THE KINETIC-ENERGY OF LI-7 ABOVE AND BELOW THE MARTENSITIC-TRANSFORMATION

被引：24

作者：

EVANS, AC ^{[1
]}

MAYERS, J ^{[1
]}

TIMMS, DN ^{[1
]}

机构：

[1] UNIV PORTSMOUTH,DEPT PHYS,PORTSMOUTH PO1 2DZ,ENGLAND

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1994年 / 6卷 / 22期

关键词：

D O I：

10.1088/0953-8984/6/22/018

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The atomic momentum distribution of lithium-7 in natural Li has been determined as a function of temperature from 20 to 300 K. The experiments were undertaken within the impulse approximation using the electronvolt spectrometer at ISIS. Final state effects were present above the statistical accuracy of our data and were accounted for by symmetrizing the neutron Compton profiles. The mean atomic kinetic energy of the Li nucleus was obtained directly from our measurements and was found to be approximately 10% higher than that predicted by a harmonic model incorporating a density of states derived from previous phonon measurements. A fit of the data to the Debye model gave a Debye temperature of 419 +/- 3 K.

引用

页码：4197 / 4212

页数：16

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