Mono and co-substitution of Sr2+ and Ca2+ on the structural, electrical and optical properties of barium titanate ceramics

Zaman, Tasmia; Islam, Khairul; Rahman, Abdur; Hussain, A.; Matin, Abdul; Rahman, Shamimur

doi:10.1016/j.ceramint.2019.02.064

Cited by 39 publications

(25 citation statements)

References 52 publications

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“…Distortion in structure and thus a reduction in Fe-O-Fe bond angle due to lower sized Mo 6+ doping is evidenced in our structural refinement data and this probably account for the red shift in this case. In addition, there might also be an influence of oxygen vacancy and crystallite size on the optical band gap energy as reported earlier [25]. Due to the narrower bandgap, BBFMO ceramics might be useful for degradation of pollutants or photocatalytic hydrogen generation from water splitting under visible light [37].…”

Section: Optical Propertymentioning

confidence: 79%

“…The increasing trend of dielectric constant can be unraveled by the grain size effect on dielectric properties. For larger grains, domain wall movement is much easier and this leads to an improved dielectric property [25]. SEM images in figure 3 lucidly show that partial substitution of Mo 6+ for Fe 3+ has an impact on increasing grain size.…”

Section: Dielectric Propertymentioning

confidence: 95%

“…High amount of porosity as shown in table 2 might have a contribution for high loss. Other parameters like domain density, internal stress etc need to be considered for the further clarification of this loss tangent (tanδ) behavior [25].…”

Section: Magnetic Propertymentioning

confidence: 99%

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Influence of Ba and Mo co-doping on the structural, electrical, magnetic and optical properties of BiFeO₃ ceramics

Sen

Hasan

Islam

et al. 2020

Mater. Res. Express

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In this work, -Bi Ba Fe Mo O x x 0.8 0.2 13 (x = 0, 0.5, 0.10 and 0.15) ceramics were synthesized by conventional solid-state reaction to evaluate the influence of Ba 2+ and Mo 6+ co-doping on the structure, morphology, electrical, magnetic and optical properties of BiFeO 3 ceramic. Rietveld refinement of x-ray diffraction data was done to obtain the subtle structural information. A tetragonal structure of P4mm type was revealed for Bi Ba FeO 0.8 0.2 3 (x = 0) ceramic. Evolution of rhombohedral (R3c) phase was observed with Mo 6+ doping and a complete transformation to R3c phase from P4mm was found for 15 wt% Mo 6+ doping. This type of transformation causes distortion in the structure and results in changing bond angle. Magnetization was found to be improved with increasing the percentage of Mo 6+ up to 10 wt%. Canting of spin due to the change in Fe-O-Fe bond angle is believed to be the main reason behind this improvement. One secondary phase BaMoO 4 was found and becomes prominent with Mo 6+ doping. Possible formation of this impurity and its correlation with properties are explained. Microstructural analysis was done to observe the Ba 2+ and Mo 6+ co-doping effect on grain size and distribution. A correlation of grain size with electric and magnetic properties is drawn and elucidated. Dielectric constant shows an increasing trend with Mo 6+ doping. Reduction in oxygen vacancy, due to charge compensation upon high charged Mo 6+ addition, believed to be the staple reason behind the dielectric constant increment. Lastly, optical band gap energy found to be decreased with the addition of Mo 6+ and possible reasons behind this are evaluated. Overall, codoping of Ba 2+ and Mo 6+ found to have a positive influence over materials electrical, optical as well as magnetic property.

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Section: Optical Propertymentioning

confidence: 79%

Section: Dielectric Propertymentioning

confidence: 95%

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Influence of Ba and Mo co-doping on the structural, electrical, magnetic and optical properties of BiFeO₃ ceramics

Sen

Hasan

Islam

et al. 2020

Mater. Res. Express

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“…Based on previous studies, low-temperature sintering PNN-PMW-PZT ceramics have T c of about 300°C and excellent piezoelectric properties, which are expected to be applied in A survey of the published literature modeling of CMCs has been studied by a n ers. Processes that have been modeled CVD, 17,18 CVI, [19][20][21][22] and Sol-Gel Infiltrat of alumina matrix in eight-harness satin has been studied numerically in Ref. [ proaches used in the above work general ing the flow of a high viscosity resin thr and modeling the chemical reactions and during processing.…”

Section: Introductionmentioning

confidence: 99%

Phase, domain, and microstructures in Sr²⁺ substituted low‐temperature sintering PZT‐based relaxor ferroelectrics

Chen

Xing

et al. 2021

J Am Ceram Soc.

