Structural and dielectric properties of ZrO 2 –TiO 2 –V 2 O 5 nanocomposite prepared by CO-precipitation calcination method

Padmamalini, N.; Ambujam, K.

doi:10.1016/j.mssp.2015.09.009

Cited by 10 publications

(3 citation statements)

References 30 publications

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“…The enhancement of the εr could be related to the Zr substitution at the Ti la ice site [54]. This increase may also be a ributed to the complex process of grain growth and densification of the ceramic [55,56]. Another crucial factor contributing to the enhancement of εr is the ionic polarizability.…”

Section: Resultsmentioning

confidence: 99%

Origin of Temperature Coefficient of Resonance Frequency in Rutile Ti1−xZrxO2 Microwave Ceramics

Khan,

Muhammad

et al. 2024

Ceramics

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In this study, we report the effect of Zr4+ doping on the optical energy gap and microwave dielectric properties of rutile TiO2. Rietveld analysis explicitly confirmed that Zr4+ occupies the octahedral site, forming a single-phase tetragonal structure below the solubility limit (x < 0.10). Notably, at x = 0.025, a significant enhancement in Q × fo was observed. This enhancement was attributed to the reduction in dielectric loss, associated with a decrease in oxygen vacancies and a lower concentration of Ti3+ paramagnetic centers. This conclusion was supported by Raman and electron paramagnetic resonance spectroscopy, respectively. The origin of high τf in rutile Ti1−xZrxO2 is explained on the basis of the octahedral distortion/tetragonality ratio, covalency, and bond strength.

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Section: Resultsmentioning

confidence: 99%

Origin of Temperature Coefficient of Resonance Frequency in Rutile Ti1−xZrxO2 Microwave Ceramics

Khan,

Muhammad

et al. 2024

Ceramics

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“…The chemical and physical properties displayed by these crystallographic forms depend on the synthesis route [55]. Titanium dioxide nanoparticles can be produced by approaches such as the sol-gel technique [55,56], microwave assisted hydrolysis [57], hydrothermal method [58], co-precipitation route [59], flame combustion method [60,61] and chemical vapour deposition (CVD) [62].…”

Section: Titanium Dioxide (Tio 2 )mentioning

confidence: 99%

Platinum-Based Carbon Nanodots Nanocatalysts for Direct Alcohol Fuel Cells

Gwebu¹,

Nomngongo²,

Maxakato³

2019

Nanocatalysts

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Platinum and its alloys are regarded as best nanocatalysts for the electro-oxidation of alcohol fuels especially in acidic conditions. The performance of nanocatalysts for alcohol fuel cells depends greatly on the support material. A good support material should have high surface area to obtain high metal dispersion. It should also bond and interact with the nanocatalysts to improve the activity of the overall electrode. Most importantly, the support material should offer great resistance to corrosion under the harsh fuel cell conditions. In this chapter, the use of carbon nanodots as support materials for Pt-Sn and Pt-TiO 2 nanoparticles is discussed. The electrochemical activity of Pt/CNDs, Pt-Sn/CNDs and Pt/CNDs-TiO 2 nanocatalysts was studied using cyclic voltammetry (CV) in acidic and alkaline conditions. Chronoamperometry (CA) was used to investigate the long-term stability of the nanocatalysts under the fuel cell environment. Electrochemical results demonstrated that binary Pt nanocatalysts are more active compared to monocatalysts. It was also observed that carbon nanodots are better support materials than carbon black. Blending carbon nanodots with titanium dioxide (a ceramic material) improves the corrosion resistance of the nanocatalyst. Cyclic voltammetry results also proved that alcohol electro-oxidation is enhanced in alkaline conditions.

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“…[17][18][19][20] Zirconium oxide (ZrO 2 ) has been extensively investigated in its tetragonal and cubic phases, particularly for their dielectric properties. [21][22][23] However, the orthorhombic phase, especially in the form of nanorods, remains relatively unexplored. To bridge this gap, we employ a co-precipitation method to synthesize orthorhombic ZrO 2 nanorods.…”

mentioning

confidence: 99%

Synthesis and Characterization of High Dielectric Constant Zirconia Nano-Rods for Advanced Sensors and Energy Storage Applications

Godlaveeti,

Tighezza,

et al. 2024

ECS J. Solid State Sci. Technol.

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This study reports the synthesis of high dielectric constant zirconia oxide (ZrO2) nanorods (NRs) via a co-precipitation method followed by calcination at 700°C for 2 hours. X-ray diffraction (XRD) confirms a mixed-phase composition of orthorhombic and monoclinic structures, while transmission electron microscopy (TEM) reveals distinct nanorods. Energy dispersive X-ray analysis (EDAX) verifies the elemental composition. Photoluminescence (PL) spectroscopy indicates band gap energy of 1.9 eV, aligning better with orthorhombic zirconia. UV-Vis analysis suggests oxygen vacancy defects potentially influencing the optical properties due to the nanorod morphology. Importantly, dielectric studies show a high dielectric constant of 29 at 1 MHz, which is approximately four times higher than commercially available ZrO2.

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Structural and dielectric properties of ZrO 2 –TiO 2 –V 2 O 5 nanocomposite prepared by CO-precipitation calcination method

Cited by 10 publications

References 30 publications

Origin of Temperature Coefficient of Resonance Frequency in Rutile Ti1−xZrxO2 Microwave Ceramics

Origin of Temperature Coefficient of Resonance Frequency in Rutile Ti1−xZrxO2 Microwave Ceramics

Platinum-Based Carbon Nanodots Nanocatalysts for Direct Alcohol Fuel Cells

Synthesis and Characterization of High Dielectric Constant Zirconia Nano-Rods for Advanced Sensors and Energy Storage Applications

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