Electron paramagnetic resonance of three manganese centers in reduced SrTi<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Serway, Raymond A.; Berlinger, W.; Müller, K. A.; Collins, R. W.

doi:10.1103/physrevb.16.4761

Cited by 117 publications

(60 citation statements)

References 21 publications

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“…For intermediate ionic radii values, exceptions from this rule were suggested proposing a shared site occupancy. This situation is termed as amphoteric and a certain kind of dopant ion is incorporated simultaneously on the A-and B-site [9][10][11][12][13]. For trivalent dopants, this scenario comprises a mechanism of selfcompensation.…”

Section: Introductionmentioning

confidence: 99%

Defect structure of oxide ferroelectrics—valence state, site of incorporation, mechanisms of charge compensation and internal bias fields

2007

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The defect structure of aliovalent transitionmetal and rare-earth functional centers in ferroelectric perovskite oxides is characterized by means of multifrequency electron paramagnetic resonance spectroscopy, assisted by density-functional theory calculations. The review is mainly focused on lead zirconate titanate (Pb[Zr x Ti 1−x ]O 3 , PZT) compounds. However, where available also results on ferroelectric 'lead-free' compounds are discussed. The results include the formation of charged (Fe Zr,Ti − V •• O ) • defect dipoles, causing internal bias fields, multivalence manganese centers, acceptor-type copper functional centers creating isolated oxygen vacancies that promote ionic conductivity, as well as Gd • Pb donor-type centers. Moreover, the impact of the defect structure on macroscopic material properties is discussed.

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Section: Introductionmentioning

confidence: 99%

Defect structure of oxide ferroelectrics—valence state, site of incorporation, mechanisms of charge compensation and internal bias fields

2007

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“…Figure 3 shows the EPR spectra. Two peaks are detected at about 1800 and 3200 Gauss which are attributed respectively to the Mn 4+ [11,12] or PbTiO 3 [13], its quality is bad. This can be explained by the Mn high concentration.…”

Section: Structural Analysismentioning

confidence: 99%

Mn Effect on Nonlinear and Structural Properties of <110> Oriented PZN-4.5PT Single Crystals

Kobor¹,

Tine²,

Hajjaji³

et al. 2012

JMP

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Ferroelectric single crystals Pb(Zn 1/3 Nb 2/3 )O 3 -PbTiO 3 (PZN-PT) are promising full materials for non resonant or large bandwidth transducers due to the large values of their piezoelectric properties (d ij , k ij ) and their low mechanical quality factor (Q ij ). Many studies on <001> oriented PZN-4.5PT single crystals were carried out but it is very difficult to find research findings on <110> oriented Mn doped PZN-PT. Thus, investigations were made using XRD, Raman and EPR characterization for <110> oriented PZN-4.5PT grown through the Flux method. Mn doping effect on structural, dielectric, mechanical and piezoelectric properties with two values of Mn percentage (1 and 2 mol%) are also reported in this paper. Through the XRD study, the lattice parameters of doped PZN-PT crystals are slightly increased compared to the undoped one but the Mn didn't change its structure. The room temperature dielectric permittivity along <110> direction is about 1572 and 1626 (respectively 1% and 2% Mn doped crystals) which are much lower than that of the undoped PZN-4.5PT (2553). The remnant polarization and coercive field of <110> oriented doped crystal measured at 1 KHz are respectively 30 µC/cm 2 and 4.30 kV/cm (PZN-4.5PT), 32 µC/cm 2 and 6.10 kV/cm (PZN-4.5PT + 1% Mn) and 28 µC/cm 2 and 7.30 kV/cm (for the 2% Mn doped crystal). The mechanical quality factor Q m changed from 139 to 441 respectively for the pure and 1% Mn doped single crystals at room temperature while it decreases slightly to 336 for the 2 mol% Mn doped.

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“…It has been found that ions with the valences smaller than 4 substituting the Ti sites exhibit acceptor character with charge deficiency compensated by doubly ionized oxygen vacancies [1,18]. Among the 3d elements Co is known to influence the elastic and the dielectric properties of the BaTiO 3 -based ceramics [2,19,20].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2013

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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 .

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Electron paramagnetic resonance of three manganese centers in reduced SrTiO3

Cited by 117 publications

References 21 publications

Defect structure of oxide ferroelectrics—valence state, site of incorporation, mechanisms of charge compensation and internal bias fields

Defect structure of oxide ferroelectrics—valence state, site of incorporation, mechanisms of charge compensation and internal bias fields

Mn Effect on Nonlinear and Structural Properties of <110> Oriented PZN-4.5PT Single Crystals

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

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Electron paramagnetic resonance of three manganese centers in reduced SrTiO3

Cited by 117 publications

References 21 publications

Defect structure of oxide ferroelectrics—valence state, site of incorporation, mechanisms of charge compensation and internal bias fields

Defect structure of oxide ferroelectrics—valence state, site of incorporation, mechanisms of charge compensation and internal bias fields

Mn Effect on Nonlinear and Structural Properties of &lt;110&gt; Oriented PZN-4.5PT Single Crystals

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

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Mn Effect on Nonlinear and Structural Properties of <110> Oriented PZN-4.5PT Single Crystals