Thermal characterization of piezoelectric and non-piezoelectric Lead Meta-Niobate

Sahu, Kriti Ranjan; De, Uday Chand

doi:10.1016/j.tca.2008.12.028

Cited by 17 publications

(19 citation statements)

References 23 publications

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“…In the multi-step preparation [7] of PbNb 2 O 6 from PbO and Nb 2 O 5 , all firings (at 1050 • C, 1290 • C and 1270 • C, with the last step branching into quenched and slowcooled samples) have been done in palletized form. Re-grinding and re-pelletizing before each firing improved homogeneity and sample quality.…”

Section: Experimental Outlinementioning

confidence: 99%

“…Slow-cooling (S), from the tetragonal phase, leads to S PN, the non-piezoelectric rhombohedral phase. Lead meta-niobate has not been widely studied [1][2][3][4][5][6][7], the rhombohedral phase being hardly studied. So, our present and other current work [1] are on orthorhombic as well as rhombohedral samples.…”

Section: Introductionmentioning

confidence: 99%

“…Atomic bonding and molecular level structure as revealed by Fourier Transform Infra-Red spectroscopy (FTIR) greatly governs the crystallographic structure, revealed by X-Ray Diffraction (XRD). Here, XRD Rietveld analysis and the detailed structure of the final products-orthorhombic PbNb 2 O 6 and rhombohedral PbNb 2 O 6 -have been carried out and presented in view of the good quality of the present samples [1,7,8].…”

Section: Introductionmentioning

confidence: 99%

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Structural Characterization of Orthorhombic and Rhombohedral Lead Meta-Niobate Samples

Chakraborty

Sahu

et al. 2010

Integrated Ferroelectrics

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The meta-stable orthorhombic phase of lead meta-niobate (PbNb 2 O 6 ), as obtained by quenching, is piezoelectric, but difficult to prepare in pure state as a few competing phases like the non-piezoelectric rhombohedral PbNb 2 O 6 tend to form during the preparation. However, it can have an attractively high Curie temperature above 570 • C. High Curie temperature piezoelectric sensors are desirable for imaging and other applications in certain industrial and research sectors. Presently, both phases have been synthesized as single phase samples as shown here from structural Rietveld analysis of their XRD. Characterization of both compounds by FTIR and XRD have been carried out and presented.

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Section: Experimental Outlinementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structural Characterization of Orthorhombic and Rhombohedral Lead Meta-Niobate Samples

Chakraborty

Sahu

et al. 2010

Integrated Ferroelectrics

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“…Slow ( ) cooling (from temperatures like 1270 ∘ C) leads [10,11] to PNS, rhombohedral PbNb 2 O 6 , which is not ferroelectric; ruling out piezoelectric properties and piezoelectric applications. So, most R & D efforts have been concentrated on orthorhombic PbNb 2 O 6 [1][2][3][4][5][12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Dielectric Properties of RhombohedralPbNb2O6

Sahu¹,

De²

2013

Journal of Solid State Physics

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Dielectric materials are needed in many electrical and electronic applications. So, basic characterizations need to be done for all dielectrics. PbNb 2 O 6 (PN) is ferroelectric and piezoelectric only in its orthorhombic phase, with potential high temperature applications. So, its rhombohedral phase, frequently formed as an undesirable impurity in the preparation of orthorhombic PN, has been ignored with respect to possible dielectric characterizations. Here, essentially single phase rhombohedral PN has been prepared, checking structure from XRD Rietveld Analysis, and the real and imaginary parts of permittivity measured in an Impedance Spectrometer (IS) up to ∼ 700 ∘ C and over 20 Hz to 5.5 MHz range, for heating and some cooling runs. Variations, with temperature, of relaxation time constant ( ), AC and DC conductivity, bulk resistance, activation energy and capacitance have been explored from our IS data.

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“…The activation energies calculated from dc conductivity measurement from different formalism showed the ionictype conduction in doped niobate Pb 0.74 K 0.13 Y 0.13 Nb 2 O 6 compound [15]. Thermal characterization through DSC technique for pure PbNb 2 O 6 showed the Curie temperature at 843 K in heating profile and at 826 K in cooling process [16].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Structural, Electrical, and Thermal Studies of ( and ) Ferroelectric Ceramics

Barbar

Roy

2012

ISRN Ceramics

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The polycrystalline ceramic samples of lead barium niobate with general formula Pb 1−x Ba x Nb 2 O 6 (x = 0.0 and 0.4) were prepared by conventional solid state reaction method. The room temperature X-ray diffraction patterns reveal that both of the samples have orthorhombic crystal structure with space group Cm2m. The dielectric constant and dissipation factor were measured as a function of frequency (100 Hz-2 MHz) and temperature (RT-660K). The DC electrical conductivity of both the samples was measured from RT to 660 K. The activation energies calculated from log σ versus 1000/T curves in ferroelectric phase of the compounds are 1.09 eV for pure (x = 0.0) sample and 1.36 eV for Ba-substituted (x = 0.4) sample. The values of activation energies show that the substitution of Ba 2+ ion on Pb 2+ ion site increases the resistivity of pure PbNb 2 O 6 (x = 0.0) ceramic. The modulated differential scanning calorimetry (MDSC) has been used to investigate the phase transition temperature of both the compounds and also to see the effect of Ba 2+ ion substitution on the phase transition temperature, specific heat, and other thermal parameters of the compound.

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Thermal characterization of piezoelectric and non-piezoelectric Lead Meta-Niobate

Cited by 17 publications

References 23 publications

Structural Characterization of Orthorhombic and Rhombohedral Lead Meta-Niobate Samples

Structural Characterization of Orthorhombic and Rhombohedral Lead Meta-Niobate Samples

Dielectric Properties of RhombohedralPbNb2O6

Synthesis, Structural, Electrical, and Thermal Studies of ( and ) Ferroelectric Ceramics

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