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Dielectric and Raman studies of Ba0.06(Na1/2Bi1/2)0.94TiO3–NaNbO3 ceramics

Sumit K. Roy
Sumit K. Roy
, 
S. Chaudhuri
S. Chaudhuri
, 
R.K. Kotnala
R.K. Kotnala
, 
D.K. Singh
D.K. Singh
, 
B.P. Singh
B.P. Singh
, 
S.N. Singh
S.N. Singh
, 
K.P. Chandra
K.P. Chandra
 e 
K. Prasad
K. Prasad
   | 18 giu 2016
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Article Category: Research Article
Pubblicato online: 18 giu 2016
Pagine: 437 - 445
Ricevuto: 27 nov 2015
Accettato: 28 gen 2016
DOI: https://doi.org/10.1515/msp-2016-0041
© Wroclaw University of Technology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Fig. 1

(a) XRD patterns of (1 – x)Ba0.06(Na1/2Bi1/2)0.94 TiO3–xNaNbO3 ceramics at room temperature and (b) XRD patterns of (1 – x)Ba0.06(Na1/2Bi1/2)0.94TiO3–xNaNbO3 ceramics in the selected regions of 2θ(45.5° to 48°).
(a) XRD patterns of (1 – x)Ba0.06(Na1/2Bi1/2)0.94 TiO3–xNaNbO3 ceramics at room temperature and (b) XRD patterns of (1 – x)Ba0.06(Na1/2Bi1/2)0.94TiO3–xNaNbO3 ceramics in the selected regions of 2θ(45.5° to 48°).

Fig. 2

SEM images of (1 – x)Ba0.06(Na1/2Bi1/2)0.94 TiO3–xNaNbO3 ceramics.
SEM images of (1 – x)Ba0.06(Na1/2Bi1/2)0.94 TiO3–xNaNbO3 ceramics.

Fig. 3

Raman spectra of (a) Ba0.06(Na1/2Bi1/2)0.94 TiO3 and peaks fitted with Gaussian components, (b) Raman spectra of NaNbO3 can be deconvoluted with Lorentzian components contrary to Ba0.06(Na1/2Bi1/2)0.94TiO3, NaNbO3 requires multiple peaks and (c) shows a change in the Raman spectra with increasing NaNbO3 doping % in Ba0.06(Na1/2Bi1/2)0.94TiO3 matrix.
Raman spectra of (a) Ba0.06(Na1/2Bi1/2)0.94 TiO3 and peaks fitted with Gaussian components, (b) Raman spectra of NaNbO3 can be deconvoluted with Lorentzian components contrary to Ba0.06(Na1/2Bi1/2)0.94TiO3, NaNbO3 requires multiple peaks and (c) shows a change in the Raman spectra with increasing NaNbO3 doping % in Ba0.06(Na1/2Bi1/2)0.94TiO3 matrix.

Fig. 4

Frequency dependence of dielectric constant of (1 – x)Ba0.06(Na1/2Bi1/2)0.94TiO3–xNaNbO3 ceramics at room temperature.
Frequency dependence of dielectric constant of (1 – x)Ba0.06(Na1/2Bi1/2)0.94TiO3–xNaNbO3 ceramics at room temperature.

Fig. 5

Temperature dependence of dielectric constant and loss tangent of (1 – x)Ba0.06(Na1/2Bi1/2)0.94TiO3– xNaNbO3 ceramics at different frequencies (a) 1 kHz (b) 10 kHz (c) 100 kHz (d) 1MHz.
Temperature dependence of dielectric constant and loss tangent of (1 – x)Ba0.06(Na1/2Bi1/2)0.94TiO3– xNaNbO3 ceramics at different frequencies (a) 1 kHz (b) 10 kHz (c) 100 kHz (d) 1MHz.

Fig. 6

The modified Curie-Weiss plots ln(1/∊–1/∊m) vs. ln(T–Tm) for (1 – x)Ba0.06(Na1/2Bi1/2)0.94 TiO3–xNaNbO3 ceramics for x = 0, x = 0.50, x = 1.0 at 1 kHz.
The modified Curie-Weiss plots ln(1/∊–1/∊m) vs. ln(T–Tm) for (1 – x)Ba0.06(Na1/2Bi1/2)0.94 TiO3–xNaNbO3 ceramics for x = 0, x = 0.50, x = 1.0 at 1 kHz.

Lattice parameters of the (1 – x)Ba0.06(Na1/2Bi1/2)0.94TiO3–xNaNbO3 (0 ⩽ x ⩽ 1) ceramics.

Parameters / x0.000.050.100.250.500.750.900.951.00
a [Å]3.90373.89793.90333.93.8983.9353.9093.9333.95
b [Å]3.90373.89793.90333.93.8983.9123.873.9123.84
c [Å]3.8983.9033.9093.90383.9073.883.8853.883.909
c/a0.9981.00131.00141.00091.00230.98600.99380.98650.9896
Cell volume [Å 3]58.8659.2959.5659.3859.3659.758.7459.759.34
Crystal systemR / TR / TR / TR / TR / T / OOOOO

Tolerance factor, average A-and B-site ionic radius of (1 – x)Ba0.06(Na1/2Bi1/2)0.94TiO3–xNaNbO3 ceramics.

xTolerance factor (t)Average ionic radius of A site [Å]Average ionic radius of B site [Å]
0.000.9501.3000.605
0.050.9511.3040.607
0.100.9521.3090.609
0.250.9551.3220.614
0.500.9601.3450.623
0.750.9651.3670.631
0.900.9681.3810.637
0.950.9691.3850.638
1.000.9701.3900.640
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