Influence of the Kinds of Aluminum Source on the Preferential Orientation and Properties of Naβ-Alumina Ceramics
Influence of the Kinds of Aluminum Source on the Preferential Orientation and Properties of Naβ-Alumina Ceramics
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DOI：
10.2109/jcersj.114.719
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发表时间：
2006-08
影响因子：
1.1
通讯作者：
H. Asaoka;Rie Ogawa;H. Hayashi;A. Kishimoto
中科院分区：
文献类型：
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作者：
H. Asaoka;Rie Ogawa;H. Hayashi;A. Kishimoto
Naβ-氧化铝是一种二维离子导体，其中绝缘尖晶石层分隔Na +离子的导电平面。Naβ-Al_2O_3陶瓷是一种强离子导体，机械性能可靠，有望用作固体电解质。因此，我们以三种铝源为原料，采用热压法制备了c面取向的Naβ-Al 2 O3陶瓷，并对其离子电导率和机械强度进行了评价。在所有样品中，垂直于压制方向的离子电导率是平行方向的10倍。平行于压制方向的机械强度比垂直方向的机械强度大1.5倍。由50mol%片状三水铝石和50mol%球形氧化铝的混合物制成的样品显示出最大的择优取向和有利的相对密度。
Naβ-alumina is a two-dimensional ionic conductor in which insulating spinel layers separate conducting planes of Na + ions. Naβ-alumina ceramics is expected to be used as solid electrolytes because it is strong ionic conductor and mechanically reliable. Therefore, we prepared c-plane-oriented Naβ-alumina ceramics from three aluminum sources using a hot-pressing method and evaluated their ionic conductivity and mechanical strength. In all samples, the ionic conductivity perpendicular to the pressing direction was ten times greater than in the parallel direction. The mechanical strength parallel to the pressing direction was 1.5 times larger than that in the perpendicular direction. The samples made from a mixture of 50 mol% platelike gibbsite and 50 mol% spherical alumina showed the maximum preferential orientation with favorable relative density.