Electrical conductivity of nonstoichiometric Ba β-alumina single crystals prepared by a floating zone method

An Yu Zhang; Takaya Akashi; Takashi Goto

doi:10.1016/j.ssi.2003.09.016

Electrical conductivity of nonstoichiometric Ba β-alumina single crystals prepared by a floating zone method

An Yu Zhang, Takaya Akashi, Takashi Goto

Materials Processing and Characterization Division

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

3 Citations (Scopus)

Abstract

Nonstoichiometric Ba β-alumina single crystals, Ba_{1 - 0.25x}Mg_{1 - x}Al_{10 + x}O_{17 + 0.25x} (0 ≤ x ≤ 1), were prepared in the BaO-MgO-Al₂O₃ system by a floating zone method. The single crystals were cleaved parallel to a (001) plane. The electrical conductivity parallel to the cleavage plane (σ _//) was 10 to 20 times greater than that perpendicular to the cleavage plane (σ_⊥). The σ_// and σ_⊥ had the maximum at around x = 0.5. The activation energy of σ_⊥, 240 to 270 kJ/mol, was slightly greater than that of σ_//, 170 to 190 kJ/mol. The σ_// was almost independent of oxygen partial pressure (P_O2), while σ_⊥ showed a P_O2^-1/6 dependence in a low P_O2 region of P_O2 = 10^-4 to 10 ^-13 Pa.

Original language	English
Pages (from-to)	77-82
Number of pages	6
Journal	Solid State Ionics
Volume	166
Issue number	1-2
DOIs	https://doi.org/10.1016/j.ssi.2003.09.016
Publication status	Published - 2004 Jan 15

Keywords

Ba β-alumina
Electrical conductivity
Floating zone method
Nonstoichiometric
Single crystal

ASJC Scopus subject areas

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

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10.1016/j.ssi.2003.09.016

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title = "Electrical conductivity of nonstoichiometric Ba β-alumina single crystals prepared by a floating zone method",

abstract = "Nonstoichiometric Ba β-alumina single crystals, Ba1 - 0.25xMg1 - xAl10 + xO17 + 0.25x (0 ≤ x ≤ 1), were prepared in the BaO-MgO-Al2O3 system by a floating zone method. The single crystals were cleaved parallel to a (001) plane. The electrical conductivity parallel to the cleavage plane (σ //) was 10 to 20 times greater than that perpendicular to the cleavage plane (σ⊥). The σ// and σ⊥ had the maximum at around x = 0.5. The activation energy of σ⊥, 240 to 270 kJ/mol, was slightly greater than that of σ//, 170 to 190 kJ/mol. The σ// was almost independent of oxygen partial pressure (PO2), while σ⊥ showed a PO2-1/6 dependence in a low PO2 region of PO2 = 10-4 to 10 -13 Pa.",

keywords = "Ba β-alumina, Electrical conductivity, Floating zone method, Nonstoichiometric, Single crystal",

author = "Zhang, {An Yu} and Takaya Akashi and Takashi Goto",

note = "Funding Information: One of the authors (An Yu Zhang) would like to thank the Ministry of Education of China and Japanese government for financial support. The single crystals were synthesized by using the facility at the Laboratory for Advanced Materials, Institute for Materials Research, Tohoku University.",

year = "2004",

month = jan,

day = "15",

doi = "10.1016/j.ssi.2003.09.016",

language = "English",

volume = "166",

pages = "77--82",

journal = "Solid State Ionics",

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T1 - Electrical conductivity of nonstoichiometric Ba β-alumina single crystals prepared by a floating zone method

AU - Zhang, An Yu

AU - Akashi, Takaya

AU - Goto, Takashi

N1 - Funding Information: One of the authors (An Yu Zhang) would like to thank the Ministry of Education of China and Japanese government for financial support. The single crystals were synthesized by using the facility at the Laboratory for Advanced Materials, Institute for Materials Research, Tohoku University.

PY - 2004/1/15

Y1 - 2004/1/15

N2 - Nonstoichiometric Ba β-alumina single crystals, Ba1 - 0.25xMg1 - xAl10 + xO17 + 0.25x (0 ≤ x ≤ 1), were prepared in the BaO-MgO-Al2O3 system by a floating zone method. The single crystals were cleaved parallel to a (001) plane. The electrical conductivity parallel to the cleavage plane (σ //) was 10 to 20 times greater than that perpendicular to the cleavage plane (σ⊥). The σ// and σ⊥ had the maximum at around x = 0.5. The activation energy of σ⊥, 240 to 270 kJ/mol, was slightly greater than that of σ//, 170 to 190 kJ/mol. The σ// was almost independent of oxygen partial pressure (PO2), while σ⊥ showed a PO2-1/6 dependence in a low PO2 region of PO2 = 10-4 to 10 -13 Pa.

AB - Nonstoichiometric Ba β-alumina single crystals, Ba1 - 0.25xMg1 - xAl10 + xO17 + 0.25x (0 ≤ x ≤ 1), were prepared in the BaO-MgO-Al2O3 system by a floating zone method. The single crystals were cleaved parallel to a (001) plane. The electrical conductivity parallel to the cleavage plane (σ //) was 10 to 20 times greater than that perpendicular to the cleavage plane (σ⊥). The σ// and σ⊥ had the maximum at around x = 0.5. The activation energy of σ⊥, 240 to 270 kJ/mol, was slightly greater than that of σ//, 170 to 190 kJ/mol. The σ// was almost independent of oxygen partial pressure (PO2), while σ⊥ showed a PO2-1/6 dependence in a low PO2 region of PO2 = 10-4 to 10 -13 Pa.

KW - Ba β-alumina

KW - Electrical conductivity

KW - Floating zone method

KW - Nonstoichiometric

KW - Single crystal

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Electrical conductivity of nonstoichiometric Ba β-alumina single crystals prepared by a floating zone method

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