Sol-gel synthesized and microwave heated Pb0.8-yLayCo0.2TiO3 (y = 0.2–0.8) nanoparticles: Structural, morphological and dielectric properties

Kumar, N. Suresh; Suvarna, R. Padma; Naidu, K. Chandra Babu

doi:10.1016/j.ceramint.2018.07.027

Cited by 60 publications

(46 citation statements)

References 28 publications

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“…Herein, the morphology showed the presence of some fiber type of elongated nanoparticles within the vicinity of nanospheres. Similar kinds of observations were identified in the literature reported by Kumar et al [1,11]. From the observations of present work and the literature [1,11], it was concluded that the presence of ferroelectric cations such as Pb & Ba and La like rare earth cations can induce the morphology of samples.…”

Section: Surface Morphologysupporting

confidence: 91%

“…That means, the ionic radii of cations present in BCLT material were listed according to Shannon reports [27] like this: Ba +2 :1.35 Å, Cu +2 : 0.73 Å, & La +3 : 1.032 Å, and Ti +3 : 0.670 Å. From these reports, it was confirmed that the Lacations of larger ionic radii will have the probability to replace the Ti-cations of smaller ionic radii [1]. Thus, there may be a possibility for the enhancement of unit cell dimensions which in turn leads to the increase of lattice constants as a function of La-content.…”

Section: Introductionmentioning

confidence: 86%

“…It is a known fact that most of the ceramic titanate materials contain the cubic perovskite structure with a general chemical formula ABO 3, where 'A' atom is located at the corner position, 'B' atom occupies the body centre position and the oxygen atom prefers at the face centre position of the cubic unit cell [1][2][3][4][5][6][7][8][9][10]. In general, the barium titanate (BT) is a promising dielectric material exhibiting very attractive and tremendous applications caused due to the low particle size [11].…”

Section: Introductionmentioning

confidence: 99%

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Optical and functional properties of hydrothermally synthesized tetragonal Ba_0.4Cu_0.6−xLa_xTiO₃ (x = 0.2–0.6) nanoparticles

Prakash

Kumar

Naidu

2020

Mater. Res. Express

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Ba 0.4 Cu 0.6−x La x TiO 3 (x=0.2, 0.4 & 0.6) (BCLT) nanoparticles were prepared by hydrothermal method. The x-ray diffraction (XRD) pattern established the existence of tetragonal phases. The nanospheres were observed in the surface morphology of present materials using the transmission electron microscopy (TEM). The optical properties were investigated to confirm the presence of metal oxide bonds as well as the optical band-gap energy of BCLT nanoparticles. The dielectric and impedance parameters were studied as a function of frequency and composition. The Cole-Cole plots were drawn to understand the microstructure and electrical conduction mechanism. In addition, the ferroelectric nature was carried out with the help of polarization versus electric field (P-E) loop tracer. Materials and methodsBa 0.4 Cu 0.6−x La x TiO 3 (x=0.2, 0.4, & 0.6) nanoparticles were synthesized via hydrothermal technique. The flow chart for the preparation of BCLT samples was depicted in figure 1. The starting raw materials of Ba (NO 3 ) 2 .6H 2 O

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Section: Surface Morphologysupporting

confidence: 91%

Section: Introductionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

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Optical and functional properties of hydrothermally synthesized tetragonal Ba_0.4Cu_0.6−xLa_xTiO₃ (x = 0.2–0.6) nanoparticles

Prakash

Kumar

Naidu

2020

Mater. Res. Express

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“…The diffraction pattern attributed the formation of single-phase cubic spinel structure indicating the existence of pure phases. 25,26 The results revealed that the "D" value was noted to be decreasing from 29 to 22 nm with increase of Zn-content in the CF system. The maximum intense reflection plane was noted to be (311).…”

Section: Resultsmentioning

confidence: 93%

“…Further, the average crystallite diameter (D) was calculated using the Scherrer formula: D = kλ/βCosθ, where β is the FWHM, λ is the wave length of Cu Kα source (0.15406 nm), and θ is the diffraction angle. 25,26 The results revealed that the "D" value was noted to be decreasing from 29 to 22 nm with increase of Zn-content in the CF system. This may be obtained owing to the increase of microstrain during the calcination reaction.…”

Section: Methodsmentioning

confidence: 93%

Magnetic and antimicrobial properties of cobalt‐zinc ferrite nanoparticles synthesized by citrate‐gel method

