Electrical Properties of Na1 - xKxNbO3(0.28 ≤ x ≤ 0.40)

Kandari, Alok Singh; Bhandari, Aradhana; Bourai, A. A.; Panwar, N. S.

doi:10.1080/00150190902961900

Cited by 19 publications

(5 citation statements)

References 26 publications

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“…0). 23) The higher value of " r near T c is also supported by the Curie weiss relation. The temperature dependence of dielectric loss (tan ) is shown in Fig.…”

Section: Resultsmentioning

confidence: 73%

Role of Sintering Temperature on the Phase Stability and Electrical Properties of 0.94(K_0.5Na_0.5NbO₃)–0.06(LiSbO₃) Ceramics

Palei¹,

Kumar²

2012

Jpn. J. Appl. Phys.

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Lead-free 0.94(K0.5Na0.5NbO3)–0.06(LiSbO3) (KNN–LS) ceramics were prepared by conventional solid-state reaction route (CSSR). For single perovskite phase formation the calcination was done at 850 °C for 6 h. Whereas for obtaining dense morphology the sintering of KNN–LS ceramics was carried out at 1060, 1080, 1100, and 1120 °C temperatures for 4 h, respectively. The structural study revealed that with the increase in sintering temperature the structure of the ceramic transformed from pure tetragonal to pseudocubic phase. Scanning electron microscopy (SEM) micrographs indicated that the optimum sintering temperature of the ceramic was found to be 1080 °C. The Curie temperature (T c) of the KNN–LS ceramic was found to decrease at higher sintering temperature. The development of typical hysteresis loop confirmed the ferroelectric and piezoelectric nature of the KNN–LS ceramics sintered at different temperatures. The KNN–LS ceramics sintered at 1080 °C showed better ferroelectric and piezoelectric properties i.e., remnant polarization (P r)∼17.2 µC/cm2, coercive field (E c)∼13.5 kV/cm, piezoelectric coefficient (d 33)∼161 pC/N, coupling coefficient (k p)∼0.36 and remnant strain ∼0.06% were obtained.

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“…0). 23) The higher value of " r near T c is also supported by the Curie weiss relation. The temperature dependence of dielectric loss (tan ) is shown in Fig.…”

Section: Resultsmentioning

confidence: 73%

Role of Sintering Temperature on the Phase Stability and Electrical Properties of 0.94(K_0.5Na_0.5NbO₃)–0.06(LiSbO₃) Ceramics

Palei¹,

Kumar²

2012

Jpn. J. Appl. Phys.

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“…Dielectric polarization in a material is the sum total of the different polarization mechanisms; such as electronic, ionic, dipolar and interfacial polarization. [11][12][13][14] At lower frequency all the polarizations respond easily to the time varying electric field but as the frequency of the field increases different polarizations are filtered out, as a result the over all polarizations of the material decreases which leads to the decrease in the value of ε r . 14 It can also be observed from Fig.3 that with increasing frequency tanδ value increases, which is due to the increase in ionic conductivity.…”

Section: Methodsmentioning

confidence: 96%

“…The sharp rise of ε r value near T C is due to softens of soft mode frequency. 14 Fig.5 shows the polarization versus electric field behavior of KNN ceramic for K 0.33 Na 0.67 NbO 3 system at RT. The development of well saturated P-E hysteresis loop confirms the ferroelectric nature of the K 0.33 Na 0.67 NbO 3 sample under study.…”

Section: Methodsmentioning

confidence: 98%

“…The phase transition in perovskite materials generally occurs due to instability of temperature dependent low frequency optical soft mode. 14,[16][17][18][19][20] At T c , frequency of the soft mode tends to zero and the lattice displacement associated with it becomes unstable and leads to phase transition. The sharp rise of ε r value near T C is due to softens of soft mode frequency.…”

Section: Methodsmentioning

confidence: 99%

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Synthesis And Characterization Of Lead Free K[sub 0.33]Na[sub 0.67](NbO[sub 3]) MPB System

