Synthesis and microwave dielectric behavior of (Bi1−xPbx)NbO4ceramics

Butee, S.P.; Kambale, K.R.; Upadhyay, Shaishav; Bashaiah, S.; Raju, K. C. James; Panda, H. S.

doi:10.1142/s2010135x16500065

Cited by 8 publications

(3 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Bismuth orthoniobate (BiNbO 4 ) is still of interest after more than half a century due to its microwave dielectric and photocatalytic properties. , BiNbO 4 ceramics containing V 2 O 5 and CuO have excellent dielectric properties, as was shown for the first time in the work revealing high values of the quality factor Q r = 4260 (at 4.3 GHz), dielectric constant ε r = 43, and the coefficient of resonant frequency t f = +38 ppm/°C. In order to obtain high-density ceramics and optimize the dielectric properties of bismuth orthoniobate, sintering additives are added and bismuth or niobium atoms are substituted hetero- and isovalently. − The low temperature of the synthesis (∼1000 °C) of bismuth orthoniobate materials promotes their use as dielectrics for multilayer microwave circuits with silver (copper) inner conductors. Thus, bismuth orthoniobate materials facilitate miniaturization of the resonant devices…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Crystal Chemistry of α-, β-, and γ-BiNbO₄ Polymorphs

et al. 2019

View full text Add to dashboard Cite

Thermal behavior of the orthorhombic (α) and triclinic (β) polymorphs of BiNbO4 was studied by the methods of high-temperature powder X-ray diffraction (HTPXRD) and differential scanning calorimetry (DCS) in the temperature range 25–1200 °C. The study revealed the sequence of thermal phase transformations and the new high-temperature modification, γ-BiNbO4, which was formed above 1001 °C and existed up to the melting temperature of BiNbO4. The incongruent melting of BiNbO4 was characterized by the formation of the cubic phase with the approximate composition Bi3NbO7. The HTPXRD method was used in this study to evaluate thermal deformations and to calculate thermal-expansion coefficients (TEC) of the three modifications of BiNbO4 (α, β, and γ). The average volumetric TECs of these three modifications were in the range 19–36 × 10–6 °C–1. The triclinic phase β-BiNbO4 demonstrated the highest anisotropy of thermal expansion. α-BiNbO4 was characterized by the minimal TEC and anisotropy, which indicated its greatest stability. The crystal structure of γ-BiNbO4 was determined at 1100 °C using powder data and was refined using the Rietveld method (the α-LaTaO4 structural type, the space group Cmc21, a = 3.95440(3) Å, b = 15.0899(1) Å, c = 5.65524(5) Å, V = 337.458(5) Å3, R wp = 4.82, R Bragg = 3.61%). The methods of thermal analysis and high-temperature powder X-ray diffraction revealed that, during the heating, bismuth orthoniobate underwent the following sequence of phase transitions: α-BiNbO4 → γ-BiNbO4 → β-BiNbO4 and β-BiNbO4 → γ-BiNbO4 → β-BiNbO4 or, at slow heating, β-BiNbO4 → (α-BiNbO4) → γ-BiNbO4 → β-BiNbO4, where γ-BiNbO4 is the high-temperature phase of bismuth orthoniobate.

show abstract

Section: Introductionmentioning

confidence: 99%

High-Temperature Crystal Chemistry of α-, β-, and γ-BiNbO₄ Polymorphs

et al. 2019

View full text Add to dashboard Cite

show abstract

“…In 2016, Butee et al [20] studied (Bi 1-x Pb x )NbO 4 samples, prepared by the solid-state reaction method, with the addition of V 2 O 5 . The dielectric post (DP) resonator technique was employed for the microwave characterisation of the samples that was performed at room temperature and at ~4-5 GHz.…”

