Fabrication of dense (Bi<inf>1/2</inf>K<inf>1/2</inf>)TiO<inf>3</inf> ceramics using hydrothermally derived fine powders

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Abstract

(Bi<inf>1/2</inf>K<inf>1/2</inf>)TiO<inf>3</inf> (BKT) powders were synthesized by a hydrothermal reaction using anatase TiO<inf>2</inf> and Bi(OH)<inf>3</inf> under a strong alkaline condition of [KOH] = 12 M. The reaction at 200 °C for 3 h provided a mixture of BKT and Ti-rich fibrous amorphous phases. The single-phase BKT powder with a particle size of 200 nm was successfully obtained by applying a two-step temperature profile for the reaction, which consists of temperature rising up to 160 °C and subsequent holing at 110 °C for 6 h. It was found that washing treatment of the hydrothermal BKT powder with deionized water caused leaching of K<sup>+</sup> ions, resulting in the thermal decomposition of the powder during high-temperature heat treatment. It was a key to use ethanol for the washing treatment for preventing the K<sup>+</sup> ion leaching. The ceramic sample fabricated by the ordinary firing of the hydrothermal BKT powder at 1060 °C for 2 h had a high density of 94.5 % and showed superior dielectric, ferroelectric, and piezoelectric properties.

Original languageEnglish
Pages (from-to)5970-5977
Number of pages8
JournalJournal of Materials Science
Volume50
Issue number18
DOIs
Publication statusPublished - 2015 Sep 25

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Powders
Fabrication
Washing
Leaching
Ions
Deionized water
Titanium dioxide
Temperature
Ferroelectric materials
Pyrolysis
Ethanol
Particle size
Heat treatment

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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title = "Fabrication of dense (Bi1/2K1/2)TiO3 ceramics using hydrothermally derived fine powders",
abstract = "(Bi1/2K1/2)TiO3 (BKT) powders were synthesized by a hydrothermal reaction using anatase TiO2 and Bi(OH)3 under a strong alkaline condition of [KOH] = 12 M. The reaction at 200 °C for 3 h provided a mixture of BKT and Ti-rich fibrous amorphous phases. The single-phase BKT powder with a particle size of 200 nm was successfully obtained by applying a two-step temperature profile for the reaction, which consists of temperature rising up to 160 °C and subsequent holing at 110 °C for 6 h. It was found that washing treatment of the hydrothermal BKT powder with deionized water caused leaching of K+ ions, resulting in the thermal decomposition of the powder during high-temperature heat treatment. It was a key to use ethanol for the washing treatment for preventing the K+ ion leaching. The ceramic sample fabricated by the ordinary firing of the hydrothermal BKT powder at 1060 °C for 2 h had a high density of 94.5 {\%} and showed superior dielectric, ferroelectric, and piezoelectric properties.",
author = "Manabu Hagiwara and Shinobu Fujihara",
year = "2015",
month = "9",
day = "25",
doi = "10.1007/s10853-015-9144-4",
language = "English",
volume = "50",
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journal = "Journal of Materials Science",
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publisher = "Springer Netherlands",
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T1 - Fabrication of dense (Bi1/2K1/2)TiO3 ceramics using hydrothermally derived fine powders

AU - Hagiwara, Manabu

AU - Fujihara, Shinobu

PY - 2015/9/25

Y1 - 2015/9/25

N2 - (Bi1/2K1/2)TiO3 (BKT) powders were synthesized by a hydrothermal reaction using anatase TiO2 and Bi(OH)3 under a strong alkaline condition of [KOH] = 12 M. The reaction at 200 °C for 3 h provided a mixture of BKT and Ti-rich fibrous amorphous phases. The single-phase BKT powder with a particle size of 200 nm was successfully obtained by applying a two-step temperature profile for the reaction, which consists of temperature rising up to 160 °C and subsequent holing at 110 °C for 6 h. It was found that washing treatment of the hydrothermal BKT powder with deionized water caused leaching of K+ ions, resulting in the thermal decomposition of the powder during high-temperature heat treatment. It was a key to use ethanol for the washing treatment for preventing the K+ ion leaching. The ceramic sample fabricated by the ordinary firing of the hydrothermal BKT powder at 1060 °C for 2 h had a high density of 94.5 % and showed superior dielectric, ferroelectric, and piezoelectric properties.

AB - (Bi1/2K1/2)TiO3 (BKT) powders were synthesized by a hydrothermal reaction using anatase TiO2 and Bi(OH)3 under a strong alkaline condition of [KOH] = 12 M. The reaction at 200 °C for 3 h provided a mixture of BKT and Ti-rich fibrous amorphous phases. The single-phase BKT powder with a particle size of 200 nm was successfully obtained by applying a two-step temperature profile for the reaction, which consists of temperature rising up to 160 °C and subsequent holing at 110 °C for 6 h. It was found that washing treatment of the hydrothermal BKT powder with deionized water caused leaching of K+ ions, resulting in the thermal decomposition of the powder during high-temperature heat treatment. It was a key to use ethanol for the washing treatment for preventing the K+ ion leaching. The ceramic sample fabricated by the ordinary firing of the hydrothermal BKT powder at 1060 °C for 2 h had a high density of 94.5 % and showed superior dielectric, ferroelectric, and piezoelectric properties.

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