Pattanaik¹,

Kumar²

2010

AIP Conference Proceedings

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Lead-free K 0.33 Na 0.67 (NbO 3 ), a morphotropic phase boundary (MPB) composition of Potasium Sodium Niobate (KNN) system has been synthesized in single perovskite phase by partial co-precipitation method. X-ray studies revealed monoclinic structure at room temperature. SEM characterization of the sintered ceramics revealed dense and homogeneous packing of grains. Room temperature (RT) dielectric constant (ε r ) and dielectric loss (tanδ) at 1 KHz were found to be ~388 and 0.03 respectively , whereas a relatively high density ρ ∼ 4.45g/cm 3 , remnant polarization (P r ) ∼ 4.95 µc/cm 2 , coercive field (E c ) ∼5.60kV/cm, Curie temperature (T c ) ∼370 o C have been observed.

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“…So-called ''morphotropic phase boundaries'' have been reported at x$ 0.5, 0.35 and 0.2. Further structural investigations have discounted any significant structural change at the x¼0.35 composition, although inconsistent reports of discrepancies in properties around this composition exist [2,3].…”

Section: Introductionmentioning

confidence: 99%

Ferroelectric and octahedral tilt twin disorder and the lead-free piezoelectric, sodium potassium niobate system

Schiemer

Withers

Liu

et al. 2012

Journal of Solid State Chemistry

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Using electron diffraction, trends in the local structural behaviour of the K x Na 1 À x NbO 3 (KNN x) 'solid solution' system are investigated and interpreted using an order/disorder based theoretical framework. At room temperature, electron diffraction shows a single plane of transverse polarised, diffuse intensity perpendicular to [0 1 0] p * (p for parent sub-structure) across the entire phase diagram, indicative of ferroelectric disorder along the [0 1 0] p direction co-existing with long range ferroelectric order along the orthogonal [1 0 0] p and [0 0 1] p directions. An additional characteristic pattern of diffuse scattering is also observed, involving rods of diffuse intensity running along the [1 0 0] p * and [0 0 1] p * directions of the perovskite sub-structure and indicative of octahedral tilt disorder about the [1 0 0] p and [0 0 1] p axes co-existing with long range ordered octahedral tilting around the [0 1 0] p direction. A possible crystal chemical explanation for the existence of this latter octahedral tilt disorder is explored through bond valence sum calculations. The possible influence of both types of disorder on the previously refined, room temperature space group/s and average crystal structure/s is examined.

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Electrical Properties of Na_{1 - x}K_xNbO₃(0.28 ≤ x ≤ 0.40)

Cited by 19 publications

References 26 publications

Role of Sintering Temperature on the Phase Stability and Electrical Properties of 0.94(K_0.5Na_0.5NbO₃)–0.06(LiSbO₃) Ceramics

Role of Sintering Temperature on the Phase Stability and Electrical Properties of 0.94(K_0.5Na_0.5NbO₃)–0.06(LiSbO₃) Ceramics

Synthesis And Characterization Of Lead Free K[sub 0.33]Na[sub 0.67](NbO[sub 3]) MPB System

Ferroelectric and octahedral tilt twin disorder and the lead-free piezoelectric, sodium potassium niobate system

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Electrical Properties of Na1 - xKxNbO3(0.28 ≤ x ≤ 0.40)

Cited by 19 publications

References 26 publications

Role of Sintering Temperature on the Phase Stability and Electrical Properties of 0.94(K0.5Na0.5NbO3)–0.06(LiSbO3) Ceramics

Role of Sintering Temperature on the Phase Stability and Electrical Properties of 0.94(K0.5Na0.5NbO3)–0.06(LiSbO3) Ceramics

Synthesis And Characterization Of Lead Free K[sub 0.33]Na[sub 0.67](NbO[sub 3]) MPB System

Ferroelectric and octahedral tilt twin disorder and the lead-free piezoelectric, sodium potassium niobate system

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Product

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Electrical Properties of Na_{1 - x}K_xNbO₃(0.28 ≤ x ≤ 0.40)

Role of Sintering Temperature on the Phase Stability and Electrical Properties of 0.94(K_0.5Na_0.5NbO₃)–0.06(LiSbO₃) Ceramics

Role of Sintering Temperature on the Phase Stability and Electrical Properties of 0.94(K_0.5Na_0.5NbO₃)–0.06(LiSbO₃) Ceramics