Dielectric relaxation and predominance of NSPT and OLPT conduction processes in Ba0.9Sr0.1TiO3

Zaitouni, H.; Hajji, L.; Choukri, E.; Mezzane, D.; Abkhar, Z.; Essaleh, L.; Alimoussa, A.; Marssi, M. El; Luk’yanchuk, I.

doi:10.1016/j.spmi.2017.11.060

Cited by 5 publications

(6 citation statements)

References 21 publications

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“…1(b) is consistent with the coexistence of structural phases in intermediate compositions from tetragonal to cubic phases. Moreover in Fig.1(b), it can be seen that in BSTS-x ceramics with x = 0.00 and 0.02 (200) reflection peak splits into (200) and (002) peaks that are fingerprints of tetragonal (T) phase, which is similar to previous reports [13,14]. For 0.05 x  0.07, the phase structure shifts from the (T) phase to the coexistence of Orthorhombic (O) and (T) phases.…”

Section: X-ray Diffraction Analysissupporting

confidence: 87%

Structural, dielectric, ferroelectric and tuning properties of Pb-free ferroelectric Ba0.9Sr0.1Ti1-xSnxO3

Zaitouni

Hajji

Mezzane

et al. 2020

Ceramics International

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A series of Pb-free ferroelectric materials Ba0.9Sr0.1Ti1-xSnxO3 (BSTS-x) with 0  x  0.15 was successfully prepared via solid-state reaction method. The effect of Sn substitution on the crystal structure, microstructure, dielectric behavior, ferroelectric and tunable features of BSTS-x ceramics were systematically investigated. Room temperature (RT) x-ray diffraction (XRD) analysis using the Rietveld refinement method reveals that all the synthesized BSTS-x ceramics were well crystallized into single perovskite structure. The results show a tetragonal phase for 0.00  x  0.02, which evolves to orthorhombic and tetragonal coexisting phases for 0.05  x  0.07. The composition x = 0.10 showed a mixture of tetragonal, orthorhombic and rhombohedral phases at RT, while a single cubic phase is observed for x = 0.15. The crystal phases determined by XRD were confirmed by Raman spectroscopy. Enhanced dielectric permittivity with a maximum value of ′~ 35000 is observed for x = 0.10 at RT. The ferroelectric behavior of BSTS-x ceramics was investigated through polarization hysteresis loops and tunability measurements. High tunability of 63% at RT and under the low DC-applied electric field of 1.40 kV/cm is achieved for x = 0.10.

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Section: X-ray Diffraction Analysissupporting

confidence: 87%

Structural, dielectric, ferroelectric and tuning properties of Pb-free ferroelectric Ba0.9Sr0.1Ti1-xSnxO3

Zaitouni

Hajji

Mezzane

et al. 2020

Ceramics International

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“…1(a) shows room temperature XRD patterns of BSTS samples calcined at 950°C. All the samples show single perovskite phase without any traces of impurities as previously reported in several references [20,25], suggesting the substitution of Ti 4+ by Sn 4+ in the BST lattice. With increasing Sn content, the diffraction peaks shift towards lower diffraction angles (2) ( Fig.…”

Section: Structural Propertiessupporting

confidence: 82%

“…BST is a ferroelectric material that exhibits high dielectric constant (ε') and has a tunable Curie temperature (Tc) by modifying the mole fraction of Ba 2+ /Sr 2+ . In particular, the composition Ba0.9Sr0.1TiO3 studied in our earlier work [20] shows a ferroelectric properties with a phase transition at TC = 95°C.…”

Section: Introductionmentioning

confidence: 71%

Direct electrocaloric, structural, dielectric, and electric properties of lead-free ferroelectric material Ba0.9Sr0.1Ti1-xSnxO3 synthesized by semi-wet method

