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簡便な高圧下磁化測定用セラミックアンビル型圧力セル(mCAC)

Ceramic anvil high pressure cell (mCAC) for magnetic measurements

立岩 尚之   ; 芳賀 芳範   

Tateiwa, Naoyuki; Haga, Yoshinori

高圧下磁化測定を目的としたセラミックアンビルセルを提案する。アンビル先端直径が1.8mmの場合最高圧力は2.4GPaであり、0.6mmの場合7.6GPaである。セラミック複合材料のアンビルは5GPa以上の超高圧発生が可能であることを明らかにした。本セルの磁気バックグラウンドはインデンタセルより大幅に小さく、磁化の小さな反強磁性化合物に適用可能である。

A miniature opposed-anvil high-pressure cell has been developed for magnetic measurement in a commercial superconducting quantum interference device (SQUID) magnetometer. The maximum pressure $$P_{rm max}$$ depends on the culet size of the anvil: the values of $$P_{rm max}$$ are 2.4 and 7.6 GPa for 1.8 and 0.6 mm culet anvils, respectively. We revealed that the composite ceramic anvil has potential to generate high pressure above 5 GPa. The background magnetization of the Cu-Be gasket is generally two orders of magnitude smaller than the Ni-Cr-Al gasket for the indenter cell. The present cell can be used not only with ferromagnetic and superconducting materials with large magnetization but also with antiferromagnetic compounds with smaller magnetization.

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