Electric field effect on the rhombohedral–rhombohedral phase transformation in tin modified lead zirconate titanate ceramics

Yang, Pin; Rodriguez, Mark A.; Burns, George Robert; Stavig, Mark E.; Moore, Roger H.

doi:10.1063/1.1650893

Cited by 15 publications

(6 citation statements)

References 13 publications

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“…Because of a short-range electrostatic interaction along the spontaneous polarization direction between Pb +2 cation and O -2 anions on adjacent cells, during cooling this interaction leads to a change in the spontaneous polarization direction from the thermal strain direction in the FE RH phase ([111] c in a pseudocubic lattice setting) to the oxygen octahedral rotation in the FE RL phase and results in a volume decrease upon phase transformation. 6 Therefore, the observed behavior could be attributed to a rapid release of this short-range electrostatic interaction in the lattice as the small volume of FE RL phase increases its volume on heating and suddenly transforms into a larger volume FE RH phase.…”

Section: Resultsmentioning

confidence: 99%

“…The average of a positive CTE in the PE direction and a negative CTE in the PA direction leads to a near zero CTE value for the as-sintered samples. Because the spontaneous polarization in the FE RH is coupled to the thermal strain in the poled axis, 6 as temperature increases the spontaneous polarization progressively decreases and eventually diminishes at the Curie temperature. Concurrently, the strain decreases, resulting in a negative thermal expansion in this region.…”

Section: Resultsmentioning

confidence: 99%

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Thermal properties of PZT95/5(1.8Nb) and PSZT ceramics.

Rae¹,

Corelis²,

Yang³

et al. 2006

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Thermal properties of niobium-modified PZT95/5(1.8Nb) and PSZT ceramics used for the ferroelectric power supply have been studied from -100 °C to 375°C. Within this temperature range, these materials exhibit ferroelectric-ferroelectric and ferroelectric-paraelectric phase transformations. The thermal expansion coefficient, heat capacity, and thermal diffusivity of different phases were measured. Thermal conductivity and Grüneisen constant were calculated at several selected temperatures between -60°C and 100°C. Results show that thermal properties of these two solid solutions are very similar. Phase transformations in these ceramics possess first order transformation characteristics including thermal hysteresis, transformational strain, and enthalpy change. The thermal strain in the high temperature rhombohedral phase region is extremely anisotropic. The heat capacity for both materials approaches to 3R (or 5.938 cal/(g-mole*K)) near room temperature. The thermal diffusivity and the thermal conductivity are quite low in comparison to common oxide ceramics, and are comparable to amorphous silicate glass. Furthermore, the thermal conductivity of these materials between -60°C and 100°C becomes independent of temperature and is sensitive to the structural phase transformation. These phenomena suggest that the phonon mean free path governing the thermal conductivity in this temperature range is limited by the lattice dimensions, which is in good agreement with calculated values. Effects of small compositional changes and density/porosity variations in these ceramics on their thermal properties are also discussed. The implications of these transformation characteristics and unusual thermal properties are important in guiding processing and handling procedures for these materials.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Thermal properties of PZT95/5(1.8Nb) and PSZT ceramics.

Rae¹,

Corelis²,

Yang³

et al. 2006

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“…Additional indications of cooperative tilt-polarization coupling are the fact that the application of an electric field in PZT modified with Sn and Nb enhances T T of few degrees. 75 and its prediction in BiFeO 3 from a first-principle simulation. 64 The coupling between FE and AFD modes has also been discussed in relation with the appearance of new Raman 76,77 and infra-red 21 modes below T T .…”

Section: Cooperative Tilt-polarization Couplingmentioning

confidence: 99%

Effects of coupling between octahedral tilting and polar modes on the phase diagram of PbZr1-xTixO3 (PZT)

Cordero,

Trequattrini,

Craciun

et al. 2012

Preprint

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The results are presented of anelastic and dielectric spectroscopy measurements on large grain ceramic PbZr1−xTixO3 (PZT) with compositions near the two morphotropic phase boundaries (MPBs) that the ferroelectric (FE) rhombohedral phase has with the Zr-rich antiferroelectric and Ti-rich FE tetragonal phases. These results are discussed together with similar data from previous series of samples, and reveal new features of the phase diagram of PZT, mainly connected with octahedral tilting and its coupling with the polar modes. Additional evidence is provided of what we interpret as the onset of the tilt instability, when is initially frustrated by lattice disorder, and the long range order is achieved at lower temperature. Its temperature TIT (x) prosecutes the long range tilt instability line TT (x) up to TC, when TT drops. It is proposed that the difficulty of seeing the expected 1 2 111 modulations in diffraction experiments is due to the large correlation volume associated with that type of tilt fluctuations combined with strong lattice disorder.It is shown that the lines of the tilt instabilities tend to be attracted and merge with those of polar instabilities. Not only TIT bends toward TC and then merges with it, but in our series of samples the temperature TMPB of the dielectric and anelastic maxima at the rhombohedral/tetragonal MPB does not cross TT, but deviates remaining parallel or possibly merging with TT. These features, together with a similar one in Na 1/2 Bi 1/2 1−x BaxTiO3, are discussed in terms of cooperative coupling between tilt and FE instabilities, which may trigger a common phase transition. An analogy is found with recent simulations of the tilt and FE transitions in multiferroic BiFeO3 [Kornev and Bellaiche, Phys. Rev. B 79, 100105 (2009)].An abrupt change is found in the shape of the anelastic anomaly at TT when x passes from 0.465 to 0.48, possibly indicative of a rhombohedral/monoclinic boundary.

