Electrical, electromechanical and structural studies of lead potassium samarium niobate ceramics

Rao, K. Sambasiva; Krishna, P. Murali; Dasari, Madhavaprasad; Lee, Joon‐Hyung; Kim, Jin-Soo

doi:10.1016/j.jallcom.2007.10.023

Cited by 74 publications

(23 citation statements)

References 46 publications

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“…Figure 10 shows the evolution of e 00 as a function of frequency at different temperatures. This figure shows that the imaginary part of permittivity has a low-frequency dispersive behavior when temperature increases [31]. There are no appreciable relaxation peaks in the frequency range employed in this study.…”

Section: Dielectric Propertiesmentioning

confidence: 54%

Synthesis, crystal structure, thermal and dielectric properties of tetrapropylammonium tetrabromozincate [N(C3H7)4]2[ZnBr4] compound

2016

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The new organic-inorganic compound tetrapropylammonium tetrabromozincate [N(C 3 H 7 ) 4 ] 2 ZnBr 4 has been synthesized and characterized by single-crystal X-ray diffraction, differential scanning calorimetry, IR, Raman and impedance measurements. The crystal structure refinement shows that the [N(C 3 H 7 ) 4 ] 2 ZnBr 4 compound is crystallized in the monoclinic system (space group C 2/c ) with the following unit cell parameters: a = 33.145(5) Å , b = 14.234(3) Å , c = 15.081(2) Å , b = 110.207(5)°and Z = 8. The structural arrangement of the title compound can be described as an alternation of organic and inorganic layers along the [100] direction. Differential scanning calorimetry disclosed two order-disorder transition phases located at 340 and 393 K. Besides, an analysis of the dielectric constants e 0 and e 00 , at several frequencies, shows a distribution of relaxation times. This relaxation is probably due to the reorientational dynamics of alkyl chains.

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Section: Dielectric Propertiesmentioning

confidence: 54%

Synthesis, crystal structure, thermal and dielectric properties of tetrapropylammonium tetrabromozincate [N(C3H7)4]2[ZnBr4] compound

2016

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“…At very high frequencies (f [ 1/s), dipoles can no longer follow the field [9]. The high values of dielectric constant at low frequencies can be explained as the accumulation of charges at the grain boundaries and at the interfaces between the sample and the electrode, i.e., space charge polarization [10]. It was observed from Fig On the other hand, the maximum value of imaginary dielectric constant is at 300 and 200°C.…”

Section: Resultsmentioning

confidence: 97%

Effect of Tb, Ti co-doping on the electrical and magnetic properties of (Bi, La)FeO3 multiferroic ceramics

Sharma

Shandilya

Rai

2015

J Mater Sci: Mater Electron

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Polycrystalline samples of Bi 0.6 Tb 0.1 La 0.3 Fe 0.7 Ti 0.3 O 3 hereby designated as (BTbLFT) was prepared by using a solid state reaction technique and their structural, magnetic, and electric property were investigated. X-ray diffraction analysis indicated that all the samples maintained original R3c space group. The XRD patterns of the samples at room temperature showed perovskite phase with hexagonal structure at room temperature. The plots of Z 00 and M 00 versus frequency at various temperatures show peaks in the higher temperature range (250-390°C). The compounds show dielectric relaxation, which is found to be of nonDebye type and the relaxation frequency shifted to higher side with increase in temperature. The Nyquist plot and conductivity studies showed the NTCR character of samples. M-H hysteresis loop of BTbLFT samples at an applied field of 1 T exhibited spontaneous magnetization of 1.735 emu/g. By using VSM technique, a significant change in the magnetic properties was observed for this ceramic and highest magnetic moment were found at temperature 5 K.

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“…As the frequency increases (f < 1/τ), dipoles begin to lag behind the field and when the frequency reaches the characteristic frequency (f = 1/τ), the dielectric constant falls steeply [11][12]. At low frequencies, the dispersion of real and imaginary parts of dielectric constant is due to space charge polarization which is observed for all the temperatures [13]. The log (ε″) vs. log (f) plot at different temperatures is shown in the inset of Fig.3.…”

Section: Dielectric Studymentioning

confidence: 93%

Dielectric Relaxation, Ionic Conduction and Complex Impedance Studies on NaNo3 Fast Ion Conductor

Kumar¹

2013

IJMSA

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AC conductivity, dielectric constant, loss and electric modulus of Sodium nitrate system have been studied in the frequency range from 1Hz to 10MHz and in the temperature range from 303 K to 563 K by employing impedance spectroscopy. The frequency dependent ac conductivity follows Jonscher's universal power law. Dimensionless frequency exponent (n), dispersion parameter (A) are determined. The change over frequency independent conductivity to frequency dependent conductivity at all temperatures shows the relaxation mechanism. The variation of real part of dielectric constant with frequency shows strong dispersion at low frequencies and saturation at high frequencies. The presence of peaks in the frequency plots of dielectric loss, imaginary parts of impedance and modulus are attributed to the relaxation processes. It is also confirmed by the temperature dependence study of real part of dielectric constant. The activation energy from relaxation processes and conductivity has been evaluated.

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Electrical, electromechanical and structural studies of lead potassium samarium niobate ceramics

Cited by 74 publications

References 46 publications

Synthesis, crystal structure, thermal and dielectric properties of tetrapropylammonium tetrabromozincate [N(C3H7)4]2[ZnBr4] compound

Synthesis, crystal structure, thermal and dielectric properties of tetrapropylammonium tetrabromozincate [N(C3H7)4]2[ZnBr4] compound

Effect of Tb, Ti co-doping on the electrical and magnetic properties of (Bi, La)FeO3 multiferroic ceramics

Dielectric Relaxation, Ionic Conduction and Complex Impedance Studies on NaNo3 Fast Ion Conductor

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