Dielectric characteristics of gel-grown mixed neodymium-lanthanum-heptamolybdate crystals

Brat, S.; Khosa, S. K.; Kotru, P. N.; Tandon, R. P.

doi:10.1007/bf00275377

Cited by 13 publications

(5 citation statements)

References 15 publications

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“…The value of dielectric constant decreases continuously with frequency for all the three compositions (x ¼ 0, 0.3 and 0.5) at all the measured temperatures. Similar behavior has been reported by other investigators [24][25][26][27] and can be explained on the basis of polarization mechanism. At low frequencies, all the mechanisms of polarization contribute to the dielectric constant and with the increase in frequency, the contributions from various types of polarizations starts decreasing.…”

Section: Raman Studysupporting

confidence: 91%

Effect of Mn doping on structural, morphological and dielectric properties of EuFeO₃ ceramics

Sultan

Ikram

2015

RSC Adv.

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Section: Raman Studysupporting

confidence: 91%

Effect of Mn doping on structural, morphological and dielectric properties of EuFeO₃ ceramics

Sultan

Ikram

2015

RSC Adv.

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“…Based on Figures 5-8 tion factor of the Tl 2 S crystalline medium exhibit similar dependences on temperature and frequency of the applied ac electric field. Similarity in behavior has been observed for many materials like lanthanum heptamolybdate [38], neodymium heptamolybdate [39] and La-Nd heptamolybdate [40]. The increase in trend in tan δ with temperature may be due to space charge polarization.…”

Section: Influences Of Frequency and Temperature On The Dissipation Fsupporting

confidence: 73%

“…So, the functional dependence of these DE parameters on temperature and frequency forms an important characteristic of these materials and is strongly required to be investigated. However, strong dependencies of these DE parameters on temperature and frequency of the applied ac field have been applicable for a large number of materials [22,[38][39][40]. Figure 12 depicts a plot of the quantity ln σ as a function of 1000 / T in the temperature range 77-300 K at selected working frequencies extending from 1 to 20.5 kHz.…”

Section: Influences Of Frequency and Temperature On The Ac-conductivitymentioning

confidence: 99%

Impacts of Temperature and Frequency on the Dielectric Properties for Insight into the Nature of the Charge Transports in the Tl2S Layered Single Crystals

Badr¹

2011

JMP

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Investigation of the electric properties of semi-conducting materials in an applied ac electric fields gives information about the nature of charge transport and localized states in the forbidden gap. Layered crystals usually contain structural defects, such as dislocations and vacancies that may form a high density of localized states near the Fermi level. So, the current study was carried out for insight into the dielectric Properties of Tl 2 S layered single crystals. These properties were studied using the ac measurements in the low temperatures ranging from 77 to 300 K. The real part of dielectric constant ε ‫׳‬ , imaginary part of dielectric constant ε ‫״‬ , the dissipation factor tan δ and the alternating current conductivity σ ac were measured in an applied ac electric field of frequencies extending from 2.5 to 50 kHz. Based on the dependencies of these dielectric parameters on both the frequency and temperature, the dielectric properties of the crystals under investigation were elucidated and analyzed. The ac conductivity was found to obey the power law σ ac (ω) = Aω s with which the values of the exponent s were evaluated to be less than unity in the range 0.21 ≥ s ≥ 0.19. Furthermore, it was found that the temperature dependence of ac conductivity follows the Arrhenius relation via which the impact of temperature on the electrical processes in an applied ac electric field was illustrated and analyzed. The influences of temperature and frequency on both the exponent s and band gap were also discussed in this investigation.

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“…However, at temperature 240 • C it reduces with frequency sharply. This type of behaviour of dielectric materials is very common and has been observed in many materials [10,[24][25][26][27][28][29][30][31]. It is well known fact that the polarization arises from induced electrical dipoles with in the material.…”

Section: Dependence Of Dielectric Constant Dielectric Loss and Condumentioning

confidence: 95%

“…This behaviour is almost similar to the behaviour of dielectric constant with frequency at different temperatures. Many investigators have reported this type of behaviour [10,[24][25][26][27][28][29][30]. Lossy dielectric can be represented by the circuit analog of a resistance in parallel with a capacitor [34].…”

Section: Dependence Of Dielectric Constant Dielectric Loss and Condumentioning

confidence: 99%

Dielectric and Ferroelectric Studies on Gel Grown Samarium Tartrate (SmT) Crystals

et al. 2007

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Samarium tartrate (SmT) single crystals have been grown by gel encapsulation technique. The crystallinity of the grown crystals was confirmed by XRD technique. The dielectric constant, dielectric loss and ac conductivity was measured as a function of frequency in the range 5 kHz to 1 MHz and temperature range 20 • C to 275 • C. Dielectric studies show a transition peak at temperature 240 • C. This transition peak is further supported by thermal and IR studies. The nature of the transition can be explained by the relation (1/ε − 1/ε max ) = A (T − T c ) γ and is reported to be diffused. The variation of ac conductivity with temperature and frequency has been reported and is represented by the relation σ ac = Aω s . The saturation polarization (P s ), remanent polarization (P r ) and coercive field (E c ) of the polarization -electric field hysteresis are reported for the material. The material (SmT) is proposed to be ferroelectric.

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Dielectric characteristics of gel-grown mixed neodymium-lanthanum-heptamolybdate crystals

Cited by 13 publications

References 15 publications

Effect of Mn doping on structural, morphological and dielectric properties of EuFeO₃ ceramics

Effect of Mn doping on structural, morphological and dielectric properties of EuFeO₃ ceramics

Impacts of Temperature and Frequency on the Dielectric Properties for Insight into the Nature of the Charge Transports in the Tl2S Layered Single Crystals

Dielectric and Ferroelectric Studies on Gel Grown Samarium Tartrate (SmT) Crystals

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Dielectric characteristics of gel-grown mixed neodymium-lanthanum-heptamolybdate crystals

Cited by 13 publications

References 15 publications

Effect of Mn doping on structural, morphological and dielectric properties of EuFeO3 ceramics

Effect of Mn doping on structural, morphological and dielectric properties of EuFeO3 ceramics

Impacts of Temperature and Frequency on the Dielectric Properties for Insight into the Nature of the Charge Transports in the Tl2S Layered Single Crystals

Dielectric and Ferroelectric Studies on Gel Grown Samarium Tartrate (SmT) Crystals

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Effect of Mn doping on structural, morphological and dielectric properties of EuFeO₃ ceramics

Effect of Mn doping on structural, morphological and dielectric properties of EuFeO₃ ceramics