Defect chemistry and transport properties of Nd-doped Pb(ZrxTi1−x)O3

Slouka, Christoph; Andrejs, Lukas; Fleig, Jürgen

doi:10.1007/s10832-014-9954-9

Cited by 10 publications

(16 citation statements)

References 38 publications

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“…Hence, grain boundary diffusion is orders of magnitude faster than bulk diffusion in La-doped PZT. However, this is not in the focus of this paper; a detailed discussion of grain boundary diffusion in PZT is given in [27,29,37]. …”

Section: Resultsmentioning

confidence: 99%

“…Additionally, different gas compositions were established by using pure O 2 , 1% O 2 in N 2 and pure N 2 . Before performing impedance measurements, all virgin samples underwent an equilibration in ambient air until a constant conductivity was reached [27]; this equilibration took place on a time scale of several hours to days and thus probably included also some cation motion. Mechanistic details on the exact processes during this equilibration are not available yet.…”

Section: Methodsmentioning

confidence: 99%

“…A more comprehensive study on rare earth doping can be found in [25]. It was also shown that donor doping does not lead to complete annihilation of the p-type conduction behaviour in PZT and furthermore does not entirely suppress the formation of oxygen vacancies [26,27,28,29,30,31]. Oxide ion motion was analysed for undoped and donor doped PZT as well as co-doped PZT with donor excess [32,33,34,35,36].…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Acceptor and Donor Doping on Oxygen Vacancy Concentrations in Lead Zirconate Titanate (PZT)

et al. 2016

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The different properties of acceptor-doped (hard) and donor-doped (soft) lead zirconate titanate (PZT) ceramics are often attributed to different amounts of oxygen vacancies introduced by the dopant. Acceptor doping is believed to cause high oxygen vacancy concentrations, while donors are expected to strongly suppress their amount. In this study, La3+ donor-doped, Fe3+ acceptor-doped and La3+/Fe3+-co-doped PZT samples were investigated by oxygen tracer exchange and electrochemical impedance spectroscopy in order to analyse the effect of doping on oxygen vacancy concentrations. Relative changes in the tracer diffusion coefficients for different doping and quantitative relations between defect concentrations allowed estimates of oxygen vacancy concentrations. Donor doping does not completely suppress the formation of oxygen vacancies; rather, it concentrates them in the grain boundary region. Acceptor doping enhances the amount of oxygen vacancies but estimates suggest that bulk concentrations are still in the ppm range, even for 1% acceptor doping. Trapped holes might thus considerably contribute to the charge balancing of the acceptor dopants. This could also be of relevance in understanding the properties of hard and soft PZT.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Effect of Acceptor and Donor Doping on Oxygen Vacancy Concentrations in Lead Zirconate Titanate (PZT)

et al. 2016

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“…This value is unusually high for a (nominally) donor-doped material and may come from PbO evaporation during sintering, which turns a nominally donor doped PZT into a slightly acceptor doped PZT with hole conduction. 31 However, here another effect comes into play: Oxygen tracer diffusion measurements with subsequent secondary ion mass spectrometry (SIMS) analysis revealed that the ionic transport and thus the majority of oxygen vacancies is located in or close to grain boundaries (Fig. 8c).…”

Section: A) B)mentioning

confidence: 99%

The Chemical Capacitance as a Fingerprint of Defect Chemistry in Mixed Conducting Oxides

Schmid¹,

Rupp

Slouka

et al. 2016

ACSi

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The oxygen stoichiometry of mixed conducting oxides depends on the oxygen chemical potential and thus on the oxygen partial pressure in the gas phase. Also voltages may change the local oxygen stoichiometry and the amount to which such changes take place is quantified by the chemical capacitance of the sample. Impedance spectroscopy can be used to probe this chemical capacitance. Impedance measurements on different oxides ((La,Sr)FeO 3-δ = LSF, Sr(Ti,Fe)O 3-δ = STF, and Pb(Zr,Ti)O 3 = PZT) are presented, and demonstrate how the chemical capacitance may affect impedance spectra in different types of electrochemical cells. A quantitative analysis of the spectra is based on generalized equivalent circuits developed for mixed conducting oxides by J. Jamnik and J. Maier. It is discussed how defect chemical information can be deduced from the chemical capacitance.

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“…Traditionally, PZT powders were prepared via the solid state reaction of oxides and carbonates at a temperature above 800°C [5]. The resultant powders are often large in grain size and a higher temperature ([1200°C) was required to compact the ceramics.…”

Section: Introductionmentioning

confidence: 99%

Improved sintering activity and piezoelectric properties of PZT ceramics from hydrothermally synthesized powders with Pb excess

Kan

Zhu

et al. 2016

J Mater Sci: Mater Electron

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In this work, Pb(Zr, Ti)O 3 (PZT) powders were prepared by traditional hydrothermal method and solid state reaction. Subsequently, PZT ceramics were sintered and their electric properties (including piezoelectric coefficient d 33 , electromechanical coupling coefficient k p and mechanical quality factor Q m ) as a function of sintering temperature (1125-1250°C) were comparably studied. Given that the Pb deficiency may exist in the hydrothermally synthesized PZT powders, effects of Pb excess (0, 20 and 80 mol%) in the hydrothermal precursor on their sinterability were also involved. The hydrothermally synthesized PZT powders with 80 mol% Pb excess showed the highest sintering activity, and their electric properties peaked at 1175°C (d 33 = 225 pC/N, k p = 0.446, Q m = 300). It's demonstrated that A-site deficiency may degrade the sintering activity of PZT powders, and hydrothermal synthesis of PZT powders with appropriate Pb excess was the compromising pathway to increase their sinterability, decrease the sintering temperature and lessen the volatilization of Pb ion in the fabrication of widely applied PZT ceramic.

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Defect chemistry and transport properties of Nd-doped Pb(ZrxTi1−x)O3

Cited by 10 publications

References 38 publications

The Effect of Acceptor and Donor Doping on Oxygen Vacancy Concentrations in Lead Zirconate Titanate (PZT)

The Effect of Acceptor and Donor Doping on Oxygen Vacancy Concentrations in Lead Zirconate Titanate (PZT)

The Chemical Capacitance as a Fingerprint of Defect Chemistry in Mixed Conducting Oxides

Improved sintering activity and piezoelectric properties of PZT ceramics from hydrothermally synthesized powders with Pb excess

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