Dielectric behavior of the PbNb2O6 ferroelectric ceramic in the frequency range of 20Hz to 2GHz

Guerrero, F.; Leyet, Y.; Venet, Michel; Guerra, José de los Santos; Eiras, J. A.

doi:10.1016/j.jeurceramsoc.2007.02.091

Cited by 15 publications

(10 citation statements)

References 8 publications

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“…This way, all of the nearly forty grains examined have been found to be in orthorhombic phase. Figures 2-4 show versus frequency, versus frequency, and tan = / versus frequency results (over 20 Hz to 5.5 MHz range) for 12 temperatures from 50 ∘ C to 700 ∘ C. In Figure 2, real part ( ) of dielectric constant decreases with increase of measuring frequency up to about ln = 12 to 14 region, implying ∼162 kHz to ∼1203 kHz region, and then increases sharply with increase of frequency as reported earlier [13] for all temperatures except at low temperatures like 200 ∘ C. Moreover, is low and less dependent on frequency at low temperatures up to 300 ∘ C, leading to overlap of several graphs. It increases with increase of temperature, up to 573 ∘ C. Graph of shows significantly increased values in the 573 ∘ C graphs with respect to The inset is an enlarged view of the variation of in the higher frequency range.…”

Section: Resultssupporting

confidence: 61%

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Dielectric Properties of PbNb₂O₆ up to 700°C from Impedance Spectroscopy

Sahu¹,

De²

2013

Journal of Materials

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Piezoelectric materials have wide band gap and no inversion symmetry. Only the orthorhombic phase of lead metaniobate (PbNb2O6) can be ferroelectric and piezoelectric below Curie temperature, but not the rhombohedral phase. High temperature piezoelectric applications in current decades have revived international interest in orthorhombic PbNb2O6, synthesis of which in pure form is difficult and not well documented. Second problem is that its impedance spectroscopy (IS) data analysis is still incomplete. Present work attempts to fill up these two gaps. Presently found synthesis parameters yield purely orthorhombic PbNb2O6, as checked by X-ray Rietveld analysis and TEM. Present 20 Hz to 5.5 MHz IS from room temperature to 700°C shows its ferroelectric Curie temperature to be one of the highest reported, >574°C for 0.5 kHz and >580°C for 5.5 MHz. Dielectric characteristics and electrical properties (like capacitance, resistance and relaxation time of the equivalent CR circuit, AC and DC conductivities, and related activation energies), as derived here from a complete analysis of the IS data, are more extensive than what has yet been reported in the literature. All the properties show sharp changes across the Curie temperature. The temperature dependence of activation energies corresponding to AC and DC conductivities has been reexamined.

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Section: Resultssupporting

confidence: 61%

“…So, higher materials are being developed worldwide for high temperature (HT) applications. Lead metaniobate (PbNb 2 O 6 ), shortened here as PNO, with a higher Curie temperature (517 to 570 ∘ C in different papers), is one of the present candidate materials [2][3][4][5][6][7][8][9][10][11][12][13][14]. It was discovered [3] in 1953.…”

Section: Introductionmentioning

confidence: 99%

Dielectric Properties of PbNb₂O₆ up to 700°C from Impedance Spectroscopy

Sahu¹,

De²

2013

Journal of Materials

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“…The temperature dependence of capacitance shows a sharp maximum at the temperature at which the ferroelectric-paraelectric transition occurs, the position of the maximum does not depend on frequency, which is typical for ferroelectric materials [19,20].…”

Section: Discussionmentioning

confidence: 99%

Crystallization and ferroelectric properties of Ge4Sb1Te5 films

Santos¹,

Prokhorov²,

Beltrán³

et al. 2010

Journal of Non-Crystalline Solids

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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]. Even the real part ( ) and imaginary part ( ) of the dielectric constant of the nonferroelectric PbNb 2 O 6 with rhombohedral phase have rarely been reported [16,22].…”

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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Dielectric behavior of the PbNb2O6 ferroelectric ceramic in the frequency range of 20Hz to 2GHz

Cited by 15 publications

References 8 publications

Dielectric Properties of PbNb₂O₆ up to 700°C from Impedance Spectroscopy

Dielectric Properties of PbNb₂O₆ up to 700°C from Impedance Spectroscopy

Crystallization and ferroelectric properties of Ge4Sb1Te5 films

Dielectric Properties of RhombohedralPbNb2O6

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Dielectric behavior of the PbNb2O6 ferroelectric ceramic in the frequency range of 20Hz to 2GHz

Cited by 15 publications

References 8 publications

Dielectric Properties of PbNb2O6 up to 700°C from Impedance Spectroscopy

Dielectric Properties of PbNb2O6 up to 700°C from Impedance Spectroscopy

Crystallization and ferroelectric properties of Ge4Sb1Te5 films

Dielectric Properties of RhombohedralPbNb2O6

Contact Info

Product

Resources

About

Dielectric Properties of PbNb₂O₆ up to 700°C from Impedance Spectroscopy

Dielectric Properties of PbNb₂O₆ up to 700°C from Impedance Spectroscopy