Synthesis, structural and dielectric properties of Ho-doped SrBi2Nb2O9 prepared by Co-precipitation method

Afqir, Mohamed; Tachafine, Amina; Fasquelle, Didier; Elaatmani, M.; Carru, Jean-Claude; Zegzouti, Abdelouahad; Daoud, Mohamed

doi:10.1007/s40843-016-5113-2

Cited by 18 publications

(8 citation statements)

References 20 publications

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“…The pure and Eu-doped SrBi 2 Nb 2 O 9 ceramic powders were prepared by co-precipitation method using the way very similar to those employed for Ho-doped SrBi 2 Nb 2 O 9 presented in our previous work [10] and proposed by Okubo and Kakihana [11]. The process is depicted in flowchart of Fig.…”

Section: Methodsmentioning

confidence: 99%

Structural, electric and dielectric properties of Eu-doped SrBi2Nb2O9 ceramics obtained by co-precipitation route

Afqir

Tachafine

Fasquelle

et al. 2018

PAC

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This paper presents a study of the structure and dielectric properties of Eu-doped SrBi2Nb2O9 ceramics prepared by co-precipitation route and sintered at 850?C. The materials were examined using XRD and FTIR methods. XRD data indicated the formation of well crystallized structure of the pure and doped SrBi2Nb2O9, without the presence of undesirable phases. FTIR spectra do not bring a significant shift in the band positions. Moreover, the AC conductivity, dielectric constant and dielectric loss of the ceramics were determined through the frequency range [50 kHz-1MHz]. In particular, the dielectric constant (??) and dielectric losses (tan ?) of the SrBi2Nb2O9 and SrBi1.6Eu0.4Nb2O9 ceramics were measured as a function of temperature at various frequencies.

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Section: Methodsmentioning

confidence: 99%

Structural, electric and dielectric properties of Eu-doped SrBi2Nb2O9 ceramics obtained by co-precipitation route

Afqir

Tachafine

Fasquelle

et al. 2018

PAC

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“…The outcome is found to be depended especially on precursors and how to choose the calcination temperature and time duration. The crystalline phase in the SrBi 2 Nb 2 O 9 samples tackes place at 1180, 800 and 500 °C when used solid state route, hydrothermal method and hybrid process (co-precipitation-hydrothermal) [5][6][7][8]. A small change was observed in the lattice parameter value, which indicates that the expansion is slightly greater in the unit cell for solid-state route than in the co-precipitation method.…”

Section: Introductionmentioning

confidence: 93%

Morphology control of SrBi2Nb2O9 prepared by a modified chemical method

et al. 2019

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SrBi 2 NbO 9 compounds were prepared through three methods: oxalate coprecipitation, molten salt synthesis and polymerizable complex. The effect of the molecular precursor route has also been investigated. For oxalate co-precipitation method, a solution obtained from acid oxalate, niobium oxide, bismuth nitrate and strontium nitrate are precipitated by ammoniac solution. Then, the precipitated sample is calcined at 1100 °C. A methanol-citric acid solution of solution of NbCl 5 , ethylene glycol, bismuth and strontium nitrates were used as precursors. A black powder ash was crystallized by heat-treating at 1100 °C. Molten salt technique using oxides and carbonate as starting materials and NaCl and KCl to form a reaction medium. The formation temperature was at 1110 °C. Multiple characterizations mainly X-ray diffraction, Fourier transformed infrared spectroscopy and scanning electron microscopy (SEM) measurements have provided to validate the structural feature. Careful, X-ray diffraction analysis showed the presence of two-layered Aurivillius structure. The crystallite size is discussed by Scherrer and Williamson-Hall approaches. SEM images of SrBi 2 NbO 9 ceramics showed plate-like, polygonal and structureless morphologies obtained at different synthesis conditions. Whatever the synthesis process, there is no change on the band of infrared spectra.

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“…Lanthanides doped SBN compound demonstrated rise in the dielectric loss due to annihilation of bismuth during sintering process. In view of this, it is desirable to dope SBN with rare earth ions [20][21][22]. Hence, an attempt is made to study the modi ed properties of SBN doping gadolinium at Bi-site of it.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Structural and Dielectric Studies on SrBi2-xGdxNb2O9 Lead Free Ceramics

Jaladi¹,

Rao

Workineh

et al. 2020

Preprint

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In this manuscript, the structural and dielectric properties of Gadolinium (Gd3+) substituted at Bi-site of SrBi2-xGdxNb2O9 (x= 0.0, 0.4, 0.6 and 0.8) prepared by using solid state reaction are studied. XRD analysis revealed the formation of single phase with orthorhombic structure in SBN and Gadolinium modified SBN. It is found that cell parameters and volume were decreased with increase of Gd3+ ion concentration in SBN. SEM analysis revealed that the samples possess well defined needle shaped grains. The grain size of SBN was hindered by the presence of Gd3+ ion at Bi-site. The growth of single phase layered perovskite structure was confirmed from FTIR and Raman spectroscopy. The dielectric properties of Gd3+ ion doped SBN ceramics are studied as a function of frequency (50Hz-1MHz) from room temperature to 500ºC. It is observed that phase transition temperature (Tc) decreased from 430ºC to 330ºC with increase of frequency due to incorporation of Gd3+ ion in SBN. The broadness of peaks and decrease in Tc indicate the transition from a normal ferroelectric to ferroelectric-relaxor type. The study on variation of tanδ with temperature at different frequencies indicates that tanδ has larger values at higher temperatures. Further, the diffuseness parameter (γ) has been computed for all the compositions.

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Synthesis, structural and dielectric properties of Ho-doped SrBi2Nb2O9 prepared by Co-precipitation method

Cited by 18 publications

References 20 publications

Structural, electric and dielectric properties of Eu-doped SrBi2Nb2O9 ceramics obtained by co-precipitation route

Structural, electric and dielectric properties of Eu-doped SrBi2Nb2O9 ceramics obtained by co-precipitation route

Morphology control of SrBi2Nb2O9 prepared by a modified chemical method

Synthesis, Structural and Dielectric Studies on SrBi2-xGdxNb2O9 Lead Free Ceramics

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