Dielectric and piezoelectric properties of rare-earth gadolinium modified lead lanthanum zirconium niobium titanate ceramics

Ramam, Koduri; Chandramouli, K.

doi:10.1016/j.ceramint.2010.11.016

Cited by 13 publications

(5 citation statements)

References 21 publications

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“…Reducing the radii of cations in the BO 6 octahedra of the perovskite structure ABO 3 , could increase the Goldschmidt's tolerance factor, therefore, improving the crystalline structure stability. The Goldschmidit tolerance factor (t) for perovskite can be calculated as following equation (1) using the radii of ions: 17,18 …”

Section: Resultsmentioning

confidence: 99%

Structure and magnetic properties of the perovskite YCo0.5Fe0.5O3

et al. 2014

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Y Co0.5Fe0.5O3, in a structure of perovskite, has been successfully prepared with citrate precursors at 950-1100 °C in air by the sol-gel method. The X-ray diffraction patterns show that the samples are orthorhombic within the space group Pnma, where the Co and Fe ions are disordered at the 4b crystallographic sites. The crystal structure refinement undertaken by the Rietveld method has shown that the distortion of Co(Fe)O6 octahedra are large, where the ratio of Co/Fe-O bonding length along a axis to that in the bc plane is about 1.07. Such a large crystal lattice distortion implies a strong lattice-magnetism coupling, which may be utilized in the magnetoelectric devices. Magnetic measurement indicates that the Y Co0.5Fe0.5O3 is antiferromagnetic but showing weak ferromagnetism. We find that Fe3+ ions are in high-spin states, while Co3+ ions are in low-spin states which do not contribute to the magnetism. Both Fe3+ and Co3+ ions are not Jahn-Teller activated although the lattice distortion is large.

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Section: Resultsmentioning

confidence: 99%

Structure and magnetic properties of the perovskite YCo0.5Fe0.5O3

et al. 2014

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“…Strontium (Sr) is a chemically highly reactive alkaline Earth metal that exhibits chemical similarity with calcium and can be utilized to enhance the properties of Cr 2 O 3 . The utilization of Sr in various applications has been extensively investigated, revealing its potential for beneficial effects through doping with metal oxides (Akihide et al, 2004;Li et al, 2007;Ramam and Chandramouli, 2009;Suresh and Roy, 2012;Kiani et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Strontium-doped chromium oxide for RhB reduction and antibacterial activity with evidence of molecular docking analysis

et al. 2023

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The emergence of multi-drug resistance (MDR) in aquatic pathogens and the presence of cationic dyes are the leading causes of water contamination on a global scale. In this context, nanotechnology holds immense promise for utilizing various nanomaterials with catalytic and antibacterial properties. This study aimed to evaluate the catalytic and bactericidal potential of undoped and Sr-doped Cr2O3 nanostructures (NSs) synthesized through the co-precipitation method. In addition, the morphological, optical, and structural properties of the resultant NSs were also examined. The optical bandgap energy of Cr2O3 has been substantially reduced by Sr doping, as confirmed through extracted values from absorption spectra recorded by UV-Vis studies. The field-emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) micrographs illustrate that the composition of Cr2O3 primarily consisted of agglomerated, irregularly shaped NSs with a morphology resembling nanoflakes. Moreover, the presence of Sr in the lattice of Cr2O3 increased the roughness of the resulting NSs. The catalytic activity of synthesized NSs was analyzed by their reduction ability of Rhodamine B (RhB) dye in the dark under different pH conditions. Their antibacterial activity was evaluated against MDR Escherichia coli (E. coli). Sr doping increased antibacterial efficiency against MDR E. coli, as indicated by inhibition zone measurements of 10.15 and 11.75 mm at low and high doses, respectively. Furthermore, a molecular docking analysis was conducted to determine the binding interaction pattern between NSs and active sites in the target cell protein. The findings corroborated antimicrobial test results indicating that Sr-Cr2O3 is the most effective inhibitor of FabH and DHFR enzymes.

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“…The strongest dielectric response is that associated with the doped sample of 1mol %Cr. The dielectric losses reach minimum values, for PLNZNT ceramic doped with; 0.0, 0.5 and 1 molar % of Cr, comparing with PLNZNT ceramic doped with 2.5 and 5 molar % of Cr [15]. Above the phase transition temperature, the dielectric losses of the PLNZNCT ceramic increase strongly and constantly throughout the series.…”

Section: Dielectric Characterizationmentioning

confidence: 85%

Structural and Dielectric Study of a PLNZNT Ceramic Material Doped with Chromium

Hadjadj¹,

Boutarfaïa²,

Zenkhri³

2019

ACSM

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The purpose of this work is to show the effect of Chromium (Cr) on the microstructural and dielectric properties of solid solution: [Pb(0.975) La0, 015Nd0.01][(Zr0, 524Ti0, 476) (0.9875-(w/4))Nb0.005 CrwO3] with w = 0.0, 0.5, 1.0, 2.5 and 5.0 molar % (abbreviated PLNZNCT) were developed by solid state chemical reaction. The analysis by X-ray diffraction and the calculation of the tolerance factor (t) show a stable single-phase perovskite structure of tetragonal symmetry sintered at 1200°C. The SEM micrograph, the density test and the dielectric measurements indicate that the PLNZNCT ceramic achieves optimal values at 1 mol% Cr3 +. These obtained results, perhaps characterize the classic hard ferroelectric materials.

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Dielectric and piezoelectric properties of rare-earth gadolinium modified lead lanthanum zirconium niobium titanate ceramics

Cited by 13 publications

References 21 publications

Structure and magnetic properties of the perovskite YCo0.5Fe0.5O3

Structure and magnetic properties of the perovskite YCo0.5Fe0.5O3

Strontium-doped chromium oxide for RhB reduction and antibacterial activity with evidence of molecular docking analysis

Structural and Dielectric Study of a PLNZNT Ceramic Material Doped with Chromium

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