Structural refinement, optical and microwave dielectric properties of BaZrO3

Parida, S.; Rout, S. K.; Cavalcante, L. S.; Sinha, E.; Li, Máximo Siu; Subramanian, V.; Gupta, Nisha; Gupta, Vibha Rani; Varela, José Arana; Longo, Elson

doi:10.1016/j.ceramint.2011.10.054

Cited by 114 publications

(56 citation statements)

References 68 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The obtained values are 3.13, 3.18, 3.15, 3.20 eV, which are similar to the values reported by Parida et al [24] (around 3.55 eV). These values are within the range already reported in the literature [22,23] for pure BZ, 3.8-4.8 eV.…”

Section: Resultssupporting

confidence: 81%

“…Recently, the use of microwave heating was proven to be effective for ceramic compounds in the field of powder preparation with both expected and unexpected merits: e.g., kinetic enhancement, low reaction temperature, time reduction, control of the overall particle size and aggregation process as well as new and interesting properties. [22][23][24][25][26][27][28][29][30][31] On the other hand, further research by our group has significantly expanded our efforts to demonstrate that the MWHT method is one of the most efficient, versatile, and highly cost-effective approaches to obtain crystalline, single-phase micro and/or nanoscale materials at lower temperatures and shorter reaction times but with little residual impurities (normally \1 ppm) [29][30][31][32]. The low cost and convenience of the process, good reproducibility, high yield and clean reactions of the present synthetic method provide an incentive to scale it up for industrial production.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Photoluminescence of BaZrO3 explained by a order/disorded transformation

Aguiar

Simões

Paskocimas

et al. 2015

J Mater Sci: Mater Electron

Self Cite

View full text Add to dashboard Cite

A hydrothermal (HTMW) microwave method was used to synthesize ordered-disordered BaZrO 3 (BZ) nanoparticles at temperature of 140°C with times ranging from 15 min to 2 h. X-ray diffraction results verified the formation of BZ crystallites at a soaking time of 2 h while infrared data showed no traces of carbonate. Field emission scanning microcopy revealed a homogeneous size distribution of nanometric BZ powders. HTMW produced nanoparticles of pure BZ phase, with a size ranging from 40 to 80 nm. These results are in agreement with Raman scattering values which show that the HTMW synthesis route is rapid and cost effective. This method could be used as an alternative to obtain BZ nanoparticles as compared to other chemical methods. Intense photoluminescence in disordered BZ powders was observed at room temperature. The key of mystery of the intense PL emission is related to order-disorder structural in BZ lattice.

show abstract

Section: Resultssupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Photoluminescence of BaZrO3 explained by a order/disorded transformation

Aguiar

Simões

Paskocimas

et al. 2015

J Mater Sci: Mater Electron

Self Cite

View full text Add to dashboard Cite

show abstract

“…This spectrum is similar to PL emission profile [16,17] and is typical for multiphonon and multilevel process, i.e., a system in which the electronic relaxation occurs by several paths, including numerous energy levels within the band gap [7]. According to [16][17][18][19][20]26] Figure 2 illustrates CL spectra of nano-BZO samples, both as prepared and annealed during 2 h at different temperatures (up to 800 °C). These results demonstrate hightemperature stability of CL intensity and spectral composition, contrary to the results published earlier [16][17][18][19][20]26].…”

Section: Characteristics Of Initial Bzo Powdersmentioning

confidence: 84%

“…According to [16][17][18][19][20]26] Figure 2 illustrates CL spectra of nano-BZO samples, both as prepared and annealed during 2 h at different temperatures (up to 800 °C). These results demonstrate hightemperature stability of CL intensity and spectral composition, contrary to the results published earlier [16][17][18][19][20]26]. This behavior is attributed to micro-BZO (d < 10 μm) powders.…”

Section: Characteristics Of Initial Bzo Powdersmentioning

confidence: 99%

Cathodoluminescence characterization of polystyrene-BaZrO3 hybrid composites

Savchyn¹,

Попов²,

Aksimentyeva³

et al. 2016

Low Temperature Physics

View full text Add to dashboard Cite

The radiation properties and the electronic structure of hybrid composites based on suspension polystyrene (PS) and nanocrystals of BaZrO 3 (BZO) (d < 50 nm) have been studied using luminescent spectroscopy and x-ray analysis. A strong cathodoluminescence (CL) in BZO-nanocrystals is observed in temperature range 80-293 K. It is modified in BZO-PS composites: both the low-and a high-energy bands (near 4 eV) appear, together with a significant reduction in the CL intensity. A decrease of the lattice parameter а for BZO phase in the composite and the modification of CL spectra indicate for changes in the nanocrystalline structure induced by the polymer.

show abstract

“…The TE 01δ resonance mode has been found most suitable for the real part of the relative dielectric constant (ε r ). A gain/loss factor (tan δ) of the specimen could be obtained from the measured resonance frequency (f r ) and unloaded quality factor (Q 0 ) for the TE 01δ resonance mode [9,63]. The relative dielectric constant and loss factors were calculated using the following formula [56]: Figure 1.…”

Section: Microwave Dielectric Constant Measurementsmentioning

confidence: 99%

MICROWAVE DIELECTRIC PROPERTIES OF NI0.2CUXZN0.8-XFE2O4 FOR APPLICATION IN ANTENNA

Kumar¹,

Gupta²,

Rout³

2014

PIER B

View full text Add to dashboard Cite

Abstract-Structural, vibrational and microwave dielectric properties of Nickel-Copper-Zinc ferrite (Ni 0.2 Cu x Zn 0.8−x Fe 2 O 4 ) ceramics have been presented in this paper. Samples have been prepared using conventional auto-combustion method. The X-ray diffraction (XRD) results confirmed the ferrite samples to be of cubic spinel structure, which further was validated by Fourier transform infrared (FT-IR) and Raman spectroscopy. The relative permittivity (ε r ) increased from 7.474 to 8.132 with successive increase in Cu content. The observed and calculated permittivity using ClausiusMossoitti relation have been in good agreement. The temperature coefficient of resonant frequency (τ f ) decreased from −75.85 ppm/ • C to −32.12 ppm/ • C with increase in successive Cu content. The relative permeability (µ r ) have been calculated by using the Nicholson-Ross-Weir conversion technique. Using Ni 0.2 Cu 0.2 Zn 0.6 Fe 2 O 4 sample the ferrite resonator antennas have been designed in three different shapes. The experimental and theoretical characteristics of the antennas have been compared and a good agreement has been achieved.

show abstract

Structural refinement, optical and microwave dielectric properties of BaZrO3

Cited by 114 publications

References 68 publications

Photoluminescence of BaZrO3 explained by a order/disorded transformation

Photoluminescence of BaZrO3 explained by a order/disorded transformation

Cathodoluminescence characterization of polystyrene-BaZrO3 hybrid composites

MICROWAVE DIELECTRIC PROPERTIES OF NI<sub>0.2</sub>CU<sub>X</sub>ZN<sub>0.8-X</sub>FE<sub>2</sub>O<sub>4</sub> FOR APPLICATION IN ANTENNA

Contact Info

Product

Resources

About