Compositional effects on structural, dielectric, ferroelectric and transport properties of Ba 1−x (Bi 0.5 Li 0.5 ) x TiO 3 ceramics

Rawat, Meera; Yadav, K. L.

doi:10.1016/j.matchemphys.2014.08.031

Cited by 22 publications

(9 citation statements)

References 39 publications

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“…Several Bi M O 3 compounds, for example, (Bi 1/2 Li 1/2 )TiO 3 , Bi(Mg 2/3 Nb 1/3 )O 3 , Bi(Mg 1/2 Ti 1/2 )O 3 , Bi(Zn 2/3 Nb 1/3 )O 3 , Bi(Zn,Sc,Ti)O 3 have been shown to exhibit the same effect on the electrical properties when added to BaTiO 3 . Studies to determine the type of charge carrier in these solid solutions are scarce, however, some of them have been shown to exhibit a simultaneous p‐type to n‐type transition of majority charge carriers, along with resistivity enhancement .…”

Section: Resultsmentioning

confidence: 99%

“…Charge compensation was accomplished with < 20 eV electrons. 3,13,[46][47][48][49][50][51] Studies to determine the type of charge carrier in these solid solutions are scarce, however, some of them have been shown to exhibit a simultaneous p-type to n-type transition of majority charge carriers, along with resistivity enhancement. 2,14,15 This article primarily focuses on BT-BZT ceramics with an aim of understanding the transport mechanisms and to establish the defect chemistry for the BT-BiMO 3 class of materials in general.…”

Section: Methodsmentioning

confidence: 99%

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Defect mechanisms in BaTiO₃‐BiMO₃ ceramics

et al. 2018

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Often, addition of BiMO3 to BaTiO3 (BT) leads to improvement in resistivity with a simultaneous shift to n‐type conduction from p‐type for BT. In considering one specific BiMO3 composition, that is, Bi(Zn1/2Ti1/2)O3 (BZT), several prospective candidates for the origin of this n‐type behavior in BT‐BZT were studied—loss of volatile cations, oxygen vacancies, bismuth present in multiple valence states and precipitation of secondary phases. Combined x‐ray and neutron diffraction, prompt gamma neutron activation analysis and electron energy loss spectroscopy suggested much higher oxygen vacancy concentration in BT‐BZT ceramics (>4%) as compared to BT alone. X‐ray photoelectron spectroscopy and x‐ray absorption spectroscopy did not suggest the presence of bismuth in multiple valence states. At the same time, using transmission electron microscopy, some minor secondary phases were observed, whose compositions were such that they could result in effective donor doping in BT‐BZT ceramics. Using experimentally determined thermodynamic parameters for BT and slopes of Kröger‐Vink plots, it has been suggested that an ionic compensation mechanism is prevalent in these ceramics instead of electronic compensation. These ionic defects have an effect of shifting the conductivity minimum in the Kröger‐Vink plots to higher oxygen partial pressure values in BT‐BZT ceramics as compared to BT, resulting in a significantly higher resistivity values in air atmosphere and n‐type behavior. This provides an important tool to tailor transport properties and defects in BT‐BiMO3 ceramics, to make them better suited for dielectric or other applications.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Defect mechanisms in BaTiO₃‐BiMO₃ ceramics

et al. 2018

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“…Ferroelectric properties are affected by composition, its homogeneity, defects, external field and orientation of domains, which contribute to the materials response. Uniformly oriented domain structures actually increases the ferroelectric properties [30]. It is known that grain size plays a vital role on the observed polarization and ferroelectric behavior.…”

Section: Ferroelectric Behaviourmentioning

confidence: 99%

Structural, dielectric, ferroelectric and magnetic properties of (x) CoFe2O4-(1-x) BaTiO3 composite

Manjusha¹,

Rawat²,

Yadav³

2015

IEEE Trans. Dielect. Electr. Insul.

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Composites of (x) CoFe 2 O 4 -(1-x) BaTiO 3 (for x = 0, 0.30, 0.40, 0.50) synthesized via solid state reaction method are reported. Structural analysis was carried out by X-ray diffraction analysis which confirms the formation of the hybrid composites with spinel phase and tetragonal phase. FESEM micrographs show closely packed microstructure with grain sizes varying in the range of 480 nm-680 nm. Variation of dielectric constant with temperature at three fixed frequencies (1 kHz, 50 kHz and 100 kHz) was studied and it was found that the value of dielectric constant increases with an increase in the ferrite content. In ferroelectric study the values of coercive field (2E c ) increased with increasing ferrite content. The magnetic properties such as saturation magnetization (M s ) and magnetic moment (μ B ) calculated from the magnetic hysteresis loops are found to increase with an increase in ferrite content. The magnetoelectric effect of ferroelectric/ferrite composites was studied using magnetocapacitance which gives maximum value for 50 mol% addition of ferrite.

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“…5 Bi 0.5 ) (1 À x) TiO 3 -Ba x TiO 3 ((1 À x)NBT-BTx), as an ABO 3 -type complex metal oxide with the substitution of A-site ions, has been studied by many researchers. Its electrical properties can be affected by the compositions of (1À x)NBT-BTx [25]. According to previous work [26,27], there is low dielectric loss for the (1 À x)NBTBTx at a composition around x=0.06, and the materials with low dielectric loss and high permittivity would be used for fabricating the humidity sensors with good insulating properties and reliability [28].…”

Section: Introductionmentioning

confidence: 98%