Solubility of La–Mg and La–Al in BaTiO3

Watanabe, Kiyohiko; Ohsato, Hitoshi; Kishi, Hiroshi; Okino, Yoshikazu; Kohzu, Noriyuki; Iguchi, Yoshiaki; Okuda, Takashi

doi:10.1016/s0167-2738(98)00030-7

Cited by 67 publications

(25 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The grain size decreased, when Dy-doping concentration is 0.75 mol%, the grain size reached minimum value, and then increased and many big grains were founded with the increase of Dy concentration. Ohsato reported that there were three stages of substitution of rare earth element in BaTiO 3 [12].In the present study three different doping mechanisms can be also proposed according to the testing results including resistivity, lattice parameter and microstructure: …”

Section: Resultsmentioning

confidence: 67%

Microstructure and dielectric properties of dysprosium-doped barium titanate ceramics

Chen

et al. 2005

Cerâmica

View full text Add to dashboard Cite

The substitution behavior and lattice parameter of barium titanate between solid_solubility with a dopant concentration in the range of 0.25 to 1.5 mol% are studied. The influences of dysprosium-doped fraction on the grain size and dielectric properties of barium titanate ceramic, including dielectric constant and breakdown electric field strength, are investigated via scanning electronic microscopy, X-ray diffraction and electric property tester. The results show that, at a dysprosium concentration of 0.75 mol%, the abnormal grain growth is inhibited and the lattice parameters of grain rise up to the maximum because of the lowest vacancy concentration. In addition, the finegrain and high density of barium titanate ceramic result in its excellent dielectric properties. The relative dielectric constant (25 °C) reaches to 4100. The temperature coefficient of the capacitance varies from -10 to 10% within the temperature range of -15 °C -100 °C, and the breakdown electric field strength (alternating current) achieves 3.2 kV/mm. These data suggest that our barium titanate could be used in the manufacture of high voltage ceramic capacitors.

show abstract

Section: Resultsmentioning

confidence: 67%

Microstructure and dielectric properties of dysprosium-doped barium titanate ceramics

Chen

et al. 2005

Cerâmica

View full text Add to dashboard Cite

show abstract

“…Watanabe et al [23] reported that there were mainly three stages of substitution of rare earth elements in BaTiO 3 . In the first two stages, doping ions replaced the original ions located in the lattice on the A or B site, respectively.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…In the first two stages, doping ions replaced the original ions located in the lattice on the A or B site, respectively. The third stage was over the limit of substitution and a secondary phase appeared [23] .The ionic radii of Ba 2+ or Sr 2+ in 12 coordinates and Ti 4+ , Sn 4+ in 6 coordinates are 0.161 nm, 0.144 nm, 0.061 nm and 0.071 nm, respectively. The ionic radii of Y 3+ in 12 and 6 coordinates are 0.106 nm and 0.086 nm [24] .…”

mentioning

confidence: 99%

See 1 more Smart Citation

Structural and dielectric properties of Y2O3-doped Ba0.92Sr0.08Ti0.95Sn0.05O3 ceramics

2009

Trans. Tianjin Univ.

