract:High piezoelectricity of (K,Na)NbO 3 (KNN) lead-free materials benefits from a polymorphic phase transition (PPT) around room temperature, but its temperature sensitivity has been a bottleneck impeding their applications. We find that good thermal stability can be achieved in CaZrO 3 -modified KNN lead-free piezoceramics, in which the normalized strain d 33 * almost keeps constant from room temperature up to 140 o C. In situ synchrotron X-ray diffraction experiments combined with permitivity measurements disclose the occurrence of a new phase transformation under an electrical field, which extends the transition range between tetragonal and orthorhombic phases. It is revealed that such an electrically-enhanced diffused 2 polymorphic phase transition (EED-PPT) contributed to the boosted thermal stability of KNN based lead-free piezoceramics with high piezoelectricity. The present approach based on phase engineering should also be effective in endowing other lead-free piezoelectrics with high piezoelectricity and good temperature stability. IntroductionPiezoelectricity, a phenomenon whereby materials become electrically polarized upon the application of stress or deform in response to electrical stimuli, has been an active research topic since its discovery in 1880 by Pierre and Jacques Curie, because of its scientific interests and abundant applications. For the last half-century, the lead-contained materials, e.g., Pb(Zr,Ti)O 3 (PZT) and Pb(Mg,Nb)O 3 -PbTiO 3 (PMN-PT), have been the icons of piezoelectrics, exhibiting a morphotropic phase boundary (MPB), where plural phases with negligible difference in free energy coexist and strongly enhanced functional properties arise.[1] However, a possible toxicity of lead in PZT and PMN-PT has been raising intense health and environmental concerns; thus, the last decade has witnessed the surging dedication to viable lead-free alternatives. [2][3][4][5] Resembling the principle characteristics of MPB, [4][5][6][7][8][9][10] polymorphic phase transition (PPT) boundary has also been extensively pursued. [2, 11,12] Unfortunately, contrary to the nearly vertical MPB in the well-known PZT and PMN-PT systems, [1] the PPT in lead-free piezoelectrics is always tilted, resulting in unavoidable thermally unstable electromechanical properties. [13][14][15] Weak thermal stability is unacceptable for many industrial applications, even though lead-free piezoelectrics have competitive performance at ambient conditions. To address the issue, two approaches have been adopted so far, i.e., fabricating textured samples, [2] or shifting the PPT temperature T O-T well below room temperature. [13] However, the former confronts the poor reproducibility due to an excessively complex synthesis procedure; while the latter would inevitably sacrifice a large 3 portion of piezoelectric activity. Consequently, a barrier still exists in developing reliable lead-free piezomaterials as alternatives to currently market-dominating lead-based materials.Inspired by the nature of MPB in PZT and PMN-PT...

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Section: Resultsmentioning

confidence: 79%

mentioning

confidence: 88%

Diffused Phase Transition Boosts Thermal Stability of High‐Performance Lead‐Free Piezoelectrics

Yao

Wang

et al. 2016

Adv Funct Materials

298

119

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“…Micrographs of the polished surfaces of 0.9NaNbO 3 -0.1SrTiO 3 ceramics processed by different means: a) conventionally sintered at 1 100 8C for 2 h (optical micrographs), and, b) SPS at 1 100 8C/50 MPa (scanning electron micrographs). [48] ADVANCED ENGINEERING MATERIALS 2009, 11 [129][130][131][132][133] The SPS process has also been determined to be very effective for the densification of 0.65Pb(Mg 1/3 -Nb 2/3 )O 3 -0.35PbTiO 3 ceramics. This fact is very important because, in this material, the higher the density and the larger the average grain size, the better the dielectric and piezoelectric properties that are obtained.…”

Section: High-sensitivity Piezoelectrics Chemically Derived From Pbtiomentioning

confidence: 99%

“…Moreover, the SPS process allows a capillary driven 0.65PMN-0.35PT single crystal to be fabricated, with a high density, by increasing the density of the polycrystalline matrix precursor during heat treatment. [131] Very recently, a deeper study, carried out by Zuo et al, [132] showed that a strongly frequency dependent and broad diffuse phase transition can be observed for all SPS samples, together with low remnant polarization and strain, and a high coercive field. These exceptional electrical properties of SPS samples are attributed to the fine grain size and the heterogeneity in microstructure and composition.…”

Section: High-sensitivity Piezoelectrics Chemically Derived From Pbtiomentioning

confidence: 99%

Spark Plasma Sintering as a Useful Technique to the Nanostructuration of Piezo‐Ferroelectric Materials

2009

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“…In this group, which shows piezoelectric effect, ten point groups (including 1, 2, m, mm2, 4, 4mm, 3, 3m, 6 and 6mm) have only one unique direction axis. Such crystals are polar crystals and they show spontaneous polarization and ferroelectric effect [20]. The particle size is calculated from X-ray diffraction profiles of strong reflections with intensity % greater than 30 using Scherrer's equation by measuring the full width at half maximum (FWHM).…”

Section: X-ray Analysis Of Bnnmentioning

confidence: 99%

Mechanical properties of ceramic-polymer nanocomposites

Abraham¹,

Kuryan²,

Isac³

et al. 2009

Express Polym. Lett.

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Nano crystalline powders of Barium Sodium Niobate (BNN) with the composition Ba3–2x Na4+x R Nb10 O30 with (R stands for rare earth = 0, x = 0) have been prepared by conventional ceramic technique. Barium Sodium Niobate can form a wide range of solid solutions, incorporating rare earth and alkali, alkaline earth elements with different compositions. The powder belonged to tungsten bronze type structure with tetragonal symmetry and lattice constants a = b = 1.2421 nm and c = 0.3903 nm. XRD (X-ray Diffraction) SEM (Scanning Electron Microscope) and AFM (Atomic Force Microscope) studies revealed that the particle size is in the nanometer range. Composites are prepared by mixing powders of BNN with polystyrene at different volume fractions of the BNN. Melt mixing technique is carried out in a Brabender Plasticoder at a rotor speed of 60 rpm (rotations per minute) for composite preparation. Mechanical properties such as stress-strain behavior, Young’s modulus, tensile strength, strain at break etc. are evaluated. Addition of filler enhances the mechanical properties of the polymer such as Young’s modulus and tensile strength. The composites showed the trend of perfect adhesion between the filler and the polymer. The filler particles are distributed relatively uniform fashion in all composites and the particles are almost spherical in shape with irregular boundaries. To explore more carefully the degree of interfacial adhesion between the two phases, the results are analyzed by using models featuring adhesion parameter. The experimental results are compared with theoretical predictions

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PMN–PT Ceramics Prepared By Spark Plasma Sintering

Cited by 37 publications

References 46 publications

Diffused Phase Transition Boosts Thermal Stability of High‐Performance Lead‐Free Piezoelectrics

Diffused Phase Transition Boosts Thermal Stability of High‐Performance Lead‐Free Piezoelectrics

Spark Plasma Sintering as a Useful Technique to the Nanostructuration of Piezo‐Ferroelectric Materials

Mechanical properties of ceramic-polymer nanocomposites

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