Thermal expansion behavior of La-doped (Ba0.5Sr 0.5Co0.8Fe0.2)O3-δ cathode material

Bo Kyung Kang; Ho Chang Lee; Young Woo Heo; Jeong Joo Kim; Jae Yuk Kim; Joon Hyung Lee

doi:10.1016/j.ceramint.2013.04.012

Thermal expansion behavior of La-doped (Ba_0.5Sr _0.5Co_0.8Fe_0.2)O_3-δ cathode material

Bo Kyung Kang, Ho Chang Lee, Young Woo Heo, Jeong Joo Kim, Jae Yuk Kim, Joon Hyung Lee

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

11 Scopus citations

Abstract

In this study, the thermal expansion behavior of the BSCF (Ba _0.5Sr_0.5Co_0.8Fe_0.2O _3-δ) and La-doped BSCF, i.e., (Ba_0.5Sr _0.5)_0.7La_0.3Co_0.8Fe _0.2O_3-δ (BSLCF30) was systematically examined. The thermal expansion rate of the sintered body increased rapidly at around 500° C. It was found from the TG analysis that the oxygen vacancies formed around this temperature. When La is doped in the A-site of BSCF, more weight loss was observed over 500 °C compared to BSCF, which shows that La doping induces oxygen vacancies. Consequently, chemical expansion of the B-site cations occurred. Therefore, the thermal expansion coefficient (TEC) of BSLCF was much bigger than that of the BSCF. When the samples were heated and cooled in an Ar atmosphere, hysteresis of TEC was observed since re-oxidation cannot occur during cooling.

Original language	English
Pages (from-to)	8267-8271
Number of pages	5
Journal	Ceramics International
Volume	39
Issue number	7
DOIs	https://doi.org/10.1016/j.ceramint.2013.04.012
State	Published - Sep 2013

Keywords

C. Thermal expansion
Cathode
Chemical expansion
Oxygen vacancy
Solid oxide fuel cell

Access to Document

10.1016/j.ceramint.2013.04.012

Cite this

@article{4588dd17f6c348d2a835906937d0cb7f,

title = "Thermal expansion behavior of La-doped (Ba0.5Sr 0.5Co0.8Fe0.2)O3-δ cathode material",

abstract = "In this study, the thermal expansion behavior of the BSCF (Ba 0.5Sr0.5Co0.8Fe0.2O 3-δ) and La-doped BSCF, i.e., (Ba0.5Sr 0.5)0.7La0.3Co0.8Fe 0.2O3-δ (BSLCF30) was systematically examined. The thermal expansion rate of the sintered body increased rapidly at around 500° C. It was found from the TG analysis that the oxygen vacancies formed around this temperature. When La is doped in the A-site of BSCF, more weight loss was observed over 500 °C compared to BSCF, which shows that La doping induces oxygen vacancies. Consequently, chemical expansion of the B-site cations occurred. Therefore, the thermal expansion coefficient (TEC) of BSLCF was much bigger than that of the BSCF. When the samples were heated and cooled in an Ar atmosphere, hysteresis of TEC was observed since re-oxidation cannot occur during cooling.",

keywords = "C. Thermal expansion, Cathode, Chemical expansion, Oxygen vacancy, Solid oxide fuel cell",

author = "Kang, {Bo Kyung} and Lee, {Ho Chang} and Heo, {Young Woo} and Kim, {Jeong Joo} and Kim, {Jae Yuk} and Lee, {Joon Hyung}",

year = "2013",

month = sep,

doi = "10.1016/j.ceramint.2013.04.012",

language = "English",

volume = "39",

pages = "8267--8271",

journal = "Ceramics International",

issn = "0272-8842",

publisher = "Elsevier Ltd.",

number = "7",

}

TY - JOUR

T1 - Thermal expansion behavior of La-doped (Ba0.5Sr 0.5Co0.8Fe0.2)O3-δ cathode material

AU - Kang, Bo Kyung

AU - Lee, Ho Chang

AU - Heo, Young Woo

AU - Kim, Jeong Joo

AU - Kim, Jae Yuk

AU - Lee, Joon Hyung

PY - 2013/9

Y1 - 2013/9

N2 - In this study, the thermal expansion behavior of the BSCF (Ba 0.5Sr0.5Co0.8Fe0.2O 3-δ) and La-doped BSCF, i.e., (Ba0.5Sr 0.5)0.7La0.3Co0.8Fe 0.2O3-δ (BSLCF30) was systematically examined. The thermal expansion rate of the sintered body increased rapidly at around 500° C. It was found from the TG analysis that the oxygen vacancies formed around this temperature. When La is doped in the A-site of BSCF, more weight loss was observed over 500 °C compared to BSCF, which shows that La doping induces oxygen vacancies. Consequently, chemical expansion of the B-site cations occurred. Therefore, the thermal expansion coefficient (TEC) of BSLCF was much bigger than that of the BSCF. When the samples were heated and cooled in an Ar atmosphere, hysteresis of TEC was observed since re-oxidation cannot occur during cooling.

AB - In this study, the thermal expansion behavior of the BSCF (Ba 0.5Sr0.5Co0.8Fe0.2O 3-δ) and La-doped BSCF, i.e., (Ba0.5Sr 0.5)0.7La0.3Co0.8Fe 0.2O3-δ (BSLCF30) was systematically examined. The thermal expansion rate of the sintered body increased rapidly at around 500° C. It was found from the TG analysis that the oxygen vacancies formed around this temperature. When La is doped in the A-site of BSCF, more weight loss was observed over 500 °C compared to BSCF, which shows that La doping induces oxygen vacancies. Consequently, chemical expansion of the B-site cations occurred. Therefore, the thermal expansion coefficient (TEC) of BSLCF was much bigger than that of the BSCF. When the samples were heated and cooled in an Ar atmosphere, hysteresis of TEC was observed since re-oxidation cannot occur during cooling.

KW - C. Thermal expansion

KW - Cathode

KW - Chemical expansion

KW - Oxygen vacancy

KW - Solid oxide fuel cell

UR - http://www.scopus.com/inward/record.url?scp=84880287007&partnerID=8YFLogxK

U2 - 10.1016/j.ceramint.2013.04.012

DO - 10.1016/j.ceramint.2013.04.012

M3 - Article

AN - SCOPUS:84880287007

SN - 0272-8842

VL - 39

SP - 8267

EP - 8271

JO - Ceramics International

JF - Ceramics International

IS - 7

ER -

Thermal expansion behavior of La-doped (Ba_0.5Sr _0.5Co_0.8Fe_0.2)O_3-δ cathode material

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this