Role of yttrium and magnesium in the formation of core-shell structure of BaTiO3 grains in MLCC

Kim, Chang Hoon; Park, Kum-Jin; Yoon, Young-Suk; Hong, Mun Pyo; Hong, Jinkee; Hur, Kang-Heon

doi:10.1016/j.jeurceramsoc.2007.09.042

Cited by 112 publications

(63 citation statements)

References 15 publications

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“…[1][2][3] It is reported that a rare-earth element is a dominant additive in forming a shell and the core-shell structure is well developed when the rare-earth element and magnesium are added to BT. 4 Rare-earth elements are known to exhibit useful functions of stabilizing the temperature dependence of relative dielectric constant and lowering the dissipation factor in dielectric ceramics. 5,6 As a result, the dielectric performance of the capacitors would be influenced by the amount and kind of rare-earth element.…”

Section: Introductionmentioning

confidence: 99%

Doping behaviors of dysprosium, yttrium and holmium in BaTiO3 ceramics

Park

Kim

Yoon

et al. 2009

Journal of the European Ceramic Society

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129

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Section: Introductionmentioning

confidence: 99%

Doping behaviors of dysprosium, yttrium and holmium in BaTiO3 ceramics

Park

Kim

Yoon

et al. 2009

Journal of the European Ceramic Society

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129

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“…These chemical compositions of the samples are known to easily reveal the core/shell structure after sintering [20][21][22]. With a suitable amount, the two different rare-earth dopants, Y and Dy, can respectively maintain and loose the coherency at the core/shell interface [23,24], and thus the core/shell grains can have a high and low residual strain in them.…”

Section: Methodsmentioning

confidence: 99%

Oxidation-induced strain relaxation and related dielectric-temperature behavior in core/shell grained BaTiO3

Jeon

Kang

2015

J Electroceram

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The effect of oxidation on dielectric-temperature behavior of core/shell grained BaTiO 3 was studied in an attempt to reveal the prime governing parameter of dielectrictemperature behavior. BaTiO 3 samples doped with 3 mol% Y 2 O 3 or 3 mol% Dy 2 O 3 with the same effective charges were sintered in a reducing atmosphere (Po 2 <10 −13 ) and oxidized at 1050-1250°C for 10 h in air. In the Y-doped samples, as the oxidation temperature increased, the fraction of the grains with ferroelectric domains in the shell increased from 18 to 54 % and the residual strain decreased. With an increased domain fraction, the dielectric-temperature behavior became poor, and a dielectric peak appeared. On the other hand, all the Dy-doped and air-annealed samples exhibited relatively high fractions of grains with ferroelectric domains in the shell, 32 % at 1050°C and 63 % at 1250°C, indicating a considerable reduction of residual strain in all the samples. The temperature stability of the Dy-doped samples was poor, and there was a dielectric peak, irrespective of the oxidation temperature. This difference in dielectric response between the Ydoped and Dy-doped samples reveals that the prime factor governing the dielectric-temperature stability is the residual strain in the core/shell grains rather than the previously suggested factors of defect concentration, dopant concentration in the shell and the occupational sites of rare-earth dopants.

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“…The effects of various kinds and amounts of additives have been studied [2,4,5,9,10,[15][16][17][18][19][20][21][22], including in particular those of rare earth elements with intermediate ionic radii (Dy, Ho, Y and Er) [9,10,[19][20][21][22][23]. In the case of rare earth doping, high insulation resistance can be maintained for a long time, which enables the realization of thinner dielectric layers and extended life time in the use of MLCCs [24].…”

Section: Introductionmentioning

confidence: 99%

Effects of core/shell volumetric ratio on the dielectric-temperature behavior of BaTiO3

et al. 2014

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Two sets of (Mg,Y)-doped BaTiO 3 samples were prepared to investigate the effects of the core/shell volumetric ratio on the dielectric-temperature behavior of BaTiO 3 : one set with samples of the same grain size but different core sizes and the other with samples of the same core size but different shell thicknesses. The microstructural variation of the samples was characterized and their dielectric properties were measured. For both sets of samples, the temperature stability of the dielectric properties was generally improved with a reduction of the volumetric shell ratio regardless of the grain and core sizes. There existed, however, a limit of the reduction; for the studied range, shell thickness of one third of the core radius appeared to be an optimum thickness for the given amounts of dopants. It was concluded that the volumetric shell ratio should be optimized so as not to exceed a specific limit, for our case two thirds of the grain volume, to secure temperature stability of the dielectric properties of BaTiO 3 .

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Role of yttrium and magnesium in the formation of core-shell structure of BaTiO3 grains in MLCC

Cited by 112 publications

References 15 publications

Doping behaviors of dysprosium, yttrium and holmium in BaTiO3 ceramics

Doping behaviors of dysprosium, yttrium and holmium in BaTiO3 ceramics

Oxidation-induced strain relaxation and related dielectric-temperature behavior in core/shell grained BaTiO3

Effects of core/shell volumetric ratio on the dielectric-temperature behavior of BaTiO3

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