Effect of Gd amphoteric substitution on structure and dielectric properties of BaTiO3-based ceramics

Li, Lingxia; Wang, Mingjing; Guo, Dong; Fu, Ruixue; Meng, Qinglei

doi:10.1007/s10832-012-9773-9

Cited by 34 publications

(19 citation statements)

References 21 publications

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“…The diameter of each grain is measured at different points and the average value is taken to ensure the accuracy of the measured grain size. The graph shows a decrement trend of grain size from 158.74 nm to 62.87 nm as the Gd 3+ doping concentration increased, which is in agreement with Li's results [7]. The grain size decrement can be attributed to inhibition behaviour of the grains due to Gd 3+ ions substitution at Ba 2+ in perovskite lattice.…”

Section: Resultssupporting

confidence: 89%

“…Few studies have investigated the effect of incorporation of Gd 3+ dopant in barium titanate. Li et al [7] have reported that Gd 3+ ions substitution in Ba or Ti site within perovskite lattice depends on doping concentration, which affects directly on the dielectric constant of the final composite. Dale found that Gd 3+ dopant has the greatest increment in the dielectric constant for barium titanate compared to other rare-earth dopant in his study [8].…”

Section: Introductionmentioning

confidence: 99%

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Sol-Gel Synthesis and Characterization of Ba1-xGdxTiO3+δ Thin Films on SiO2/Si Substrates Using Spin-Coating Technique

Teh

Saif²,

Poopalan³

2017

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Ba1-xGdxTiO3+δ, at x = 0, 0.05, 0.1, 0.15, 0.2, (BGT) thin films have been fabricated on SiO2/Si substrate using sol-gel method. The microstructure and surface morphology of the fabricated films have been investigated using X-ray diffraction (XRD) and atomic force microscopy (AFM). The XRD results show that the fabricated films are crystalline with perovskite structure. There is a shifting of the preferred peak at 31.5° to a higher angle as the doping ratio increases suggesting a distortion lattice exists in the films, which could be due to the substitution of Gd 3+ ions into Ba-site. The decreasing of lattice constants confirms the substitution of Gd 3+ in BaTiO3 lattice structure. The microstrain and dislocation density are found to be increased with the increase of Gd 3+ doping, which attributed to the reduction of lattice volume that due to the ionic size mismatch effect. The AFM results show decreasing trend in both average grain size and roughness parameters. Therefore, the microstructure and surface morphology of BGT samples is strongly dependent on the Gd 3+ doping concentration that mainly due to the difference ionic radius substitution.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Sol-Gel Synthesis and Characterization of Ba1-xGdxTiO3+δ Thin Films on SiO2/Si Substrates Using Spin-Coating Technique

Teh

Saif²,

Poopalan³

2017

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“…From earlier reports, it was suggested that if Cr cations are substituted in Ti (0.061 nm) site of SrTiO 3 , the maximum intensity plane (110) has to be shifted towards lower angle [10]. Li et al [29] reported amphoteric substitution of Gd 3? in BaTiO 3 based ceramics and explained that the possibility of A or B site doping was depends on their ionic radius and dopant concentration.…”

Section: Resultsmentioning

confidence: 99%

Carrier mediated ferromagnetism in Cr doped SrTiO3 compounds

Muralidharan

Anbarasu

Perumal

et al. 2015

J Mater Sci: Mater Electron

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The carrier doped ferromagnetism in SrTiO 3 compounds has been investigated for the importance in the field of multiferroics and spintronics. Polycrystalline pure and Cr doped SrTiO 3 compounds were synthesized by glycol assisted sol-gel method. Powder X-ray diffraction (XRD) studies reveal the simple cubic perovskite structure of all the prepared compounds. The grain size and lattice strain of the compounds were estimated from the powder XRD pattern which evidences the incorporation of Cr in SrTiO 3 system. The local order and disorder parameter of the compounds was investigated by laser Raman spectroscopy. The change in particles to rod like surface morphology while increasing Cr doping concentration was examined by scanning electron microscope and transmission electron microscopy. The enhancement of oxygen vacancy while increasing Cr doping concentration in SrTiO 3 system and reduction in Ti 4? to Ti 3? states was identified by X-ray photoelectron spectroscopy. The UVVis absorption spectra evidence the distinctive shift of absorption edge exclusively for Cr doped SrTiO 3 compounds. Photoluminescence (PL) spectra of the compounds reveal defective states and decrease in PL intensity due to the influence of Cr in SrTiO 3 . Electron paramagnetic resonance analysis of Cr doped compounds reveals the paramagnetic nature of the dopants. The magnetization studies of all the prepared compounds emphasis carrier mediated diamagnetic to ferromagnetic phase transition in due with the presence of carriers induced by Cr. It is also evident that the highest dopant concentration of Cr in SrTiO 3 system exhibits reversal ferromagnetism. The enhancement of magnetization and ferromagnetic ordering has been understood in terms of carrier-mediated Ruderman-KittelKasuya-Yosida interaction theory. The present work also demonstrates the influence of surface morphology on the occurrence of ferromagnetism in Cr doped SrTiO 3 compounds.

