Structure composition correlation in KNN–BT ceramics – An X-ray diffraction and Raman spectroscopic investigation

Singh, Rajan; Kambale, K.R.; Kulkarni, Ajit R.; Harendranath, C.S.

doi:10.1016/j.matchemphys.2012.12.082

Cited by 44 publications

(27 citation statements)

References 12 publications

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“…It is worth noting that the PbO used for introducing Pb to BaTiO 3 unit cells possesses an orthorhombic crystal structure. A similar change in crystal symmetry has been demonstrated by Singh et al in the case of K 0.5 Na 0.5 NbO 3 -BaTiO 3 ceramics [27]. However, more detailed inferences can be drawn if the XRD data is correlated with Raman spectroscopy data.…”

Section: Resultssupporting

confidence: 78%

“…A notable increase was observed in the value of the dielectric constant at the Curie temperature from a value of 5500 for pure BaTiO 3 to 8000 and 7500 at 5 at% and 10 at% Pb substitution, respectively. This was attributed to an increase in the tetragonality (c/a ratio) of the Pb substituted samples [27]. The decrease in the value of the dielectric constant upon further addition of Pb is due to porosity present in the samples.…”

Section: Resultsmentioning

confidence: 98%

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Significant improvement in Curie temperature and piezoelectric properties of BaTiO₃with minimum Pb addition

Butee

Kambale

Ghorpade

et al. 2019

Journal of Asian Ceramic Societies

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Dense Ba 1-x Pb x TiO 3 (x = 0-0.20) samples (>90% TD) were fabricated through a solid-state reaction route involving wet ball milling for 24 h and calcination at 1150°C for 4 h, followed by sintering at 1300°C for 4 h. XRD results for all the samples revealed a tetragonal perovskite (P4mm) crystal structure. Increased substitution of Pb caused monotonic growth in the tetragonality character of the perovskite phase. Although, the value of ε r ʹ dropped from an initial value of 3000 for x = 0 (pure BaTiO 3) to 400 for x = 0.20 samples, the losses (tanδ) interestingly declined almost to half. A substantial increase in the Curie temperature from 120°C for x = 0°C to 180°C for x = 0.15 samples was noted. P-E loop analysis revealed an increase in the saturation polarization by almost 1.5 times, moreover, in the remnant polarization by six times with Pb-substitution. The d 33 values demonstrated an increase from 95 pC/N for pure BaTiO 3 samples to 220 pC/N for x = 0.15 samples.

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Section: Resultssupporting

confidence: 78%

Section: Resultsmentioning

confidence: 98%

Significant improvement in Curie temperature and piezoelectric properties of BaTiO₃with minimum Pb addition

Butee

Kambale

Ghorpade

et al. 2019

Journal of Asian Ceramic Societies

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show abstract

“…Compared with other techniques, such as etching, PFM, XRD, and optical microscopy, Raman spectroscopy is nondestructive and highly sensitive to crystal structure distortion [7]. Recently, it has been extensively adopted in the characterizations of KNN based materials [8][9][10][11][12][13][14][15][16][17][18][19][20]. However, most of the related works were performed on ceramics due to the difficulty in growing KNN based single crystals.…”

Section: Introductionmentioning

confidence: 99%

Raman spectra of (K, Na)(Nb, Ta)O3 single crystal

Sang

Yuan

Zheng

et al. 2017

Journal of Alloys and Compounds

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The Raman scattering spectra for lead-free piezoelectric single crystal (K,Na)(Nb,Ta)O 3 (KNNT) were intensively investigated to explore its crystallographic structure. For the [011] C oriented sample, 12 Raman peaks were identified from the room temperature Raman spectrum. The υ 3 , υ 4 and υ 6 modes which should be Raman silent in normal perovskites were observed due to the low symmetry (Pm) of KNNT single crystal. The temperature dependent Raman spectra indicated that the orthorhombictetragonal phase transition happened at about 68 °C, and the Curie temperature (T C) is about 225 °C. The merging of 2 υ 5 modes at T C was ascribed to the vanishing of polarization. The backscattering polarized Raman spectra of KNNT single crystals with different orientations were analyzed. The Raman modes were identified using polarized selection rules based on group theory.

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“…Among the new lead-free piezoelectric ceramics, K 0.5 Na 0.5 NbO 3 (KNN)-based ceramics have attracted much attention due to their high Curie temperature and good piezoelectric properties [4][5][6][7]. However, high density and well-sintered pure KNN-based ceramics are difficult to obtain by the conventional sintering method, since the evaporation of alkaline elements at temperatures higher than 1000°C [8].…”

Section: Introductionmentioning

confidence: 99%

Effects of sintering temperature on structure and properties of 0.98[K0.5Na0.5NbO3–LiSbO3–BiFeO3]–0.02ZnO piezoelectric ceramics

Wang

Zhao

et al. 2015

J Mater Sci: Mater Electron

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0.98{0.996 [(0.95(K 0.5 Na 0.5 )NbO 3 -0.05LiSbO 3 ] -0.004BiFeO 3 }-0.02ZnO (KNN-LS-BF-ZnO) ceramics were prepared by conventional sintering method. The effects of sintering temperature on the structure and properties of KNN-LS-BF-ZnO ceramics were studied. The results reveal that the sintering temperature has significant influence on the crystallizability and properties of KNN-LS-BF-ZnO ceramics. With the increase of sintering temperature from 1000 to 1060°C, the main phase structure of KNN-LS-BF-ZnO ceramics changes from tetragonal phase to orthorhombic phase, and the grains become smaller and more homogeneous. When the sintering temperature is below 1020°C, the maximum values of d 33 = 278 pC/N, k p = 45 %, e r = 1236 can be obtained, meanwhile the P r and the E c are higher than 22.5 lC/cm 2 and lower than 1.2 kV/mm, respectively. However, the minimum value of tand = 2.62 % will be obtained when the sintering temperature is 1040°C and the Q m value increases with the increase of sintering temperature from 1000 to 1060°C. On the whole, the KNN-LS-BF-ZnO ceramics sintered at 1010°C could obtained its best dielectric and piezoelectric properties.

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Structure composition correlation in KNN–BT ceramics – An X-ray diffraction and Raman spectroscopic investigation

Cited by 44 publications

References 12 publications

Significant improvement in Curie temperature and piezoelectric properties of BaTiO₃with minimum Pb addition

Significant improvement in Curie temperature and piezoelectric properties of BaTiO₃with minimum Pb addition

Raman spectra of (K, Na)(Nb, Ta)O3 single crystal

Effects of sintering temperature on structure and properties of 0.98[K0.5Na0.5NbO3–LiSbO3–BiFeO3]–0.02ZnO piezoelectric ceramics

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Structure composition correlation in KNN–BT ceramics – An X-ray diffraction and Raman spectroscopic investigation

Cited by 44 publications

References 12 publications

Significant improvement in Curie temperature and piezoelectric properties of BaTiO3with minimum Pb addition

Significant improvement in Curie temperature and piezoelectric properties of BaTiO3with minimum Pb addition

Raman spectra of (K, Na)(Nb, Ta)O3 single crystal

Effects of sintering temperature on structure and properties of 0.98[K0.5Na0.5NbO3–LiSbO3–BiFeO3]–0.02ZnO piezoelectric ceramics

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Significant improvement in Curie temperature and piezoelectric properties of BaTiO₃with minimum Pb addition

Significant improvement in Curie temperature and piezoelectric properties of BaTiO₃with minimum Pb addition