Structure and dielectric properties of solid solutions Bi7Ti4 + x W x Ta1–2x O21 (x = 0–0.5)

Zubkov, S. V.; Власенко, В. Г.; Shuvaeva, V. A.; Shevtsova, S. I.

doi:10.1134/s1063783416010352

Cited by 8 publications

(6 citation statements)

References 23 publications

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“…Figure 9 represents the real (ε ) and imaginary (ε ) parts. The scattering of phonons and the overlap of peaks make the real part (ε = 6.83) less than the measured dielectric constant (ε r = 10.04) [37][38][39]. Figure 9c shows the observed dielectric loss (2.16 × 10 −4 ) in the same order of magnitude as the measured dielectric loss (1.72 × 10 −4 ), indicating that phonon vibration affects dielectric loss.…”

Section: Resultsmentioning

confidence: 84%

Effects of LiF-Addition on Sintering Behavior and Dielectric Response of LaPO4 Ceramics at Microwave and Terahertz Frequency for LTCC Applications

Wang

Zhang

et al. 2023

Crystals

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This paper reports on the successful preparation of LaPO4-x wt.% LiF (x = 0–5) ceramics using the traditional solid-state reaction method. The crystal structures, sintering behaviors, and dielectric response at microwave and terahertz frequencies were investigated. XRD results indicate that all the diffraction peaks were attributed to LaPO4, and no secondary phase was observed. Rietveld refinement was conducted to analyze the variation of the crystal structure of LaPO4-x wt.% LiF. SEM indicates that the addition of LiF significantly decreased the grain size while increasing the apparent density of the ceramics. When x = 3, the optimum microwave dielectric properties εr = 10.03, Q × f = 81,467 GHz, and τf = −43.79 ppm/°C were achieved in LaPO4-3 wt.% LiF ceramic at 750 °C. The infrared reflectance spectrum and terahertz time-domain spectroscopy were analyzed and compared with the dielectric properties measured at microwave frequency to investigate the inherent dielectric response. The findings indicate that the dielectric constant attributed to ionic displacement polarization and oxygen vacancy is an essential factor affecting dielectric loss. Moreover, it is worth noting that the LaPO4-3 wt.% LiF ceramic demonstrates excellent compatibility with silver powders, suggesting its immense potential as a dielectric material in LTCC applications.

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Section: Resultsmentioning

confidence: 84%

Effects of LiF-Addition on Sintering Behavior and Dielectric Response of LaPO4 Ceramics at Microwave and Terahertz Frequency for LTCC Applications

Wang

Zhang

et al. 2023

Crystals

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“…The Curie temperatures T c of the studied APs increase with a decrease in the unit cell parameters a and b and its volume V and a decrease in parameter c. This dependence is directly related to the correlation between the tolerance-factor and the value of T C characteristic of APs. 19,21 Tolerance factor t was introduced by Goldschmidt 34 as a parameter that determines the ionic packing in cubic cells:…”

Section: Resultsmentioning

confidence: 99%

“…[12][13][14][15][16] Bi 3 TiNbO 9 (BTNO) with m ¼ 2 that consists of (Bi 2 O 2 ) 2þ layers between which there are (BiTiNbO 7 ) 2À layers is a promising material for fabricating high-temperature piezoelectric sensors because of their very high Curie temperature T C (914-921 ○ C), 5,17 despite the fact that the piezoelectric modulus of BTNO ceramic is fairly low (d 33 < 7 pC/N). 18 Numerous examples [19][20][21][22][23][24][25][26][27][28][29][30][31] showed that replacements of atoms in A and also in B positions of an APs crystal lattice led to the change in the structure, the dielectric properties and significantly influenced the polarization processes in these compounds. In this work, we have synthesized a number of new solid solutions of layered perovskite-like oxides Bi 3Àx Gd x TiNbO 9 (x ¼ 0, 0.1, 0.2, 0.3) in which proportions between amounts of Bi 3þ and Lu 3þ ions entering in position A was varied and have studied their crystal lattices, the dielectric and electrophysical characteristics.…”

Section: Introductionmentioning

confidence: 99%

Crystal structure and dielectric properties of layered perovskite-like solid solutions Bi3−xGd_xTiNbO₉ (x=0, 0.1, 0.2, 0.3) with high Curie temperature