Section: State Of the Artmentioning

confidence: 99%

Dielectric Properties of Bismuth Niobate Ceramics

Devesa¹,

Graça²,

CadillonCosta³

2018

Bismuth - Advanced Applications and Defects Characterization

View full text Add to dashboard Cite

The development of new dielectric materials that allow the reduction of size and weight of electronic components has been in the scope of the researchers. The bismuth-based dielectric ceramics are extensively studied for this purpose, namely, the bismuth niobate (BiNbO 4). The first attempt to improve BiNbO 4 occurred in 1992 when Kagata reported the microwave dielectric properties of bismuth niobate doped with the addition of oxides. This chapter will present a brief review of the several attempts that have been carried out to enhance the dielectric properties of BiNbO 4 by modifying their structure through addition, doping, or atom(s) substitution. This manuscript focuses on a case study that involves bismuth substitution by europium ions. To investigate the inclusion of europium in BiNbO 4 ceramics, (Bi 1-x Eu x)NbO 4 samples were prepared using the sol-gel method, in particular, the citrate route. The structure of the prepared samples was studied by X-ray diffraction (XRD) and Raman spectroscopy and the morphology by scanning electron microscopy (SEM). The dielectric properties were studied, in the microwave frequency range (MW), using the resonant cavity method, and in the radio frequency range (RF), with the impedance spectroscopy technique.

show abstract

“…Besides the addition of different oxides, such as CuO [6], ZnO [13], V 2 O 5 [14,15], PbO, Bi 2 O 3 [16], and Fe 2 O 3 [17], several researchers tried to improve bismuth niobate properties through the substitution of bismuth for metals or lanthanides. In order to accomplish this task, (Bi 1−x R x )NbO 4 compositions were developed and studied, where R represents different metals, such as Fe [18] or Pb [19], and different lanthanides, such as Ce, Nd, Dy, Er, La, Sm, Ta, Gd, and La [20][21][22][23][24][25].…”

mentioning

confidence: 99%

Sol-Gel Synthesis, Structural Characterization and Microwave Dielectric Properties of Bismuth Niobate Modified by Iron Inclusion

Devesa¹,

Graça²,

Costa³

2017

Recent Applications in Sol-Gel Synthesis

View full text Add to dashboard Cite

The current progress in communication technologies is leading to extensive studies on the development of miniaturized electronic devices with high electromagnetic performances, reliability, and low cost. Contributing to this purpose, the development and study of new materials, with promising electric properties in radio and microwave ranges, have been subject of our research in particular niobate-based materials. Bismuth niobate, BiNbO 4 , is a low-firing ceramic that has been studied for a variety of applications in the microelectronic industry. In this work, the microwave dielectric characterization of (Bi 1−x Fe x )NbO 4 (0.00 ≤ x ≤ 1.00) samples, prepared by the sol-gel method and heat treated at specific temperatures, is performed and related with their structure and morphology. The structural data were obtained by X-ray diffraction and Raman spectroscopy and the morphology by scanning electron microscopy. The dielectric characterization in the microwave region was made using the small perturbation theory, with a resonant cavity operating in TE 105 mode, at the frequency of 2.7 GHz. The results show that the sol-gel method has the advantage of allowing the formation of α-BiNbO 4 phase at lower temperatures when compared with conventional preparation methods, and that the inclusion of iron inhibits the formation of low-and high-temperature β-BiNbO 4 phases.

show abstract

Synthesis and microwave dielectric behavior of (Bi1−xPb_x)NbO₄ceramics

Abstract: Ceramic samples of (Bi 1ÀxPb

Cited by 8 publications

References 31 publications

High-Temperature Crystal Chemistry of α-, β-, and γ-BiNbO₄ Polymorphs

High-Temperature Crystal Chemistry of α-, β-, and γ-BiNbO₄ Polymorphs

Dielectric Properties of Bismuth Niobate Ceramics

Sol-Gel Synthesis, Structural Characterization and Microwave Dielectric Properties of Bismuth Niobate Modified by Iron Inclusion

Contact Info

Product

Resources

About

Synthesis and microwave dielectric behavior of (Bi1−xPbx)NbO4ceramics

Abstract: Ceramic samples of (Bi 1ÀxPb

Cited by 8 publications

References 31 publications

High-Temperature Crystal Chemistry of α-, β-, and γ-BiNbO4 Polymorphs

High-Temperature Crystal Chemistry of α-, β-, and γ-BiNbO4 Polymorphs

Dielectric Properties of Bismuth Niobate Ceramics

Sol-Gel Synthesis, Structural Characterization and Microwave Dielectric Properties of Bismuth Niobate Modified by Iron Inclusion

Contact Info

Product

Resources

About

Synthesis and microwave dielectric behavior of (Bi1−xPb_x)NbO₄ceramics

High-Temperature Crystal Chemistry of α-, β-, and γ-BiNbO₄ Polymorphs

High-Temperature Crystal Chemistry of α-, β-, and γ-BiNbO₄ Polymorphs