LOW-FIELD EPR STUDY OF THE METAL-NON-METAL TRANSITION IN SODIUM-AMMONIA SOLUTIONS

O. Terakado, T. Kamiyama, Y. Nakamura
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引用次数: 3

Abstract

Solutions of alkali metals in liquid ammonia show a metal–non-metal (MNM) transition at about 4 mol% metal (MPM). In this paper, we present the results of electron paramagnetic resonance (EPR) studies of sodium–ammonia solutions at 200 MHz as a function of temperature and metal concentration. It has been suggested that the transverse spin relaxation rate consists of two contributions: a hyperfine interaction with 14N nuclei, which is dominant at lower metal concentrations, and a spin–orbit interaction, dominant at higher metal concentrations. The cross-over occurs around 1.5 MPM, a little below the bulk MNM transition point of 4 MPM. From the integrated intensity data of EPR we have examined the spin-pairing equilibrium of excess electrons in the solutions.
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钠-氨溶液中金属-非金属过渡的低场epr研究
碱金属在液氨中的溶液在约4 mol%金属(MPM)时发生金属-非金属(MNM)转变。在本文中,我们提出了电子顺磁共振(EPR)研究结果钠-氨溶液在200兆赫的温度和金属浓度的函数。研究表明,横向自旋弛豫率由两个因素组成:与14N核的超精细相互作用,在低金属浓度下占主导地位;自旋轨道相互作用,在高金属浓度下占主导地位。交叉发生在1.5 MPM左右,略低于4 MPM的体积MNM过渡点。从EPR的积分强度数据出发,考察了溶液中多余电子的自旋对平衡。
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