Preparation of lanthanum silicate electrolyte with high conductivity and high chemical stability

Atsushi Mineshige; Hikaru Hayakawa; Takuma Nishimoto; Akie Heguri; Tetsuo Yazawa; Yuki Takayama; Yasushi Kagoshima; Hidekazu Takano; Shingo Takeda; Junji Matsui

doi:10.1016/j.ssi.2018.02.002

Preparation of lanthanum silicate electrolyte with high conductivity and high chemical stability

Atsushi Mineshige, Hikaru Hayakawa, Takuma Nishimoto, Akie Heguri, Tetsuo Yazawa, Yuki Takayama, Yasushi Kagoshima, Hidekazu Takano, Shingo Takeda, Junji Matsui

Institute of Multidisciplinary Research for Advanced Materials (IMRAM)

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

Effects of dopant content and synthesis temperature on phase relations and conducting behavior of lanthanum silicate, La_9.33+xSi₆O_26+1.5x (LSO) electrolytes were investigated. The La-excess-type Fe-doped LSO, La₁₀(Si_5.5Fe_0.5)O_26.75 synthesized at 1973 K showed lower grain boundary as well as grain interior resistances, and then, had high total conductivity (6.9 × 10⁻³ S cm⁻¹ at 873 K and 3.6 × 10⁻⁵ S cm⁻¹ at 573 K). In addition, the chemical instability owing to a high lanthanum activity in the La-excess-type LSO (x = 0.67) specimen could be eliminated by incorporating iron into the specimen. The synchrotron radiation microbeam X-ray diffraction technique revealed that this specimen contains a small amount of new secondary phase, which differs from the situation found in a highly conductive but chemically unstable Al-doped LSO specimen with the same x value and the same synthesis temperature.

Original language	English
Pages (from-to)	223-227
Number of pages	5
Journal	Solid State Ionics
Volume	319
DOIs	https://doi.org/10.1016/j.ssi.2018.02.002
Publication status	Published - 2018 Jun

Keywords

Apatite
Lanthanum silicate
Synchrotron radiation microbeam

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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10.1016/j.ssi.2018.02.002

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@article{132a1972124345eca25fd62f8f21ee0b,

title = "Preparation of lanthanum silicate electrolyte with high conductivity and high chemical stability",

abstract = "Effects of dopant content and synthesis temperature on phase relations and conducting behavior of lanthanum silicate, La9.33+xSi6O26+1.5x (LSO) electrolytes were investigated. The La-excess-type Fe-doped LSO, La10(Si5.5Fe0.5)O26.75 synthesized at 1973 K showed lower grain boundary as well as grain interior resistances, and then, had high total conductivity (6.9 × 10−3 S cm−1 at 873 K and 3.6 × 10−5 S cm−1 at 573 K). In addition, the chemical instability owing to a high lanthanum activity in the La-excess-type LSO (x = 0.67) specimen could be eliminated by incorporating iron into the specimen. The synchrotron radiation microbeam X-ray diffraction technique revealed that this specimen contains a small amount of new secondary phase, which differs from the situation found in a highly conductive but chemically unstable Al-doped LSO specimen with the same x value and the same synthesis temperature.",

keywords = "Apatite, Lanthanum silicate, Synchrotron radiation microbeam",

author = "Atsushi Mineshige and Hikaru Hayakawa and Takuma Nishimoto and Akie Heguri and Tetsuo Yazawa and Yuki Takayama and Yasushi Kagoshima and Hidekazu Takano and Shingo Takeda and Junji Matsui",

note = "Funding Information: This work was partially supported by A-STEP Full-Scale R&D (High-risk challenge) Program (# AS2524056L ), Japan Science and Technology Agency (JST) and KAKENHI Grant Number 15K05649 , Japan Society for the Promotion of Science (JSPS). The synchrotron radiation experiments were performed at the BL24XU of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal Nos. 2014B3250, 2015A3200, 2015B3250, 2016A3200, and 2016A3250). Publisher Copyright: {\textcopyright} 2018 Elsevier B.V.",

year = "2018",

month = jun,

doi = "10.1016/j.ssi.2018.02.002",

language = "English",

volume = "319",

pages = "223--227",

journal = "Solid State Ionics",

issn = "0167-2738",

publisher = "Elsevier",

}

TY - JOUR

T1 - Preparation of lanthanum silicate electrolyte with high conductivity and high chemical stability

AU - Mineshige, Atsushi

AU - Hayakawa, Hikaru

AU - Nishimoto, Takuma

AU - Heguri, Akie

AU - Yazawa, Tetsuo

AU - Takayama, Yuki

AU - Kagoshima, Yasushi

AU - Takano, Hidekazu

AU - Takeda, Shingo

AU - Matsui, Junji

N1 - Funding Information: This work was partially supported by A-STEP Full-Scale R&D (High-risk challenge) Program (# AS2524056L ), Japan Science and Technology Agency (JST) and KAKENHI Grant Number 15K05649 , Japan Society for the Promotion of Science (JSPS). The synchrotron radiation experiments were performed at the BL24XU of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal Nos. 2014B3250, 2015A3200, 2015B3250, 2016A3200, and 2016A3250). Publisher Copyright: © 2018 Elsevier B.V.

PY - 2018/6

Y1 - 2018/6

N2 - Effects of dopant content and synthesis temperature on phase relations and conducting behavior of lanthanum silicate, La9.33+xSi6O26+1.5x (LSO) electrolytes were investigated. The La-excess-type Fe-doped LSO, La10(Si5.5Fe0.5)O26.75 synthesized at 1973 K showed lower grain boundary as well as grain interior resistances, and then, had high total conductivity (6.9 × 10−3 S cm−1 at 873 K and 3.6 × 10−5 S cm−1 at 573 K). In addition, the chemical instability owing to a high lanthanum activity in the La-excess-type LSO (x = 0.67) specimen could be eliminated by incorporating iron into the specimen. The synchrotron radiation microbeam X-ray diffraction technique revealed that this specimen contains a small amount of new secondary phase, which differs from the situation found in a highly conductive but chemically unstable Al-doped LSO specimen with the same x value and the same synthesis temperature.

AB - Effects of dopant content and synthesis temperature on phase relations and conducting behavior of lanthanum silicate, La9.33+xSi6O26+1.5x (LSO) electrolytes were investigated. The La-excess-type Fe-doped LSO, La10(Si5.5Fe0.5)O26.75 synthesized at 1973 K showed lower grain boundary as well as grain interior resistances, and then, had high total conductivity (6.9 × 10−3 S cm−1 at 873 K and 3.6 × 10−5 S cm−1 at 573 K). In addition, the chemical instability owing to a high lanthanum activity in the La-excess-type LSO (x = 0.67) specimen could be eliminated by incorporating iron into the specimen. The synchrotron radiation microbeam X-ray diffraction technique revealed that this specimen contains a small amount of new secondary phase, which differs from the situation found in a highly conductive but chemically unstable Al-doped LSO specimen with the same x value and the same synthesis temperature.

KW - Apatite

KW - Lanthanum silicate

KW - Synchrotron radiation microbeam

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U2 - 10.1016/j.ssi.2018.02.002

DO - 10.1016/j.ssi.2018.02.002

M3 - Article

AN - SCOPUS:85042176125

SN - 0167-2738

VL - 319

SP - 223

EP - 227

JO - Solid State Ionics

JF - Solid State Ionics

ER -

Preparation of lanthanum silicate electrolyte with high conductivity and high chemical stability

Abstract

Keywords

ASJC Scopus subject areas

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