Association of oxygen vacancies with impurity metal ions in lead titanate

Erhart, Paul; Eichel, Rüdiger‐A.; Träskelin, Petra; Albe, Karsten

doi:10.1103/physrevb.76.174116

Cited by 102 publications

(110 citation statements)

References 49 publications

Supporting

Mentioning

100

Contrasting

Order By: Relevance

“…The activation energies of the oxygen vacancies migration were assessed to amount to (0.90±0.05) eV, (0.84±0.05) eV and (0.052±0.05) eV, respectively for BPT, BPTC(1 %) and BPTC(0.1 %) ceramics. The activation energy of free oxygen vacancy migration in ferroelectric perovskite oxides has been reported to be of 0.8-1 eV [51,52] thus we can relate the high-temperature electric conduction determined for BPT and BPTC(1 %) ceramics to the process of oxygen vacancies migration. As the distribution of the oxygen vacancies in the lattice has been considered in the tetragonal phase of the ferroelectric perovskites only [26,50,52] it is hard to discuss the lowering of the activation energy for BPTC(0.1 %) since the energy landscape of oxygen and probably also Pb vacancies is uncertain.…”

Section: Resultsmentioning

confidence: 99%

Effect of cobalt doping on the dielectric response of Ba0.95Pb0.05TiO3 ceramics

et al. 2013

View full text Add to dashboard Cite

Dielectric response of Ba 0.95 Pb 0.05 TiO 3 ceramics doped with 0.1 and 1 wt.% of Co 2 O 3 , synthesized by conventional high-temperature method, was studied in wide temperature and frequency range. The temperature dependences of the real and the imaginary parts of dielectric permittivity of the ceramics were compared with those of BaTiO 3 and Ba 0.95 Pb 0.05 TiO 3. The addition of Co 3+ ions results in a broadening of dielectric anomalies related to the transition to paraelectric cubic phase, and the structural transition between the tetragonal and the orthorhombic phases. At low temperatures (125-200 K) the dielectric absorption of Co-doped Ba 0.95 Pb 0.05 TiO 3 ceramics was found to exhibit relaxor-like properties. The dielectric response has been found to contain the contributions characteristic of fluctuations of the polar nanoregion boundaries and reorientations of the dipole moments between allowed directions in the nanoregions in the rhombohedral and the orthorhombic phases. The behavior speaks in favor of ordering of polar defects in the host lattice of Ba 0.95 Pb 0.05 TiO 3 in a form polar nanoregions .

show abstract

Section: Resultsmentioning

confidence: 99%

Effect of cobalt doping on the dielectric response of Ba0.95Pb0.05TiO3 ceramics

et al. 2013

View full text Add to dashboard Cite

show abstract

“…For example, this setup corresponds to dopant-oxygen vacancy complexes in transition metal doped perovskites. It has been reported [15][16][17] that such complexes form immediately during the synthesis process, that they have much slower relaxation times than the free dipoles related to the ferroelectric soft mode, and that different relative orientations towards the spontaneous polarization of the host ferroelectric material are possible. In the present study, we assume fixed defect dipoles, which is a rather realistic approximation at low and ambient temperatures during the time span of a typical ECE measurement, cf.…”

Section: Polar Complexesmentioning

confidence: 99%

“…2,4,6,18,19 In particular, experimental and theoretical investigations reveal the important role of transition metal doping on fatigue behavior in ferroelectric perovskites. 12,[15][16][17] It has been found that an internal bias field builds up in field polarized (poled) Cr doped BTO, which could be related to the alignment of defect dipoles with the overall polarization. 12 In this context Erhart and co-workers performed detailed ab initio based transition state theory simulations on transition metal doped perovskites.…”

Section: Introductionmentioning

confidence: 99%

“…12 In this context Erhart and co-workers performed detailed ab initio based transition state theory simulations on transition metal doped perovskites. [15][16][17] They found that polar O-vacancy dopant complexes, which induce local dipoles, form immediately. It is most favorable if these dipoles align parallel to the overall polarization.…”

Section: Introductionmentioning

confidence: 99%

“…[8][9][10][11][12][13][14][15][16][17] Both, doping and defects, influence remanent polarization and polarization switching, which are important for the caloric response. Evidently, even the modification of the ferroelectric phase diagram under such doping is still unclear.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of defects on ferroelectric and electrocaloric properties ofBaTiO3

Grünebohm

Nishimatsu

2016

Phys. Rev. B

View full text Add to dashboard Cite

We report modifications of the ferroelectric and electrocaloric properties of BaTiO3 by defects. For this purpose, we have combined ab initio-based molecular dynamics simulations with a simple model for defects. We find that different kinds of defects modify the ferroelectric transition temperatures and polarization, reduce the thermal hysteresis of the transition and are no obstacle for a large caloric response. For a locally reduced polarization the ferroelectric transition temperature and the adiabatic response are slightly reduced. For polar defects an intriguing picture emerges. The transition temperature is increased by polar defects and the temperature range of the large caloric response is broadened. Even more remarkable, we find an inverse caloric effect in a broad temperature range.

show abstract

In Situ Neutron Diffraction Studies on Poling of the Hard PZT Ceramic PIC181

et al. 2019

View full text Add to dashboard Cite

The poling of hard Lead Zirconate Titanate (PZT) materials is a complex process requiring optimisation of the poling parameters time, temperature, and electric field magnitude. A unique method is presented to monitor the poling process in operando on the unit cell level with neutron diffraction through the analysis of changes in reflection patterns. Diffraction analysis after poling reveals the lattice and domain contributions using poling strain as a measure. This allows for the evaluation of induced dipole alignment and process efficiency. It gives insight into the role of domain wall motions in hard PZT ceramics and how they are affected by poling parameters. Additionally, a poled sample is cycled bipolar and analyzed. It shows a strongly asymmetric strain hysteresis with major contributions from domain wall motions in the tetragonal phase. Macroscopically measured hysteresis loops verify the findings from diffraction. The present work contributes to improving poling results, efficiency and saving energy. The diffraction analysis allows a novel investigation method of the poling mechanisms and provides extensive results that give new insights into the material behavior. With a fundamental research method, this work reveals unprecedented details that can be directly applied to the specific application field of poling technology.

show abstract

Association of oxygen vacancies with impurity metal ions in lead titanate

Cited by 102 publications

References 49 publications

Effect of cobalt doping on the dielectric response of Ba0.95Pb0.05TiO3 ceramics

Effect of cobalt doping on the dielectric response of Ba0.95Pb0.05TiO3 ceramics

Influence of defects on ferroelectric and electrocaloric properties ofBaTiO3

In Situ Neutron Diffraction Studies on Poling of the Hard PZT Ceramic PIC181

Contact Info

Product

Resources

About