View full text Add to dashboard Cite

Abstract：The structural and dielectric properties of Ba 0.92 Sr 0.08 Ti 0.95 Sn 0.05 O 3 (BSTS)+x(molar ratio, %)Y 3+ ceramics are investigated. Combining the lattice parameters and the distortion of crystal lattice, an alternation of substitution preference of Y 3+ ion for the host cations in perovskite lattice is found. Owing to Y 3+ ion entering the A site, the maximum dielectric constant is 5 627 for 1.25% Y 3+ -doped samples; when Y 3+ ion is more than 1.25%, it tends to occupy the B site in perovskite lattice, causing a drop in the dielectric constant. Owing to the appearance of oxygen vacancy, the optimized dielectric loss is 0.004 for 1.25% Y 3+ -doped samples. The thermal stability of BSTS ceramics is significantly improved and the Curie temperature shifts to lower value with the amount of Y 2 O 3 increased, making it a superior candidate for capacitor applications.In recent years, materials with a high dielectric constant and lead-free compositions have attracted much interest for environment-friendly applications. BaTiO 3 -based ceramics is widely used in the manufacture of thermistors and multilayer ceramic capacitors(MLCC) owing to their high dielectric permittivity. The perovskite type BaTiO 3 -based ceramics such as barium strontium titanate(Ba 1-x Sr x TiO 3 , BST)has received extensive attention because of their predominant properties of dielectric behavior and phase transition. In order to obtain excellent dielectric properties such as higher dielectric constant, lower dissipation factor, adjustable Curie temperature, thermal stability and other properties, much effort has been made by the way of substitution for the host cations in perovskite lattice. It has been well documented [1][2][3][4][5][6] that small amounts of impurity ions can dramatically modify the properties of BST ceramics in general. The influence of rare earth dopants such as La 2 O 3 [7,8] , Nb 2 O 5 [9-16] , Dy 2 O 3 [17] , Y 2 O 3 [18,19] on the dielectric properties of BST has been widely researched. Sn-doped BaTiO 3 -based ceramics exhibits paraelectric or ferroelectric properties depending on its specific composition and temperature. In addition, the nonlinear dielectric property of Sn-doped BaTiO 3 -based ceramics makes it attractive to electrically tunable microwave devices [20,21] . The Y 2 O 3 -doped Ba 0.92 Sr 0.08 Ti 0.95 Sn 0.05 O 3 (BSTS)ceramics is described in this paper as superior candidates for lead-free ferroelectric materials to reduce environmental damages, and it was prepared by conventional solid state method. The yttrium ion as dopant was added to improve the dielectric properties. The lattice parameters were calculated through X-ray diffraction (XRD) analysis. The microstructural and dielectric properties of all specimens were investigated for capacitor applications. ExperimentThe general formula of the materials was BSTS+ xY 3+ , where x=0-1.75% (molar ratio). The samples were prepared with the two-stage method to acquire a pure phase of perovskite. In the first stage, the carbonate and oxide powder of...

show abstract

“…It was stated that there are two stages of substitution of rare earth elements in BaTiO 3 . 17) In the first stage, Ti 4þ ions located on the Ba site are replaced by the rare earth elements. In the second stage, Ba 2þ ions on the A site are also mainly replaced by rare earth elements.…”

Section: Xrd Studies and Morphologymentioning

confidence: 99%

Structural and Optical Characteristics of BaTiO<SUB>3</SUB>:Yb<SUP>3+</SUP> Powders

Murillo¹,

Romo²,

Hernández³

et al. 2009

Mater. Trans.

View full text Add to dashboard Cite

Yb3þ doped Barium Titanate powders were prepared by the sol-gel method in order to study their structural and luminescent properties. These powders have potential to be used to prepare films for luminescent screens. The synthesized powders were obtained at 2, 4 and 8% mol Yb 3þ doped BaTiO 3 . In order to determine organic compound decomposition, weight loss, and establish the crystallization process, we performed TGA and DTA analyses. The powders were also thermally treated at temperatures ranging from 700 to 1200 C in order to study the structure evolution. Pure doped BaTiO 3 powders were carefully studied by X-ray diffraction (XRD). Observations of the powders using scanning electron microscopy (SEM) were done in order to correlate the grain size with the luminescent properties. A comparative study of the spectroscopy properties constituted by emission, absorption spectra, and fluorescence decay measurements using NIR excitation were done. The Yb 3þ ions pairs emission was measured in the green region at about 500 nm when pumping at 940 nm.

show abstract

Solubility of La–Mg and La–Al in BaTiO3

Cited by 67 publications

References 5 publications

Microstructure and dielectric properties of dysprosium-doped barium titanate ceramics

Microstructure and dielectric properties of dysprosium-doped barium titanate ceramics

Structural and dielectric properties of Y2O3-doped Ba0.92Sr0.08Ti0.95Sn0.05O3 ceramics

Structural and Optical Characteristics of BaTiO<SUB>3</SUB>:Yb<SUP>3+</SUP> Powders

Contact Info

Product

Resources

About