The relaxation processes of dielectric, modulus and impedance in Dy0.55Sr0.45Mn1- xFexO3

Yadagiri, K.; Nithya, R.

doi:10.1016/j.jpcs.2021.110232

Cited by 6 publications

(5 citation statements)

References 34 publications

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“…With the increase in in temperature, we find that the distance between Z max ″ and M max ″ peaks is reducing (Figure b–d), which indicates the temperature-activated delocalized relaxation in this crystal. Therefore, we conclude that increasing the temperature leads to delocalized polarons (toward Debye-type) relaxation in the Cs 2 AgBiBr 6 crystal. , …”

Section: Resultsmentioning

confidence: 67%

Dielectric Relaxation and Polaron Hopping in Cs₂AgBiBr₆ Halide Double Perovskites

et al. 2022

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The lead-free Cs2AgBiBr6 double perovskites have recently emerged as promising candidates for optoelectronic applications due to their less toxicity and high stability. Although the photophysical study of Cs2AgBiBr6 has been extensively explored, the same for dielectric relaxation and carrier conduction remains elusive. Here, we uncover the dielectric relaxation and charge conduction mechanism in the Cs2AgBiBr6 single crystals using temperature-dependent electrochemical impedance spectroscopy in correlation with modulus spectroscopy. We found that the ionic displacement and space charge polarization are mainly responsible for the dielectric response. A sharp transition frequency as ∼191 Hz for 0 °C to ∼492 Hz for 90 °C was observed in the dielectric constant (ε′) versus temperature study, where dε′/dT exhibits a positive and negative coefficient below and above the transition frequency, respectively. Stevels model analysis suggests that the contribution of traps reduces with the increase in temperature and therefore conduction enhances. This model also confirms the polarons as the main conduction carriers in the Cs2AgBiBr6 semiconductor. The polaron hopping and binding energy were estimated as W H = 0.17 eV and E P = 0.34 eV, respectively. The binding energy of the polaron is larger than the room-temperature thermal energy, indicating the polaron hopping instead of free charge carrier transport as the dominant conduction mechanism. Furthermore, the imaginary part of -Z″ and M″ demonstrates the temperature-activated polaron relaxation from non-Debye type to Debye type process in Cs2AgBiBr6 crystals. Our study provides fundamental insights into the dielectric relaxation behavior needed for developing efficient dielectric switches and unveils the details of the carrier conduction mechanism in lead-free double perovskites.

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Section: Resultsmentioning

confidence: 67%

Dielectric Relaxation and Polaron Hopping in Cs₂AgBiBr₆ Halide Double Perovskites

et al. 2022

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“…To gain insight into the electrical processes responsible for dielectric relaxations at different frequencies and temperatures occurring at the microscopic level [46], an analysis of the electric modulus is carried out. The frequency-dependent real (M ′ ) part of the modulus spectra from 300 K to 550 K is presented in figure 7(a).…”

Section: Resultsmentioning

confidence: 99%

Optical and dielectric properties of divalent copper based double perovskite compound, Gd₂CuTiO₆

Saha,

Nithya,

Sarguna

et al. 2024

J. Phys.: Condens. Matter

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In this work, we have investigated high temperature dielectric properties and room temperature optical properties on rare earth ion based orthorhombic Gd2CuTiO6. Optical properties like reflectance and band gap were determined from UV-visible diffuse reflectance spectroscopy technique and photoluminescence spectrum. The compound exhibited substantial optical absorption and emission in the visible region. Our findings reveal the presence of an intermediate band, as evidenced by the difference between the band gap values obtained from the Tauc plot using the diffuse reflectance spectrum (3.07 eV) and the photoluminescence spectrum (2.4 eV). Furthermore, thermogravimetric analysis demonstrated high thermal stability with <0.4% change in mass over a wide temperature range of 30-1200°C in air environment. Moreover, lead-halide free compound, GCTO is highly thermally stable oxide double perovskite with wide band gap and absorption in the UV-Vis range are highly suitable for optical applications In addition, dielectric properties of the compound have been examined using impedance spectroscopy as a function of frequency ranging from 500 Hz to 1 MHz and temperature between 300 K and 550 K. Compounds with relaxor behaviour at high temperatures and high thermal stability are desired for several applications. Because of the cation disorders present in this compound, Gd2CuTiO6 displays dielectric relaxor behaviour indicative of a distribution of relaxation times. Furthermore, the frequency-dependent modulus illustrated a thermally activated conduction mechanism. Cole-Cole plots of electrical modulus suggest prominent grain contribution above 350 K.

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“…Consequently, we deduce that the temperature increase results in the delocalized polarons relaxation (to Debye-type) within Cs 2 AgSbCl 6 . 56,57…”

Section: Resultsmentioning

confidence: 99%

“…Consequently, we deduce that the temperature increase results in the delocalized polarons relaxation (to Debye-type) within Cs 2 AgSbCl 6 . 56,57 Furthermore, to substantiate the conduction mechanism and delineate the attributes of polarons, transient absorption spectroscopy was conducted through excitation at a 350 nm wavelength. The resultant spectral prole is displayed in Fig.…”

Section: Resultsmentioning

confidence: 99%

Interpretation of dielectric behavior and polaron hopping in lead-free antimony-based double perovskite

Ben Bechir,

Alresheedi

2023

RSC Adv.

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The relaxation processes of dielectric, modulus and impedance in Dy0.55Sr0.45Mn1- xFexO3

Cited by 6 publications

References 34 publications

Dielectric Relaxation and Polaron Hopping in Cs₂AgBiBr₆ Halide Double Perovskites

Dielectric Relaxation and Polaron Hopping in Cs₂AgBiBr₆ Halide Double Perovskites

Optical and dielectric properties of divalent copper based double perovskite compound, Gd₂CuTiO₆

Interpretation of dielectric behavior and polaron hopping in lead-free antimony-based double perovskite

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The relaxation processes of dielectric, modulus and impedance in Dy0.55Sr0.45Mn1- xFexO3

Cited by 6 publications

References 34 publications

Dielectric Relaxation and Polaron Hopping in Cs2AgBiBr6 Halide Double Perovskites

Dielectric Relaxation and Polaron Hopping in Cs2AgBiBr6 Halide Double Perovskites

Optical and dielectric properties of divalent copper based double perovskite compound, Gd2CuTiO6

Interpretation of dielectric behavior and polaron hopping in lead-free antimony-based double perovskite

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Product

Resources

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Dielectric Relaxation and Polaron Hopping in Cs₂AgBiBr₆ Halide Double Perovskites

Dielectric Relaxation and Polaron Hopping in Cs₂AgBiBr₆ Halide Double Perovskites

Optical and dielectric properties of divalent copper based double perovskite compound, Gd₂CuTiO₆