Structural and optical properties of Sr2NiWO6 double perovskite

Saadon, Nur Amira Farhana Mohamed; Ali, Nurliyana Mohd; Ibrahim, Norazila; Mohamed, Zakiah

doi:10.1063/5.0058023

Cited by 2 publications

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“…For example, double perovskites were introduced in the configuration of A 2 BB O 6 , where A or A consisted of alkaline earth or rare earth metals and B and B consisted of transition metals. With the rock-salt-like structure of BO 6 and B O 6 units in the crystal, various substitutions or doping can be performed in the B-site of the perovskite to elevate the compounds' properties such as magnetocaloric in Sm 2 NiMnO 6 [2], magnetodielectric in Eu 2 NiMnO 6 [3], and optical properties in Ba 2 ZnWO 6 or Sr 2 NiWO 6 [4][5][6]. The rise of the tellurium-based double perovskites with studies on structural and magnetic such as Sr 2 Co 1−x Mg x TeO 6 and Sr 2 MnTeO 6 [7,8] contributed to these materials fields in the last few years.…”

Section: Introductionmentioning

confidence: 99%

Dielectric, AC Conductivity, and DC Conductivity Behaviours of Sr2CaTeO6 Double Perovskite

Halizan

Mohamed

2022

Materials

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Relatively new double perovskite material, Sr2CaTeO6, has been prepared through conventional solid-state procedures. Structural, dielectric, and optical characteristics of this exquisite solid-state material were analysed in this study. The single-phase monoclinic P21/n structure of this prepared compound was well correlated with the literature review. Good distribution of grain sizes and shapes was observed in the morphological study of this compound. The discussions on its optical and dielectric properties are included in this manuscript. High dielectric real permittivity, low dielectric loss, and good capacitance over a range of temperatures possessed by this compound, as shown in dielectric and electrical modulus studies, indicated good potential values for capacitor applications. The Ro(RgQg)(RgbQgb) circuit fitted well with the impedance and electrical modulus plot of the compound. Its relatively high electrical DC conductivity in grain at high frequencies and its increasing value with the temperature are typical of a semiconductor behaviour. This behaviour might be attributed to the presence of minor oxygen vacancies within its lattice structure and provides a long-range conduction mechanism. A small difference between activation energy and Ea of DC conductivity indicates that the same charge carriers were involved in both grains and the grain boundaries’ long-range conduction. The electrical AC conductivity of this compound was found to contribute to the dielectric loss in grain structure and can be related to Jonscher’s power law. The presence of polarons in this compound was exhibited by non-overlapping small polaron tunnelling (NSPT) and overlapping large polaron tunnelling (OLPT) conduction mechanisms over a range of temperatures. Wide optical band gap and Eopt in the range of 2.6 eV to 3.6 eV were determined by using an indirect and direct allowed mechanism of electrons transitions. These values supported the efficient semiconducting behaviour of the grain in this material and are suitable for applications in the semiconductor industry.

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Section: Introductionmentioning

confidence: 99%

Dielectric, AC Conductivity, and DC Conductivity Behaviours of Sr2CaTeO6 Double Perovskite

Halizan

Mohamed

2022

Materials

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Structural, optical and dielectric properties of tellurium-based double perovskite Sr₂Ni_1−xZn_xTeO₆

et al. 2021

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Structural and optical properties of Sr2NiWO6 double perovskite

Cited by 2 publications

References 12 publications

Dielectric, AC Conductivity, and DC Conductivity Behaviours of Sr2CaTeO6 Double Perovskite

Dielectric, AC Conductivity, and DC Conductivity Behaviours of Sr2CaTeO6 Double Perovskite

Structural, optical and dielectric properties of tellurium-based double perovskite Sr₂Ni_1−xZn_xTeO₆

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Structural and optical properties of Sr2NiWO6 double perovskite

Cited by 2 publications

References 12 publications

Dielectric, AC Conductivity, and DC Conductivity Behaviours of Sr2CaTeO6 Double Perovskite

Dielectric, AC Conductivity, and DC Conductivity Behaviours of Sr2CaTeO6 Double Perovskite

Structural, optical and dielectric properties of tellurium-based double perovskite Sr2Ni1−xZnxTeO6

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Structural, optical and dielectric properties of tellurium-based double perovskite Sr₂Ni_1−xZn_xTeO₆