Study of the structural and dielectric properties of Bi2O3 and PbO addition on BiNbO4 ceramic matrix for RF applications

Almeida, J.S.; Fernandes, T. S. M.; Sales, A. J. M.; Silva, M. A. S.; Júnior, G. F. M. P.; Rodrigues, H. O.; Sombra, A. S. B.

doi:10.1007/s10854-010-0247-z

Cited by 10 publications

(2 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In 2011, Almeida et al [18] sintered BiNbO 4 ceramics with different amounts of PbO and Bi 2 O 3 , by the solid-state reaction method. The dielectric characterisation was performed with the impedance spectroscopy technique, in the frequency range of 10 2 -10 8 Hz.…”

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

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

show abstract

“…Since then, in order to obtain higher densification, better dielectric properties, and reduce the sintering temperature, various attempts have been undertaken to improve the bismuth niobate properties as a microwave dielectric ceramic [4]. 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

The stability and dielectric performance of BiNbO₄ prepared by citrate method assisting sintering process

Zhai

Chen

Luo

et al. 2016

Physica Status Solidi (a)

View full text Add to dashboard Cite

Low-temperature b phase BiNbO 4 powders (denoted as Low-b) were prepared by a citrate method using home-made watersoluble niobium precursors. The stability of Low-b was systematically investigated from the aspects including calcination temperature, incubation time, and stress existing in pellets. Pure Low-b can be obtained between 700 and 750 8C and the crystal evolution of Low-b has not completed yet, compared with high-temperature b phase. Low-b is kinetically stable and no phase transition occurs when increasing the incubation time below 750 8C. Above 750 8C, both the calcination temperature and incubation time can induce the abnormal phase transition from Low-b to a phase; also, stress existing in pellets can effectively activate the phase transition of Low-b. We can conclude that the Low-b is thermodynamically unstable, while in kinetics, Low-b is stable. The dielectric properties of BiNbO 4 ceramics were investigated to analyze the influence of phase of BiNbO 4 powders precursors, especially the effect of phase transition of Low-b. It's found that BiNbO 4 powders firstly calcined at 700 8C is the best precursor to prepare dense ceramics with uniform grain size and the dielectric permittivity and dielectric loss of BiNbO 4 ceramics prepared at 1000 8C is 56.6 and 0.001 at 10 kHz, respectively.

show abstract

Study of the structural and dielectric properties of Bi2O3 and PbO addition on BiNbO4 ceramic matrix for RF applications

Cited by 10 publications

References 18 publications

Dielectric Properties of Bismuth Niobate Ceramics

Dielectric Properties of Bismuth Niobate Ceramics

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

The stability and dielectric performance of BiNbO₄ prepared by citrate method assisting sintering process

Contact Info

Product

Resources

About

Study of the structural and dielectric properties of Bi2O3 and PbO addition on BiNbO4 ceramic matrix for RF applications

Cited by 10 publications

References 18 publications

Dielectric Properties of Bismuth Niobate Ceramics

Dielectric Properties of Bismuth Niobate Ceramics

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

The stability and dielectric performance of BiNbO4 prepared by citrate method assisting sintering process

Contact Info

Product

Resources

About

The stability and dielectric performance of BiNbO₄ prepared by citrate method assisting sintering process