Electrical properties of Sb-doped apatite-type lanthanum silicate materials for SOFCs

Dae Young Kim; Sung Gap Lee; Seo Hyeon Jo

Electrical properties of Sb-doped apatite-type lanthanum silicate materials for SOFCs

Dae Young Kim, Sung Gap Lee, Seo Hyeon Jo

Materials Engineering

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

Abstract

La_9.33-xSb_x(SiO₄)₆O₂ (0 < x < 2.0) ceramics were fabricated using the standard solid-state synthesis method for solid oxide electrolytes. Increasing the Sb content in apatite-type La₉.33-_xSb_x(SiO₄)₆O₂ leads to an increased unit cell volume. The room-temperature structure is hexagonal, space group P6₃ or P6₃/m, with a = 9.728 Å, and c = 7.191 Å for La₈.33Sb(SiO₄)₆O₂. The average grain size in sintered specimens was approximately 1.5 to 1.9 μm. La₉.33-_xSb_x(SiO₄)₆O₂ (1.5 < x < 2.0) apatite ceramics showed the formation of a second phase of La₂Si₂O₇, due to the volatilization of the Sb atoms. The electrical conductivity at 800 oC and activation energy of La₈33Sb(SiO₄)₆O₂ doped with 1.0 mol% Sb showed a maximum value of 3.3 x 10_-3 S cm_-1 and 1.47 eV, respectively.

Original language	English
Pages (from-to)	498-501
Number of pages	4
Journal	Journal of Ceramic Processing Research
Volume	14
Issue number	4
State	Published - 2013

Keywords

Apatite-type
Electrical conductivity
Solid oxide electrolyte

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@article{41c70555d6c041bdb4b744fd96d248ab,

title = "Electrical properties of Sb-doped apatite-type lanthanum silicate materials for SOFCs",

abstract = "La9.33-xSbx(SiO4)6O2 (0 < x < 2.0) ceramics were fabricated using the standard solid-state synthesis method for solid oxide electrolytes. Increasing the Sb content in apatite-type La9.33-xSbx(SiO4)6O2 leads to an increased unit cell volume. The room-temperature structure is hexagonal, space group P63 or P63/m, with a = 9.728 {\AA}, and c = 7.191 {\AA} for La8.33Sb(SiO4)6O2. The average grain size in sintered specimens was approximately 1.5 to 1.9 μm. La9.33-xSbx(SiO4)6O2 (1.5 < x < 2.0) apatite ceramics showed the formation of a second phase of La2Si2O7, due to the volatilization of the Sb atoms. The electrical conductivity at 800 oC and activation energy of La833Sb(SiO4)6O2 doped with 1.0 mol\% Sb showed a maximum value of 3.3 x 10-3 S cm-1 and 1.47 eV, respectively.",

keywords = "Apatite-type, Electrical conductivity, Solid oxide electrolyte",

author = "Kim, \{Dae Young\} and Lee, \{Sung Gap\} and Jo, \{Seo Hyeon\}",

year = "2013",

language = "English",

volume = "14",

pages = "498--501",

journal = "Journal of Ceramic Processing Research",

issn = "1229-9162",

number = "4",

}

TY - JOUR

T1 - Electrical properties of Sb-doped apatite-type lanthanum silicate materials for SOFCs

AU - Kim, Dae Young

AU - Lee, Sung Gap

AU - Jo, Seo Hyeon

PY - 2013

Y1 - 2013

N2 - La9.33-xSbx(SiO4)6O2 (0 < x < 2.0) ceramics were fabricated using the standard solid-state synthesis method for solid oxide electrolytes. Increasing the Sb content in apatite-type La9.33-xSbx(SiO4)6O2 leads to an increased unit cell volume. The room-temperature structure is hexagonal, space group P63 or P63/m, with a = 9.728 Å, and c = 7.191 Å for La8.33Sb(SiO4)6O2. The average grain size in sintered specimens was approximately 1.5 to 1.9 μm. La9.33-xSbx(SiO4)6O2 (1.5 < x < 2.0) apatite ceramics showed the formation of a second phase of La2Si2O7, due to the volatilization of the Sb atoms. The electrical conductivity at 800 oC and activation energy of La833Sb(SiO4)6O2 doped with 1.0 mol% Sb showed a maximum value of 3.3 x 10-3 S cm-1 and 1.47 eV, respectively.

AB - La9.33-xSbx(SiO4)6O2 (0 < x < 2.0) ceramics were fabricated using the standard solid-state synthesis method for solid oxide electrolytes. Increasing the Sb content in apatite-type La9.33-xSbx(SiO4)6O2 leads to an increased unit cell volume. The room-temperature structure is hexagonal, space group P63 or P63/m, with a = 9.728 Å, and c = 7.191 Å for La8.33Sb(SiO4)6O2. The average grain size in sintered specimens was approximately 1.5 to 1.9 μm. La9.33-xSbx(SiO4)6O2 (1.5 < x < 2.0) apatite ceramics showed the formation of a second phase of La2Si2O7, due to the volatilization of the Sb atoms. The electrical conductivity at 800 oC and activation energy of La833Sb(SiO4)6O2 doped with 1.0 mol% Sb showed a maximum value of 3.3 x 10-3 S cm-1 and 1.47 eV, respectively.

KW - Apatite-type

KW - Electrical conductivity

KW - Solid oxide electrolyte

UR - https://www.scopus.com/pages/publications/84890818039

M3 - Article

AN - SCOPUS:84890818039

SN - 1229-9162

VL - 14

SP - 498

EP - 501

JO - Journal of Ceramic Processing Research

JF - Journal of Ceramic Processing Research

IS - 4

ER -

Electrical properties of Sb-doped apatite-type lanthanum silicate materials for SOFCs

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