New Electron-doping Method for Layer-Structured Crystals of β-MNCl (M=Zr, Hf) and Their Properties

Abstract

Layer-structured crystals of /?-MNCl (M = Zr, Hf) have been electron-doped successfully by reactions with alkali metal azides RN3 (R = Li, Na, K, Rb), the amounts of which were controlled with the molar ratios of azides to jfi-MNCl. The prepared compounds show superconductivity with transition temperatures ( Tm) at 13.5 K for /3- ZrNCl and 23.5 K for /3-HfNCl. The results of the experiments showed that the sample obtained from the reaction with the molar ratio of x = ?(NaN3)/ft(/?-ZrNCl) =0.3 was bulk superconductor. The mechanisms of reactions and electron-doping were studied tentatively by the results of XRD, TEM and SQUID measurements. The stability of the obtained superconductors in air was also investigated.

Key words: AZIDE, DOPE, SUPERCONDUCTORS, LITHIUM COMPOUNDS, SODIUM COMPOUNDS, POTASSIUM COMPOUNDS, RUBIDIUM COMPOUNDS, ZIRCONIUM COMPOUNDS, HAFNIUM COMPOUNDS, XRD

Cite this article

Zhu Liping;Ye Zhizhen. New Electron-doping Method for Layer-Structured Crystals of β-MNCl (M=Zr, Hf) and Their Properties[J]. Acta Chimica Sinica, 2003, 61(11): 1844-1848.

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层状晶体β-MNCl(M=Zr,Hf)的电子掺杂新方法及其性质研究