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The Ag-Pd internal electrode of multilayer piezoelectric ceramics needs to be sintered below 1000°C, and lead wires and components need to be welded with leadfree solder at 260°C. PNN-PMW-PZT-xSr piezoelectric ceramics with high Curie temperature (T c > 260°C) were synthesized at a low sintering temperature (960°C) to meet the requirements of multilayer piezoelectric devices. The relationship between structures (phase, domain, and microstructures) and electrical properties (piezo/ferroelectric properties, and dielectric relaxation) in the Sr 2+ substituted ceramics was investigated. Rietveld refinement and Raman spectra show that Sr 2+ substitution can cause the phase change and increase the force constant of [BO 6 ] octahedron. The piezoelectric response increases with increasing the content of the tetragonal phase (CTP) in the rhombohedral-tetragonal (R-T) coexisted ceramics. The ceramics with 0.6 mol% Sr 2+ substitution have minimum activation energy for domain wall movement (E a ) of 0.0362 eV which favors the formation of nanometer-sized domains, and possess excellent electrical properties (d 33 = 623 pC/N, d 33 * =783 pm/V, T c =295°C).The higher the CTP, the lower the E a . The lower E a favors the rotation of polarization direction and extension, and is beneficial to the generation of the nanometer-size domains, resulting in high piezoelectric properties.

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“…Barium titanate is one of the few ceramics known to exhibit excellent ferroelectric properties. It was one of the most important ferroelectric oxides used in the electronic industry before the invention of PZT [21][22][23][24]. The d33 coe cients and ferroelectric properties of doped barium titanate are comparable to those of PZT.…”

Section: Introductionmentioning

confidence: 99%

Structural, Morphological and Thermal Decomposition Studies of Calcium and Hafnium Modified BaTiO3 Electro Ceramics

Fernández¹,

Bindhu²,

Prabu³

et al. 2021

Preprint

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Calcium and hafnium co-doped barium titanate could be used as a replacement for lead zirconate titanate, which is a lead-based ferroelectric material. Solid state reaction accompanied by the usual sintering technique is the classical ceramic-processing method, which demands a lot of time and effort. The present work aims to make the process a lot easier and quicker by employing a modified sol-gel combustion technique to synthesize polycrystalline Ba0.85Ca0.15Ti(1-x)HfxO3 (x=0.00, 0.05, 0.10, 0.15) electro ceramics . The molar ration is fixed at 1:1 for metal and citric acid at pH ~ 1. It was found that Ba0.85Ca0.15Ti(1-x)HfxO3 (where x=0.00, 0.05, 0.10, 0.15) crystallizes completely at around 1000 °C which is much lower than traditional methods. The structure supposedly displays a tetragonal symmetry with the P4mm space group as confirmed through x-ray diffraction (XRD) and Raman spectroscopy.

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Mono and co-substitution of Sr2+ and Ca2+ on the structural, electrical and optical properties of barium titanate ceramics

Cited by 39 publications

References 52 publications

Influence of Ba and Mo co-doping on the structural, electrical, magnetic and optical properties of BiFeO₃ ceramics

Influence of Ba and Mo co-doping on the structural, electrical, magnetic and optical properties of BiFeO₃ ceramics

Phase, domain, and microstructures in Sr²⁺ substituted low‐temperature sintering PZT‐based relaxor ferroelectrics

Structural, Morphological and Thermal Decomposition Studies of Calcium and Hafnium Modified BaTiO3 Electro Ceramics

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Mono and co-substitution of Sr2+ and Ca2+ on the structural, electrical and optical properties of barium titanate ceramics

Cited by 39 publications

References 52 publications

Influence of Ba and Mo co-doping on the structural, electrical, magnetic and optical properties of BiFeO3 ceramics

Influence of Ba and Mo co-doping on the structural, electrical, magnetic and optical properties of BiFeO3 ceramics

Phase, domain, and microstructures in Sr2+ substituted low‐temperature sintering PZT‐based relaxor ferroelectrics

Structural, Morphological and Thermal Decomposition Studies of Calcium and Hafnium Modified BaTiO3 Electro Ceramics

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Influence of Ba and Mo co-doping on the structural, electrical, magnetic and optical properties of BiFeO₃ ceramics

Influence of Ba and Mo co-doping on the structural, electrical, magnetic and optical properties of BiFeO₃ ceramics

Phase, domain, and microstructures in Sr²⁺ substituted low‐temperature sintering PZT‐based relaxor ferroelectrics