Studies on structural, dielectric and optical properties of Cu/W double substituted calcium manganite for solar cells and thermistor applications

Parida, S. K.

doi:10.1080/01411594.2021.1995606

Cited by 39 publications

(4 citation statements)

References 69 publications

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“…Because the barrier potential of the compound reduces as temperature rises, the resistance of the compound also decreases, which improves the conductivity mechanism in the sample. [ 35,36 ] The fact that the real component of impedance decreases as temperature increases supports the presence of negative temperature coefficient resistance (NTCR) in the synthesised material. [ 37 ] Real impedance can also vary when flaws with thermally activated space charges are present.…”

Section: Resultsmentioning

confidence: 99%

Dielectric and Electrical Behavior of Apraseodymium Based Tungsten Bronze Ceramics

Devi,

Behera,

Moharana

et al. 2024

Macromolecular Symposia

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The ceramic oxide Na2Ba2Pr2W2Ti4Nb4O30 (NBPWTN) is prepared by a mechanical mixed oxide route. The compound formation and the phase are concluded from the x‐ray diffraction pattern taken at room temperature (XRD). The uniform distribution of grains of various sizes with negligible voids is studied from scanning electron micrograph of the sample pellet. The presence of dielectric dispersion and ferroelectric phase in the material is observed from the temperature‐dependent dielectric parameters at selected frequencies. The existence of ferroelectricity in the material is further confirmed by the room temperature hysteresis loop. Impedance spectroscopic studies informed about the correlation between the microstructure and electrical behavior. The frequency variation of AC conductivity refers to Jonscher's law. The temperature variation of frequency exponent term n indicates OLPT (overlapping large polaron‐tunneling) model of the conduction mechanism in the sample. NBPWTN is a strong candidate for applications involving thermistor‐related devices because of the temperature dependency of resistance. The value of temperature sensitivity coefficient β in our investigation is achieved between 2000 and 11 000 K, confirming that the material has a high‐temperature stability property and is ideal for high‐temperature electronics applications. The high room temperature dielectric constant value of the ceramic (around 500) is useful for dielectric capacitor applications.

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Section: Resultsmentioning

confidence: 99%

Dielectric and Electrical Behavior of Apraseodymium Based Tungsten Bronze Ceramics

Devi,

Behera,

Moharana

et al. 2024

Macromolecular Symposia

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“…Since resistance decreases with increasing temperature, which confirms the semiconducting nature of the studied materials. [ 52–54 ]…”

Section: Resultsmentioning

confidence: 99%

“…Since resistance decreases with increasing temperature, which confirms the semiconducting nature of the studied materials. [52][53][54] Similarly, Figure 7b shows the variation Cole-Cole plot of the SrCu 1/3 Mn 1/3 W 1/3 O 3 ceramic at some selected temperatures. The nature of the curves is semi-circular, which confirms that our sample has semiconducting properties.…”

Section: Nyquist and Cole-cole Plotsmentioning

confidence: 99%

A Comprehensive Study of Cu/W Double Substitution in Strontium Manganate Ceramics for Some Device Applications

Parida

2024

Cryst. Res. Technol.

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In this communication, the synthesis and characterizations of modified strontium manganate (SrCu1/3Mn1/3W1/3O3) (SCMWO) by high‐temperature solid‐state method are reported. The structural analysis predicts a monoclinic structure with a crystallite size of 36.8 nm. The analysis of the Raman active modes reveals the presence of all the constituent atomic vibrations. The study of the ultraviolet–visible spectrum provides a bandgap energy of 1.71 eV, which may be suitable for photovoltaic applications. A Maxwell‐Wanger type of polarization effect is observed at low frequency while low dielectric loss makes the material suitable for energy storage devices. The study of the impedance plots reveals the negative temperature coefficient of resistance (NTCR) character. The activation energy increases with both frequency and temperature in the modified perovskite suggesting that conductivity of the sample increases and material characters are changing from dielectric to semiconducting. The symmetrical curves in the electrical modulus plots and shift toward higher frequency region agree with the results of the non‐Debye‐type of relaxation mechanism. The semicircular curves in the Cole–Cole plots confirm the semiconducting nature and are also well supported by the results of Nyquist plots. The studied material exhibits a semiconductor nature, which may be found suitable for energy storage device applications.

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“…The decrease in the value of electric permittivity is attributed to an increase in recurrence, which leads to a depletion in available space and a reduction in dipolar charge polarization. [17][18].…”

Section: Study Of Dielectric Characteristicsmentioning

confidence: 99%

Synthesis and characterization of Modified Bismuth ferrite (1-x)BiFeO 3 - x(BiK)Ti/MnO 3 , (x=0.15, 0.20)

Sourav,

Choudhary,

Prasad

2024

Preprint

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In present era main aim of the researchers is to develop lead free material for ferroelectric material device. Ceramics of perovskite compounds were successfully synthesized using a chemical decomposition method, with the composition (1-x) BiFeO3-x(Bi K)TiMnO3, where x was varied at 0.15 and 0.20. The confirmation of compound creation was based on the analysis of Crystelloplotic XRD pattern data. The BKTM 15% exhibits an average grain size of 0.41 µm, while BKTM 20% shows 0.40 µm. Energy-dispersive X-ray analysis detected elements such as Bi, Fe, Na, K, Ti, and Mn. Modulus property exploration revealed non-Debye model relaxation behavior, observed particularly for sensor technology applications. To investigate the relaxation and conduction mechanisms in these samples were conducted at different temperatures and recurrence. Additionally, the scanning electron microscope (SEM) was employed to examine particle allocation and the location of grain boundaries. Impedance spectroscopic studies covered a wide temperature range (300-780K) and a broad recurrence range (103-106 Hz). Complex plane and Impedance scale are semicircular arcs, which related to semiconducting character of the sample.

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Studies on structural, dielectric and optical properties of Cu/W double substituted calcium manganite for solar cells and thermistor applications

Cited by 39 publications

References 69 publications

Dielectric and Electrical Behavior of Apraseodymium Based Tungsten Bronze Ceramics

Dielectric and Electrical Behavior of Apraseodymium Based Tungsten Bronze Ceramics

A Comprehensive Study of Cu/W Double Substitution in Strontium Manganate Ceramics for Some Device Applications

Synthesis and characterization of Modified Bismuth ferrite (1-x)BiFeO 3 - x(BiK)Ti/MnO 3 , (x=0.15, 0.20)

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