Preparation and Superconductivity of New Stage and Polytypic Phases in Potassium-Intercalated Zirconium Nitride Chloride (K x ZrNCl)

Potassium was intercalated into β-ZrNCl layer structured crystals using a K-naphthalene solution in tetrahydrofuran (THF), and a direct reaction with potassium metal. New polytypic and intermediate-stage intercalation compounds have been obtained with different amounts of potassium and the co-interc...

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Bibliographic Details
Published in:Chemistry of materials 2011-03, Vol.23 (6), p.1558-1563
Main Authors: Zheng, Zhanfeng, Yamanaka, Shoji
Format: Article
Language:English
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Summary:Potassium was intercalated into β-ZrNCl layer structured crystals using a K-naphthalene solution in tetrahydrofuran (THF), and a direct reaction with potassium metal. New polytypic and intermediate-stage intercalation compounds have been obtained with different amounts of potassium and the co-intercalation of THF. The structure and the formation mechanism have been discussed. The intercalation compounds showed superconductivity with the transition temperatures of 11.5−15.0 K. The higher critical temperature (T c) values of the lower K-doped and co-intercalated phases can be interpreted in terms of the unconventional superconductivity of the present system.
ISSN:0897-4756
1520-5002
DOI:10.1021/cm103368g