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“…Ferroelectric barium titanate (BaTiO 3 , BT) possesses a typical perovskite structure ABO 3 , which is used in many electronic devices, including high-permittivity multilayer ceramic capacitors (MLCC's). 1 The interest in BT stems from the high relative permittivity 10,000-12,000, observed at the ferro-to para-electric phase-transition temperature (about 130 o C), also known as the Curie temperature T c . 2 Above T c , in the paraelectric state, the temperature dependence of the dielectric constant follows the Curie-Weiss law and around T c , a sharp Curie peak can always be found.…”

Section: Introductionmentioning

confidence: 99%

The diffuse phase transition of Ti-rich (Ba0.75Sr0.25) Ti1+dO3+2d dielectric ceramics

Zhang¹,

Zhong²,

Chen³

et al. 2020

Mater. Tehnol.

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The microstructures, dielectric properties and phase-transition behavior of Ti-rich barium-strontium-titanate-based ceramics synthesized by the solid-state method were investigated with a non-stoichiometric level by SEM, XRD and an LCR measuring system. It was found that all the (Ba0.75Sr0.25)Ti1+dO3+2d ceramics (d = 0.005, 0.01, 0.015, 0.02) are single-phase solid solutions with a typical tetragonal perovskite structure. With an increasing d value, the average grain size of the (Ba0.75Sr0.25)Ti1+dO3+2d ceramics increases. The strengthened spontaneous polarization resulting from the unit-cell deformation is responsible for the increase of the transition temperature Tm as d increases. Also, the dielectric parameters erRT and em increase with an increasing non-stoichiometric level. The low-temperature (T £ Tm) frequency dispersion of the relative dielectric constant can be found and the diffuse phase-transition behavior is suppressed with an increasing d value in the (Ba0.75Sr0.25)Ti1+dO3+2d ceramics.Avtorji so analizirali mikrostrukture, dielektri~ne lastnosti in fazne prehode barij-stroncij titanatne kermamike bogate s Ti, ki so jo sintetizirali z metodo sintranja v trdni fazi. Analize na nestehiometri~nem nivoju so izvajali s pomo~jo SEM, XRD in LCR preiskovalnih sistemov. Ugotovili so da vsebuje (Ba0.75Sr0.25)Ti1+dO3+2d keramika (pri d = 0,005, 0,01, 0,015 ali 0,02) enofazno trdno raztopino s tipi~no tetragonalno peroviskitno strukturo. Z nara{~ajo~o vrednostjo d nara{~a povpre~na velikost kristalnih zrn (Ba0.75Sr0.25)Ti1+dO3+2d keramike. Oja~ana spontana polarizacija je posledica deformacije enovite celice, kar povzro~i z nara{~ajo~im d tudi nara{~anje temperature prehoda Tm. Prav tako s pove~evanjem nestehiometrije nara{~ata dielektri~na parametra erRT in em. Ugotovili so tudi, da ima z nara{~ajo~o vrednostjo d (Ba0.75Sr0.25)Ti1+dO3+2d keramika nizko disperzijo temperaturne frekvence (T = Tm) relativne dielektri~ne konstante in zatrt prehod difuzivne faze. Klju~ne

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Effect of Gd amphoteric substitution on structure and dielectric properties of BaTiO3-based ceramics

Cited by 34 publications

References 21 publications

Sol-Gel Synthesis and Characterization of Ba1-xGdxTiO3+δ Thin Films on SiO2/Si Substrates Using Spin-Coating Technique

Sol-Gel Synthesis and Characterization of Ba1-xGdxTiO3+δ Thin Films on SiO2/Si Substrates Using Spin-Coating Technique

Carrier mediated ferromagnetism in Cr doped SrTiO3 compounds

The diffuse phase transition of Ti-rich (Ba0.75Sr0.25) Ti1+dO3+2d dielectric ceramics

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