Vinuthna

Naidu

et al. 2019

Int J Applied Ceramic Tech

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The cobalt‐zinc ferrite (CZF) nanomaterials were prepared by citrate‐gel method, and further calcined at 600°C. The single‐phase cubic spinel structure of CZF was confirmed using the X‐ray diffraction pattern. The average crystallite size was found to be in the range of 22‐29 nm. The surface morphology was examined using the scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The average particle size of Co0.6Zn0.4Fe2O4 was determined to be 19 nm using TEM study which is supporting the average crystallite size measured from the X‐ray diffraction studies. The Fourier‐transform infrared spectra revealed the two strong absorption bands in the series of ferrites between 4500 and 500 cm−1 and these are responsible for the characteristic of spinel ferrites. The presence of elements Cu, Zn, and Co of CZF was confirmed by the elemental spectral signals of energy dispersive spectroscopy. At room temperature, the magnetic measurements of pure ZnFe2O4 and Co0.6Zn0.4Fe2O4 were evaluated based on hysteresis curves (M‐H curves). The results expressed that the addition of nonmagnetic Zn2+ ions increases the magnetic behavior in the mixed CZF samples. The antimicrobial activity of the ZnFe2O4 and Co0.6Zn0.4Fe2O4 nanoferrites was tested against harmful microbes.

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Photocatalytic Activity, Negative AC‐Electrical Conductivity, Dielectric Modulus, and Impedance Properties in 0.6 (Al_0.2La_0.8TiO₃) + 0.4 (BiFeO₃) Nanocomposite

Mallikarjuna

Ramesh

Kumar

et al. 2020

Crystal Research and Technology

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A series of nanocomposites with a chemical formula of (1−x) (Al0.2La0.8TiO3) + x (BiFeO3)/ALTBF is prepared through low temperature hydrothermal method. The tetragonal phases are detected at x = 0.2 and the x = 0.4–0.8 composites show the existence of cubic phases. The transmission electron microscope pictures show the presence of well‐defined spherical particles for all composites. Furthermore, photocatalytic activity is observed for x = 0.2–0.8 composites during time intervals ranging from 0 to 240 min. The x = 0.2, 0.6, and 0.8 nanocomposites reveal the usual behavior of ac‐electrical conductivity (σac), dielectric modulus parameters (M′ and M″), and impedance parameters (Z′ and Z″). However, interestingly, x = 0.4 composite performs the negative values of electrical parameters like σac, M′, M″, and Z″. This implies that x = 0.4 composite behaves like a metamaterial possessing negative indexed electrical parameters. Therefore, x = 0.4 composite can be well suited for microwave device applications at high frequency.

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Sol-gel synthesized and microwave heated Pb0.8-yLayCo0.2TiO3 (y = 0.2–0.8) nanoparticles: Structural, morphological and dielectric properties

Cited by 60 publications

References 28 publications

Optical and functional properties of hydrothermally synthesized tetragonal Ba_0.4Cu_0.6−xLa_xTiO₃ (x = 0.2–0.6) nanoparticles

Optical and functional properties of hydrothermally synthesized tetragonal Ba_0.4Cu_0.6−xLa_xTiO₃ (x = 0.2–0.6) nanoparticles

Magnetic and antimicrobial properties of cobalt‐zinc ferrite nanoparticles synthesized by citrate‐gel method

Photocatalytic Activity, Negative AC‐Electrical Conductivity, Dielectric Modulus, and Impedance Properties in 0.6 (Al_0.2La_0.8TiO₃) + 0.4 (BiFeO₃) Nanocomposite

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Sol-gel synthesized and microwave heated Pb0.8-yLayCo0.2TiO3 (y = 0.2–0.8) nanoparticles: Structural, morphological and dielectric properties

Cited by 60 publications

References 28 publications

Optical and functional properties of hydrothermally synthesized tetragonal Ba0.4Cu0.6−xLaxTiO3 (x = 0.2–0.6) nanoparticles

Optical and functional properties of hydrothermally synthesized tetragonal Ba0.4Cu0.6−xLaxTiO3 (x = 0.2–0.6) nanoparticles

Magnetic and antimicrobial properties of cobalt‐zinc ferrite nanoparticles synthesized by citrate‐gel method

Photocatalytic Activity, Negative AC‐Electrical Conductivity, Dielectric Modulus, and Impedance Properties in 0.6 (Al0.2La0.8TiO3) + 0.4 (BiFeO3) Nanocomposite

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Sol-gel synthesized and microwave heated Pb0.8-yLayCo0.2TiO3 (y = 0.2–0.8) nanoparticles: Structural, morphological and dielectric properties

Optical and functional properties of hydrothermally synthesized tetragonal Ba_0.4Cu_0.6−xLa_xTiO₃ (x = 0.2–0.6) nanoparticles

Optical and functional properties of hydrothermally synthesized tetragonal Ba_0.4Cu_0.6−xLa_xTiO₃ (x = 0.2–0.6) nanoparticles

Photocatalytic Activity, Negative AC‐Electrical Conductivity, Dielectric Modulus, and Impedance Properties in 0.6 (Al_0.2La_0.8TiO₃) + 0.4 (BiFeO₃) Nanocomposite