Inelastic neutron scattering from confined molecular oxygen

被引：10

作者：

Kilburn, Duncan ^{[1
]}

Sokol, Paul E. ^{[1
]}

Brown, Craig M. ^{[2
]}

机构：

[1] Indiana Univ, Cyclotron Facil, Bloomington, IN 47404 USA

[2] Natl Inst Stand & Technol, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 21期

基金：

美国国家科学基金会;

关键词：

crystal structure; heat of transformation; magnetic moments; mixing; neutron diffraction; oxygen; solid-state phase transformations;

D O I：

10.1103/PhysRevB.78.214304

中图分类号：

T [工业技术];

学科分类号：

08 [工学];

摘要：

Inelastic neutron-scattering measurements were carried out on condensed bulk and confined molecular oxygen. The phase transitions of the oxygen confined in cylindrical pores with diameter of approximate to 94 A are suppressed below their bulk temperatures or in the case of the lowest-temperature transition to the alpha phase are suppressed entirely. This last observation is possibly due to the low latent heat of transition for this transition. Both elastic and inelastic neutron-scattering data indicate a mixing of oxygen crystal phases upon confinement. Magnetic ordering fluctuations in the beta phase are found to have similar energy-dependent profiles for confined and bulk excitations showing that the magnetic correlation function decay is unaffected by the finite crystal size in confinement.

引用

页数：9

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