Mechanical and electrical properties of preferentially oriented Naβ-alumina ceramics

Kousei Shimokawa, Akira Kishimoto

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Naβ-alumina is a two-dimensional ionic conductor in which conducting planes of Na+ ion are separated by insulating spinel block layers. For practical use, Naβ-alumina needs not only high ionic conductivity but also mechanical reliability. Therefore, we prepared preferentially oriented Naβ-alumina ceramics by hot pressing and evaluated the ionic conductivity and mechanical strength. The ionic conductivity perpendicular to the c-axis-oriented plane was five times higher than that parallel to c-axis. From the preferentially oriented Naβ-alumina ceramics three types of test pieces were cut for a three-point bending test. In one type of test piece, the longest side was parallel to the hot-pressing direction, while the longest sides were perpendicular to that direction in the other types of test pieces. The latter test pieces showed mechanical strength 1.5 times that of the former.

Original languageEnglish
Pages (from-to)376-378
Number of pages3
JournalNippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
Volume110
Issue number1281
Publication statusPublished - May 2002
Externally publishedYes

Fingerprint

Aluminum Oxide
Electric properties
Alumina
Ionic conductivity
aluminum oxides
electrical properties
mechanical properties
ceramics
Mechanical properties
ion currents
Hot pressing
hot pressing
Strength of materials
Bending tests
spinel
Ions
conductors
conduction
ions
Direction compound

Keywords

  • Ionic conductivity
  • Mechanical strength
  • Naβ-alumina
  • Orientation

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

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AB - Naβ-alumina is a two-dimensional ionic conductor in which conducting planes of Na+ ion are separated by insulating spinel block layers. For practical use, Naβ-alumina needs not only high ionic conductivity but also mechanical reliability. Therefore, we prepared preferentially oriented Naβ-alumina ceramics by hot pressing and evaluated the ionic conductivity and mechanical strength. The ionic conductivity perpendicular to the c-axis-oriented plane was five times higher than that parallel to c-axis. From the preferentially oriented Naβ-alumina ceramics three types of test pieces were cut for a three-point bending test. In one type of test piece, the longest side was parallel to the hot-pressing direction, while the longest sides were perpendicular to that direction in the other types of test pieces. The latter test pieces showed mechanical strength 1.5 times that of the former.

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