Abstract We study the effects of both hydrostatic and anisotropic contractions on the molecular condensation of oxygen molecules (O2) physisorbed to nanosized pores, termed “O2 nanorods”, through the magnetization measurements. Multisteps of O2 solidification accompany the reduction in structural symmetry with decreasing temperature, such that the structural change by external stress varies the stability of O2 solidification. For initial pore diameters of D = 8.5, 14.5, and 24.0 nm, anisotropic compression for nanorods (preferential compression along radial direction of the pores) occurred, and molecule solidification is suppressed at the lower temperature side compared with that under hydrostatic compression. For the smallest D = 6.5 nm, a hydrostatic contraction almost occurred, and the high adsorption capability enabled the detection of both the melting transition and change in crystal structure within the β phase, in addition to α – β and β – γ transitions.

中文翻译：

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静水收缩和各向异性收缩对氧分子纳米棒的影响

摘要 我们通过磁化测量研究了静水收缩和各向异性收缩对物理吸附到纳米孔（称为“O2 纳米棒”）的氧分子 (O2) 的分子凝聚的影响。O2 固化的多步骤伴随着温度降低而结构对称性降低，因此外部应力引起的结构变化会改变 O2 固化的稳定性。对于 D = 8.5、14.5 和 24.0 nm 的初始孔径，纳米棒发生各向异性压缩（沿孔的径向优先压缩），与静水压缩相比，分子凝固在较低温度侧受到抑制。对于最小的 D = 6.5 nm，几乎发生静水收缩，