Particle Orientation During Tape Casting in the Fabrication of Grain‐Oriented Bismuth Titanate

Watanabe, Hidenori; Kimura, Takeshi; Yamaguchi, Takashi

doi:10.1111/j.1151-2916.1989.tb06116.x

Cited by 127 publications

(91 citation statements)

References 10 publications

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“…Several methods were examined to obtain textured ceramics. Hot-forging, templated grain growth (TGG) method and reactive TGG method were proposed [32,101,102], and highly h001i textured ceramics were obtained for several BLSFs of Bi 4 Ti 3 O 12 , NBT, and CBT [23,103,104]. It was reported that the electromechanical coupling coefficients and piezoelectric constants of highly textured BLSF ceramics were two or three times larger than those of randomly oriented ceramics.…”

Section: Ts1-mode Vibration Of Oriented Blsf Ceramicsmentioning

confidence: 99%

Resonator Characteristics of Bismuth Layer Structured Ferroelectric Materials

Andõ

Kimura

2011

Lead-Free Piezoelectrics

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Crystallographic studies of Bismuth (Bi) layer structured ferroelectric (BLSF) materials were first carried out by Aurivillius [1][2][3] and their ferroelectric or piezoelectric properties have been revealed by a large number of researchers [4-106, 108, 110-117] [39,53,63] ceramic materials have been reported in terms of resonator application. Their applicability to practical application seemed to be quite high because the electromechanical coupling factors for thickness extensional mode vibrations were between 15 and 20%, and the typical values for the mechanical quality factor (Q m ) were higher than 2,000 [39], and these properties are favorable for the oscillator applications. However, their temperature coefficient of resonance frequency (TCF) is not sufficiently low for the oscillator applications which require a stable resonance frequency with fine tolerance against various condition changes such as temperature changes.Ando and coresearchers have studied the resonance characteristics of the BLSF materials, and reported that SrBi 2 Nb 2 O 9 (SBN) ceramic material has small TCF values and can be used in the fine tolerance oscillator applications [38,44,72,73,[84][85][86]89]. Single mode resonant characteristics were also successfully obtained for the second harmonic of the thickness extensional (TE2) mode generated by a double-layered resonator structure with SBN material [38,84]. Moreover, a highly stable resonator characteristic at high temperatures is expected for the SBN since its measured Curie temperature was around 400 C [38,44,72,85], which is higher than that of typical lead containing materials such as PZT-or PbTiO3-based ceramics.

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Section: Ts1-mode Vibration Of Oriented Blsf Ceramicsmentioning

confidence: 99%

Resonator Characteristics of Bismuth Layer Structured Ferroelectric Materials

Andõ

Kimura

2011

Lead-Free Piezoelectrics

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“…to form slurry which is tape-cast by a doctor-blade technique. The shear stresses acting on the slurry during casting align the platelike particles with their plate face parallel to the sheet surface [9,35]. The cast sheet is cut and laminated to form a green compact.…”

Section: Introductionmentioning

confidence: 99%

Processing and Properties of Textured Bismuth Layer-Structured Ferroelectrics

Kimura

Tani

2011

Lead-Free Piezoelectrics

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Bismuth layer-structured ferroelectrics (BLSFs) are one of the candidates for lead-free piezoelectrics for high temperature and high frequency applications. BLSFs have a layer structure with a general formula (Bi 2 O 2 )(A mÀ1 B m O 3m+1 ), where A denotes mono-, di-, or trivalent ions with a large ionic radius, and B denotes tetra-, penta-, or hexavalent ions with a small ionic radius, and m is an integer between 1 and 5. The crystal structure is composed of pseudo-perovskite blocks (A mÀ1 B m O 3m+1 )

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“…As-synthesized BLSF particles often exhibit platelike shapes with a well-developed c-face [7]. The c-face laminated texture can be easily produced with conventional fabrication techniques such as hot pressing and tape casting [4,[7][8][9][10]. However, a new method is needed to orient the c-axis normal to the lamination.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of crystal-oriented barium-bismuth titanate ceramics in high magnetic field and subsequent reaction sintering

Tanaka

Tomita

Furushima

et al. 2009

Science and Technology of Advanced Materials

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High magnetic field was applied to fabricate novel lead-free piezoelectric ceramics with a textured structure. A compact of crystallographically oriented grains was prepared by dry forming in a high magnetic field from a mixed slurry of bismuth titanate and barium titanate powders. Bismuth titanate particles with a size of about 1 µm were used as the host material. In the forming process, the slurry was poured into a mold and set in a magnetic field of 10 T until completely dried. Bismuth titanate particles were highly oriented in the slurry under the magnetic field. The dried powder compact consisted of highly oriented bismuth titanate particles and randomly oriented barium titanate particles. Barium bismuth titanate ceramics with a-and b-axis orientations were successfully produced from the dried compact by sintering at temperatures above 1100• C.

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Particle Orientation During Tape Casting in the Fabrication of Grain‐Oriented Bismuth Titanate

Cited by 127 publications

References 10 publications

Resonator Characteristics of Bismuth Layer Structured Ferroelectric Materials

Resonator Characteristics of Bismuth Layer Structured Ferroelectric Materials

Processing and Properties of Textured Bismuth Layer-Structured Ferroelectrics

Fabrication of crystal-oriented barium-bismuth titanate ceramics in high magnetic field and subsequent reaction sintering

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