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纳米CaF2离子电导率和介电常数与流体静压力的关系

DOI: 10.11858/gywlxb.2002.03.002, PP. 167-175

Keywords: 氟离子导体,纳米CaF2,离子电导率,介电常数,流体静压力

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Abstract:

采用惰性气体蒸发和真空原位加压方法,制备了具有清洁界面的平均粒度为14nm的纳米固体CaF2,并在0.1MPa~2.2GPa压力范围内52个不同的静水压下,分别详细测量出其离子电导率σ和相对介电常数随压力变化的规律。讨论指出:(1)离子迁移通道受压后的变化(大于、等于或小于最佳值),是影响离子电导率-压力曲线峰值的主要因素;(2)当压力从0.66GPa再增加时,lgσ分三段线性下降,可归因于纳米晶体的三种自由体积;(3)界面层空间电荷极化是造成纳米CaF2相对介电常数较大的原因,由此可理解介电常数的压力效应,了提高产品的氟离子电导率,用真空原位加压法制备纳米材料时,应当采用高于0.66GPa的压力。

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