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“…As shown in Figure 4, the polarization hysteresis loop measurement up to 40 kV/cm in a circular disk bulk sample did not reveal any distortions that may suggest a phase change. Furthermore, there are experimental evidences that in a bulk ceramic with rhombohedral symmetry, electric fields stabilizes the FE RL phase (Yang et al, 2004a), whereas in BaTiO 3 single crystals, the ferroelectric-to-ferroelectric phase transition is dictated by the direction of the electric field (Wada et al, 1999).…”

Section: Electric Field In Situ Tem Studymentioning

confidence: 99%

“…When electric fields are applied to a polycrystalline ceramic specimen with random oriented grains, either FE RH or FE RL phase could be favored. A previous study with X-ray diffraction indicated that near the FE RH / FE RL phase transition temperature, the application of an electrical field favors the FE RL phase and expands its stable region to a higher temperature in a bulk Snmodified lead zirconate titanate ceramic (Yang et al, 2004a). In this study, the FE RH $ FE RL phase transition triggered by temperature and electric field was investigated by electron diffraction in transmission electron microscopy (TEM) in thin foils of a Nb-doped lead zirconate titanate ceramic.…”

Section: Introductionmentioning

confidence: 98%

In situ transmission electron microscopy study on Nb‐doped Pb(Zr_0.95Ti_0.05)O₃ ceramics

Tan

Yang

2009

Microscopy Res & Technique

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The ferroelectric-to-ferroelectric phase transition between the high temperature (FE RH ) and the low temperature (FE RL ) rhombohedral phases in a Nb-doped Pb(Zr 0.95 Ti 0.05 )O 3 ceramic was investigated with transmission electron microscopy (TEM). Both bright field images and electron diffraction patterns were monitored as a function of temperature as well as dc electric field. A special TEM specimen holder that permits the application of electric voltage up to 600 V was employed for the study of electric field-induced phase transition. It was found that both [1/2] (011) (Jaffe et al., 1971). It has been shown that the FE RH ? FE RL transition is manifested by the doubling of the perovskite unit cell, with the space group changing from R3m to R3c (Glazer et al., 1978). In compositions that are further closer to PbZrO 3 , an antiferroelectric phase with the space group Pbam becomes stable (Jaffe et al., 1971;Woodward et al., 2005). At ambient conditions, Pb(Zr 0.95 Ti 0.05 )O 3 is at the antiferroelectric/ferroelectric phase boundary. A small amount of Nb (usually 2 at %) is often used to stabilize the ferroelectric phase in this composition (Yang et al., 2005). As a consequence, ferroelectric $ ferroelectric and ferroelectric $ antiferroelectric phase transitions can be easily triggered in these ceramics.External electric fields are known to be capable of triggering antiferroelectric-to-ferroelectric Pan et al., 1989;Yang and Payne, 1992) and relaxor-to-ferroelectric Ye and Schmid, 1993) phase transitions in various Pb-based perovskite compounds. In these field-induced transitions, the electric field aligns the short-range ordered electrical dipoles to the external field direction, stabilizing the ferroelectric phase with long-range dipole order. In ferroelectric single crystals, strong electric fields along a nonpolar axis have been found to rotate the polarization vector. The rotation of the polar axis changes the symmetry of the crystal, leading to a field-induced ferroelectric-to-ferroelectric phase transition (Park and Shrout, 1997;Wada et al., 1999;Zhao et al., 2007).

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Electric field effect on the rhombohedral–rhombohedral phase transformation in tin modified lead zirconate titanate ceramics

Cited by 15 publications

References 13 publications

Thermal properties of PZT95/5(1.8Nb) and PSZT ceramics.

Thermal properties of PZT95/5(1.8Nb) and PSZT ceramics.

Effects of coupling between octahedral tilting and polar modes on the phase diagram of PbZr1-xTixO3 (PZT)

In situ transmission electron microscopy study on Nb‐doped Pb(Zr_0.95Ti_0.05)O₃ ceramics

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Electric field effect on the rhombohedral–rhombohedral phase transformation in tin modified lead zirconate titanate ceramics

Cited by 15 publications

References 13 publications

Thermal properties of PZT95/5(1.8Nb) and PSZT ceramics.

Thermal properties of PZT95/5(1.8Nb) and PSZT ceramics.

Effects of coupling between octahedral tilting and polar modes on the phase diagram of PbZr1-xTixO3 (PZT)

In situ transmission electron microscopy study on Nb‐doped Pb(Zr0.95Ti0.05)O3 ceramics

Contact Info

Product

Resources

About

In situ transmission electron microscopy study on Nb‐doped Pb(Zr_0.95Ti_0.05)O₃ ceramics