Oxygen-vacancy-related relaxations of Sr3CuNb2O9 at high temperatures

Liu, Lina; Wang, Chunchang; Sun, Xiaohong; Wang, Guojing; Lei, Changmei; Li, Teng

doi:10.1016/j.jallcom.2012.10.081

Cited by 38 publications

(11 citation statements)

References 31 publications

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“…To get further information about R1, the same sample used in Fig [26] and Sr 3 CuNb 2 O 9 [27]. The surface layer is caused by the inhomogeneous distribution of oxygen vacancies in the outmost layer of the sample and can be eliminated or greatly weakened by grinding off the surface of the sample.…”

Section: The Low-temperature Dielectric Relaxation (R1)mentioning

confidence: 99%

Dielectric relaxations in multiferroic La2Ti2O7 ceramics

Zhang

Huang

et al. 2015

Journal of Alloys and Compounds

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Section: The Low-temperature Dielectric Relaxation (R1)mentioning

confidence: 99%

Dielectric relaxations in multiferroic La2Ti2O7 ceramics

Zhang

Huang

et al. 2015

Journal of Alloys and Compounds

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“…OVs form "clusters" with the increasing concentration in OVs, the correlation among OVs strengthens, thus the activation energy of OVs decreases and the movement of OVs become easier. 43 The activation energy (E a ) is dependent on the concentration of OVs: E a = 0 eV for stoichiometric ABO 2.8 , 0.5 eV for ABO 2.9 , 1.0 eV for ABO 2.95 , and 2.0 eV for ABO 3 . 44,45 According to our results, activation energy increases with the increasing concentration of Ba 2+ , this successfully indicates that Ba 2+ doping can reduce the volatilization of Pb 2+ and restrict the generation of OVs.…”

Section: Resultsmentioning

confidence: 99%

“…It is naturally expected that the OVs are "frozen-in" in low temperature region, but they can be thermally "ionized" with increasing temperature. 31,43 Conduction induced by OVs becomes dominant with increasing in temperature and frequency, because the mobility of oxygen ions become higher in high temperature region. 29 This also explains the significant increase in dielectric permittivity and dielectric loss at high temperature and FIG.…”

Section: Resultsmentioning

confidence: 99%

Oxygen-vacancy-related relaxation and conduction behavior in (Pb1-xBax)(Zr0.95Ti0.05)O3 ceramics

et al. 2014

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Failure behavior of Pb(Zr0.95Ti0.05)O3 ferroelectric ceramics under shock compression J. Appl. Phys. 113, 183501 (2013); 10.1063/1.4803052 Room-temperature magnetoelectric properties of Fe doped BaZr0.05Ti0.95O3 J. Appl. Phys. 113, 17D918 (2013); 10.1063/1.4795425Thermal stability of piezoelectric coefficients in (Ba1−xCax)(Zr0.05Ti0.95)O3: A lead-free piezoelectric ceramic Appl.(Pb 1-x Ba x )(Zr 0.95 Ti 0.05 )O 3 (x=0, 0.025, 0.05, 0.075 and 0.1) ceramics were prepared via a solid-state reaction route. Low-frequency (20 ∼ 2×10 7 Hz) dielectric properties were investigated in the temperature region of 25-650 • C. Ba 2+ doping can slightly reduce the phase transition temperature of ferroelectric to paraelectric. The dielectric diffuse anomaly in the dielectric relaxation was found in the high temperature region of 400-650 • C. Activation energy, calculated from the impedance and conductivity data of samples, suggests that the dielectric relaxation is due to oxygen vacancies generated during the sintering process. Ba 2+ doping can reduce significantly the concentration of oxygen vacancies, and slightly enhance activation energy for the migration of oxygen vacancies. Results of activation energy calculated from impedance and conductance suggest that the dielectric relaxation is due to the short-range hopping of oxygen vacancies, and the conduction due to the movement of doubly-ionized oxygen vacancies. C 2014 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License. [http://dx.

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“…However, the SCNO component demands much more attention during sintering in order to obtain a satisfactory phase purity and desired crystal structure. Unfortunately, SCNO is still poorly investigated in terms of the coexistence of non-stoichiometric and/or oxygen-deficient phases [8,12]. Furthermore, numerous equivalent descriptions and routines used to synthetize the pure crystal structure of SCNO were reported [7,13,14].…”

Section: Methodsmentioning

confidence: 99%

“…The first component is a new piezoelectric Sr 3 CuNb 2 O 9 [7,8] with stochastically distributed cations of mixed valency states. The second phase (cobalt ferrite) is a well-known hard magnetic material with high coercivity and moderate saturation magnetization [9].…”

Section: Introductionmentioning

confidence: 99%