Zaitouni

Hajji

Mezzane

et al. 2019

Physica B: Condensed Matter

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By using the semi-wet synthesis method, lead-free ferroelectric materials Ba0.9Sr0.1Ti1-xSnxO3 with x = 0, 0.02, 0.05, and 0.10 (abbreviated as BSTS) were prepared and their structural, electric and electrocaloric properties were investigated. The X-ray diffraction (XRD) patterns show that the samples calcined at 950°C have well crystallized into perovskite structure suggesting the substitution of Ti 4+ by Sn 4+ in BST lattice. With increasing content of Sn, the enhancement of the dielectric permittivity was observed for (0≤x≤0.05) and the ferroelectric transition temperature (TC) was found to shift towards the room temperature (TC = 20°C for x = 0.10). Direct measurements of the electrocaloric effect (ECE) were performed on all samples by using the highresolution calorimeter. It is found that Ba0.9Sr0.1Ti0.95Sn0.05O3 exhibits a high ECE temperature change of TEC = 0.188 K at an applied electric field of only 7 kV/cm. Impedance spectrum analysis of all the samples performed in the temperature range of 300-360°C reveals the existence of two relaxation contributions related to the grain and grain boundaries that are well separated in frequency. Activation energies of conduction and relaxation processes were deduced for both contributions in order to determine the conduction mechanism of the studied compositions.2

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“…[1][2][3][4] In the last two decades, more than %650 articles have been published on CP materials (Figure 1a), exemplifying scientific and technological inquisitiveness toward the utilization of dielectric CP materials for energy storage applications. The performance index of dielectric materials and subsequent selection criteria can be based on dielectric permittivity (ε 0 ) and loss (tan δ) [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] as presented in the Ragone chart ( Figure 1b). CP values are exhibited by ferroelectric and antiferroelectric materials with moderate-to-high tan δ values.…”

Section: Introductionmentioning

confidence: 99%

“…a) Number of publications on CP in the year 2000–2020 (database from Web of Science) and b) Ragone chart showing the categorization of dielectric materials based on dielectric permittivity ( ε ′) and dielectric loss (tan δ ) (reproduced from refs. [5‐20]).…”

Section: Introductionmentioning

confidence: 99%

Tailorable Dielectric Performance of Niobium‐Modified Poly(hydridomethylsiloxane) Precursor‐Derived Ceramic Nanocomposites

Thiyagarajan

Koroleva

Filimonov

et al. 2020

Physica Status Solidi (a)

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The low‐frequency dielectric behavior of in situ crystallized and stabilized nanocrystalline t‐NbO2 in amorphous silicon oxycarbide (SiOC) ceramic nanocomposites derived from niobium‐modified poly(hydridomethylsiloxane) (PHMS) is reported. Commercially available PHMS is modified using Nb(OC2H5)5 via chemical and mechanical mixing route. It is observed that the synthesis route and heat‐treatment temperatures significantly affect the crystallization of the ceramic phases, where c‐NbC and t‐NbO2 in amorphous SiOC are formed through chemical and mechanical modification route, respectively. The variation in dielectric permittivity and loss at room temperature with respect to ceramic phases is comprehensively investigated. In contrast to amorphous SiOC ceramics derived from PHMS (ε′ = 100.0 at 1 Hz), t‐NbO2 in amorphous SiOC ceramic exhibits colossal dielectric permittivity (ε′ = 5.0 × 105 at 1 Hz) with low loss (tan δ < 3.0). This is attributed to an interfacial charge polarization and in situ growth of insulator/semiconductor/insulator ceramic phases in amorphous SiOC ceramic nanocomposites.

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Dielectric relaxation and predominance of NSPT and OLPT conduction processes in Ba0.9Sr0.1TiO3

Cited by 5 publications

References 21 publications

Structural, dielectric, ferroelectric and tuning properties of Pb-free ferroelectric Ba0.9Sr0.1Ti1-xSnxO3

Structural, dielectric, ferroelectric and tuning properties of Pb-free ferroelectric Ba0.9Sr0.1Ti1-xSnxO3

Direct electrocaloric, structural, dielectric, and electric properties of lead-free ferroelectric material Ba0.9Sr0.1Ti1-xSnxO3 synthesized by semi-wet method

Tailorable Dielectric Performance of Niobium‐Modified Poly(hydridomethylsiloxane) Precursor‐Derived Ceramic Nanocomposites

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