Effects of Rare-Earth Oxides on the Reliability of X7R Dielectrics

Sakabe, Yukio; Hamaji, Yukio; Sano, Harunobu; Wada, Naohisa

doi:10.1143/jjap.41.5668

Cited by 140 publications

(109 citation statements)

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“…The atomic substitution effects of rareearth R and Mg ions on BaTiO 3 ceramic materials have been investigated to satisfy the requirements of low dielectric loss, low microphonics, and long lifetime for the application of BaTiO 3 ceramics. [1][2][3][4][5][6][7] The Gd-and Mg-substituted barium titanate crystals (Ba 1−x Gd x )(Ti 1−x=2 Mg x=2 )O 3 were found as one of the suitable materials from the viewpoint of the dielectric properties and stability of ceramics. 8) Structure fluctuations of BaTiO 3 in the paraelectric cubic phase, especially the fluctuation of Ti ions, have also been discussed extensively in connection with the successive phase transition mechanism of BaTiO 3 .…”

Section: Introductionmentioning

confidence: 99%

Structure fluctuation in Gd- and Mg-substituted BaTiO₃with cubic structure

Takeda

Zhang

Moriyoshi

et al. 2017

Jpn. J. Appl. Phys.

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Gd-and Mg-substituted barium titanate crystals (Ba 1%x Gd x )(Ti 1%x/2 Mg x/2 )O 3 with the Gd composition range of x > 0.1 show no ferroelectric phase transition. To discuss atomic thermal fluctuations in such unusual barium titanate crystals with cubic symmetry, accurate crystal structure analyses were performed by the maximum entropy method (MEM)/Rietveld method with the split-atom model and anharmonic temperature factor model using high-energy synchrotron radiation X-ray diffraction data. The off-centered positions of Gd ions at the Ba site in the probability density function were clearly observed at a low temperature but smeared in the high-temperature region by the over-barrier motion of Gd ions.

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Section: Introductionmentioning

confidence: 99%

Structure fluctuation in Gd- and Mg-substituted BaTiO₃with cubic structure

Takeda

Zhang

Moriyoshi

et al. 2017

Jpn. J. Appl. Phys.

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“…8 Especially rare-earth-doped BTO ceramics are known to exhibit temperature stabilized dielectric properties. [9][10][11][12] Y, Dy, Ho and Er dopants sometimes referred as \magic dopants", can improve the lifetime of capacitor under certain formulations and heat treatment, however other trivalent dopants do not show this type of marked improvement. 13 Morrison et al reported that the La-doped BTO ceramics have shown enhanced dielectric constant $ 10,000 and its transition temperature (T C ) decreased with increasing La concentration.…”

Section: Introductionmentioning

confidence: 99%

Crystal structure, dielectric, ferroelectric and energy storage properties of La-doped BaTiO3 semiconducting ceramics

Puli

Adireddy

et al. 2015

J. Adv. Dielect.

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Polycrystalline La-doped BaTiO 3 (Ba ð1ÀxÞ La x TiO 3 ) [x ¼ 0; 0:0005; 0:001; 0:003] ceramics (denoted as BTO,BLT1,BLT2,BLT3) were synthesized by conventional solid-state reaction method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and Raman spectroscopy. XRD and Raman spectra revealed single-phase tetragonal perovskite crystalline structure. Well-saturated polarization-electric field (P-E) hysteresis loops were observed with the measurement frequency of 50 Hz at room temperature and confirmed ferroelectric nature of these ceramics and a high recoverable electrical energy storage density of 0.350 J/cm 3 with energy efficiency ðnÞ $ 9%, which is useful in energy storage capacitor applications. Dielectric studies revealed anomalies around 415-420 K and near the Curie temperature. The latter is attributed to the ferroelectric to paraelectric phase transition. Better dielectric performances were obtained for La-doped samples sintered at 1350 C for 4 h. Grain growth is inhibited with lanthanum (La) incorporation into the BTO lattice. Room temperature semiconducting behavior with positive temperature coefficient of resistivity (PTCR) behavior at T C is attributed to electron compensation mechanism.

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“…In an effort to overcome deterioration under DC bias as explained earlier, doping with rare-earth elements was attempted and found to be effective. 41), 42) A large number of studies on rare-earth element substitution in BaTiO 3 have been carried out subsequently to reveal the mechanisms involved. Tsur et al 43), 44) described the effects of rare-earth doping in terms of defect chemistry, reporting that Er, Y, Ho and Dy occupy both Ba sites and Ti sites in BaTiO 3 , while La occupies only Ba sites.…”

Section: Rare-earth Dopingmentioning

confidence: 99%

“…They reported that in Ba excess materials, Ho occupies Ti sites, while in Ti excess materials, Ho occupies Ba sites. Sakabe et al 41) investigated the solution behavior of La, Sm, Dy and Yb in BaTiO 3 using XRD, as well as their effect on the long-term performance of MLCCs. They reported that La occupies Ba sites and Dy occupies both Ba and Ti sites.…”

Section: Rare-earth Dopingmentioning

confidence: 99%

Multi layer ceramic capacitors materials research using first-principles calculations

Moriwake

2014

J. Ceram. Soc. Japan

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In this paper the multi-layer ceramic capacitors (MLCCs) materials research using first-principles calculations are explained. For example, doping with 3d transition metals, particularly Mn, is thought to play an important role in determining the reliability of dielectrics used in MLCCs. However, a detailed examination of the electronic structure, solution energies and compensation mechanisms of these systems is lacking. The quantitative analysis of the substitution of Mn in perovskite-type BaTiO 3 using firstprinciples calculations in combination with chemical thermodynamics is reported.

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Effects of Rare-Earth Oxides on the Reliability of X7R Dielectrics

Cited by 140 publications

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Structure fluctuation in Gd- and Mg-substituted BaTiO₃with cubic structure

Structure fluctuation in Gd- and Mg-substituted BaTiO₃with cubic structure

Crystal structure, dielectric, ferroelectric and energy storage properties of La-doped BaTiO3 semiconducting ceramics

Multi layer ceramic capacitors materials research using first-principles calculations

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Effects of Rare-Earth Oxides on the Reliability of X7R Dielectrics

Cited by 140 publications

References 0 publications

Structure fluctuation in Gd- and Mg-substituted BaTiO3with cubic structure

Structure fluctuation in Gd- and Mg-substituted BaTiO3with cubic structure

Crystal structure, dielectric, ferroelectric and energy storage properties of La-doped BaTiO3 semiconducting ceramics

Multi layer ceramic capacitors materials research using first-principles calculations

Contact Info

Product

Resources

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Structure fluctuation in Gd- and Mg-substituted BaTiO₃with cubic structure

Structure fluctuation in Gd- and Mg-substituted BaTiO₃with cubic structure