ChemInform Abstract: Dielectric and Ferroelectric Properties of Ceramics in the Pb(Zn1/3Nb2/3)O3‐BaTiO3‐PbTiO3 System.

Halliyal, A.; Kumar, Umesh; Newnham, R. E.

doi:10.1002/chin.198717015

Cited by 25 publications

(32 citation statements)

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“…Attempts to synthesize perovskite PZN ceramics invariably results in the formation of a pyrochlore phase with accompanying degradation of the dielectric and piezoelectric properties. Various chemical additives, such as Ba(Zn 1/3 Nb 2/3 )O 3 , BaTiO 3 , and SrTiO 3 have thus been explored in an attempt to stabilize the perovskite PZN ceramic [9,10]. However, a trade-off is made with these additives leading to reduced dielectric constants and piezoelectric coefficients.…”

Section: Introductionmentioning

confidence: 99%

Dielectric properties and morphotropic phase boundaries in the xPb(Zn1/3Nb2/3)O3−(1−x)Pb(Zr0.5Ti0.5O3 pseudo-binary system

et al. 2006

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Ceramics in the xPb(Zn 1/3 Nb 2/3 )O 3 −(1 − x)Pb(Zr 0.5 Ti 0.5 )O 3 [xPZN-(1 − x)PZT] solid solution system are expected to display excellent dielectric, piezoelectric, and ferroelectric properties in compositions close to the morphotropic phase boundary (MPB). The dielectric behavior of ceramics with x = 0.1−0.6 has been characterized in order to identify the MPB compositions in this system. Combined with X-ray diffraction results, ferroelectric hysteresis measurements, and Raman reflectivity analysis, it was consistently shown that an MPB exists between x = 0.2 and x = 0.3 in this binary system. When x ≤ 0.2, the tetragonal phase dominates at ambient temperatures. In the range of x ≥ 0.3, the rhombohedral phase dominates. For this rhombohedral phase, electrical measurements reveal a profound frequency dispersion in the dielectric response when x ≥ 0.6, suggesting a transition from normal ferroelectric to relaxor ferroelectric between 0.5 ≤ x ≤ 0.6. Excellent piezoelectric properties were found in 0.3PZN-0.7PZT, the composition closest to the MPB with a rhombohedral structure. The results are summarized in a PZN-PZT binary phase diagram. N. Vittayakorn ( )

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Section: Introductionmentioning

confidence: 99%

Dielectric properties and morphotropic phase boundaries in the xPb(Zn1/3Nb2/3)O3−(1−x)Pb(Zr0.5Ti0.5O3 pseudo-binary system

et al. 2006

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“…However, its presence in small concentrations helps the sintering of the powder. Using the classical methods, the PZN phase is very difficult to obtain without stabilizers starting from the exact stoichiometry [6]. Therefore, the aqueous-solution technique appears very promising in the synthesis of pure PZN.…”

Section: Pbnb2/3znl/30 3 (Pzn) Powdermentioning

confidence: 99%

“…This has been explained on the basis of thermodynamic parameters, such as the ionic radii and the electronegativity, by Halliyal et al [6].…”

mentioning

confidence: 99%

Synthesis of ferroelectric perovskites through aqueous-solution techniques

Guzmán

Aegerter²,

Barboux³

et al. 1993

J Mater Sci

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The hydrolysis of niobates in aqueous solutions has been applied to the coprecipitation of PbNb2/3Mgl/303 leading to a low temperature synthesis of this ferroelectric relaxor ceramic. The effect of hydrolysis conditions -such as the concentration of bases and acids used, their rates of addition and the nature of the precursors salts -is described. The perovskite phase appears after heating at 350~ and is obtained as a pure phase at 800~ after heat treatment for 1 h. Relaxor ferroelectric ceramics with a high dielectric constant can be obtained by sintering at 1000 ~ The process has been also applied to the synthesis of other relaxor ceramic compositions such as PZN (PbNb2/3Znl/303) and PFN (PbNbl/2Fel/203) compounds.

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“…Pb(Zn 1/3 Nb 2/3 )O 3 (PZN) and its solid solutions belong to this ferroelectric group [2][3][4]. But polycrystalline ceramic PZN, which has perovskite structure, without other phase precipitation is very difficult to prepare by conventional solid state reaction [5,6] due to the unfavorable tolerance factor and the large difference of electronegativity [7]. So there has been many studies to stabilize PZN by partial substitution of A or B site cations such as PbTiO 3 and BaTiO 3 [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Preparation and electrical properties of 0.4Pb(Zn1/3Nb2/3)O3-0.6Pb(Zr0.4Ti0.6)O3 thin films by 2-step annealing method

2006

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Films of (1−x)Pb(Zn 1/3 Nb 2/3 )O 3 -xPb(Zr 0.4 Ti 0.6 ) O 3 (x = 0.6, 40PZN-60PZT) were deposited on Pt/TiO 2 / SiO 2 /Si substrate through spin coating. Using a combination of homogeneous precursor solution preparation and two-step pyrolysis process, we were able to obtain the 40PZN-60PZT thin films of perovskite phase virtually without pyrochlore phase precipitation after annealing above 650 • C. But since annealing done at the high temperatures for extended time can cause diffusion of Pt, TiO 2 and Si, and precipitation of nonstoichiometric PbO, we adopted 2-step annealing method to circumvent these problems. The 2-step annealed films show dense microstructure than the 1-step films annealed at higher temperature. Furthermore, the root-mean-square surface roughness of 220 nm thick films which are annealed at 720 • C for 1 min and then annealed at 650 • C for 5 min was found to be 3.9 nm by atomic force microscopy as compared to the 12 nm surface roughness of the film annealed only at 720 • C for 5 min. The electrical properties of 2-step annealed films are virtually same and those of the 1-step annealed films annealed at high temperature. The film 2-step annealed at 720 • C for brief 1 min and with subsequent annealing at 650 • C for 5 min showed a saturated hysteresis loop at an applied voltage of 5 V with remanent polarization (P r ) and coercive voltage (V c ) of 25.3 μC/cm 2 and 0.66 V respectively. The leakage current density was lower than 10 −5 A/cm 2 at an applied voltage of 5 V.

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ChemInform Abstract: Dielectric and Ferroelectric Properties of Ceramics in the Pb(Zn1/3Nb2/3)O3‐BaTiO3‐PbTiO3 System.

Abstract: The phase relations and dielectric properties of Pb(Zn1/3Nb2/3)O3 (PZN) ceramics with 5‐20 mol% BaTiO3 and 0‐20 PbTiO3 have been investigated.

Cited by 25 publications

References 1 publication

Dielectric properties and morphotropic phase boundaries in the xPb(Zn1/3Nb2/3)O3−(1−x)Pb(Zr0.5Ti0.5O3 pseudo-binary system

Dielectric properties and morphotropic phase boundaries in the xPb(Zn1/3Nb2/3)O3−(1−x)Pb(Zr0.5Ti0.5O3 pseudo-binary system

Synthesis of ferroelectric perovskites through aqueous-solution techniques

Preparation and electrical properties of 0.4Pb(Zn1/3Nb2/3)O3-0.6Pb(Zr0.4Ti0.6)O3 thin films by 2-step annealing method

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