Zubkov

2020

J. Adv. Dielect.

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The Aurivillius phases (APs) [Bi2O2][Formula: see text][[Formula: see text][Formula: see text]][Formula: see text] are well-known ferroelectrics with high Curie temperatures. High-temperature piezoceramics [Formula: see text]GdxTiNbO9(BiGdTiNb, [Formula: see text], 0.1, 0.2, 0.3) were prepared by a solid-state reaction method. The structural and electrophysical characteristics of BiGdTiNb ceramics have been studied. According to the data of powder X-ray diffraction, all the compounds are single-phase with the structures of two-layer APs ([Formula: see text]) with the orthorhombic crystal lattice (space group [Formula: see text]). The temperature dependence of the relative permittivity [Formula: see text] (T) of the compounds was measured and showed that the Curie temperature of perovskite-like oxides [Formula: see text]GdxTiNbO9 increases linearly with an increase in the substitution parameter [Formula: see text] to [Formula: see text]C. The activation energies of charge carriers have been found in different temperature ranges.

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“…Bi 3 TiNbO 9 (BTNO) with m = 2 that consists of (Bi 2 O 2 ) 2+ layers between which there are (BiTiNbO 7 ) 2layers [26] is a promising material for fabricating high temperature piezoelectric sensors because of their very high Curie temperature T C (914-921 • C) [14,15], despite the fact that the piezoelectric modulus of BTNO ceramic is fairly low (d 33 < 7 pC/N) [27]. Numerous examples [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42] showed that replacements of atoms in Aand also in B-positions of an AP's crystal lattice led to a change in the structure, the dielectric properties and significantly influenced the polarization processes in these compounds.…”

Section: Introductionmentioning

confidence: 99%

The Structural and Dielectric Properties of Bi3−xNdxTi1.5W0.5O9 (x = 0.25, 0.5, 0.75, 1.0)

2022

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A new series of layered perovskite-like oxides Bi3−xNdxTi1.5W0.5O9 (x = 0.25, 0.5, 0.75, 1.0) was synthesized by the method of high-temperature solid-state reaction, in which partial substitution of bismuth (Bi) atoms in the dodecahedra of the perovskite layer (A-positions) by Nd atoms takes place. X-ray structural studies have shown that all compounds are single-phase and have the structure of Aurivillius phases (APs), with close parameters of orthorhombic unit cells corresponding to space group A21am. The dependences of the relative permittivity ε/ε0 and the tangent of loss tgσ at different frequencies on temperature were measured. The piezoelectric constant d33 was measured for Bi3−xNdxTi1.5W0.5O9 (x = 0.25, 0.5, 0.75) compounds of the synthesized series.

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Structure and dielectric properties of solid solutions Bi7Ti4 + x W x Ta1–2x O21 (x = 0–0.5)

Cited by 8 publications

References 23 publications

Effects of LiF-Addition on Sintering Behavior and Dielectric Response of LaPO4 Ceramics at Microwave and Terahertz Frequency for LTCC Applications

Effects of LiF-Addition on Sintering Behavior and Dielectric Response of LaPO4 Ceramics at Microwave and Terahertz Frequency for LTCC Applications

Crystal structure and dielectric properties of layered perovskite-like solid solutions Bi3−xGd_xTiNbO₉ (x=0, 0.1, 0.2, 0.3) with high Curie temperature

The Structural and Dielectric Properties of Bi3−xNdxTi1.5W0.5O9 (x = 0.25, 0.5, 0.75, 1.0)

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Structure and dielectric properties of solid solutions Bi7Ti4 + x W x Ta1–2x O21 (x = 0–0.5)

Cited by 8 publications

References 23 publications

Effects of LiF-Addition on Sintering Behavior and Dielectric Response of LaPO4 Ceramics at Microwave and Terahertz Frequency for LTCC Applications

Effects of LiF-Addition on Sintering Behavior and Dielectric Response of LaPO4 Ceramics at Microwave and Terahertz Frequency for LTCC Applications

Crystal structure and dielectric properties of layered perovskite-like solid solutions Bi3−xGdxTiNbO9 (x=0, 0.1, 0.2, 0.3) with high Curie temperature

The Structural and Dielectric Properties of Bi3−xNdxTi1.5W0.5O9 (x = 0.25, 0.5, 0.75, 1.0)

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Crystal structure and dielectric properties of layered perovskite-like solid solutions Bi3−xGd_xTiNbO₉ (x=0, 0.1, 0.2, 0.3) with high Curie temperature