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A New Potassium Intercalation Compound of 3 R ‐Nb 1.1 S 2 and its Superconducting Hydrated Derivative Synthesized via Soft Chemistry Strategy
Author(s) -
Hao QiaoYan,
Zhu BaiChuan,
Wang DaKe,
Zeng SuYuan,
Gao Zhan,
Hu YiWei,
Wang Yan,
Wang YongKun,
Tang KaiBin
Publication year - 2016
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201600324
Subject(s) - intercalation (chemistry) , soft chemistry , superconductivity , derivative (finance) , chemistry , x ray photoelectron spectroscopy , doping , potassium , isotropic etching , crystallography , analytical chemistry (journal) , inorganic chemistry , etching (microfabrication) , materials science , physics , condensed matter physics , organic chemistry , nuclear magnetic resonance , optoelectronics , financial economics , economics , layer (electronics)
A new polymorph of potassium intercalation compound of 3 R ‐Nb 1.1 S 2 with chemical composition K 0.77 Nb 1.1 S 2 was synthesized for the first time by a facile solution‐phase method. Its structure was comprehensively characterized by powder XRD and high‐resolution TEM. Furthermore, its hydrated derivatives K x Nb 1.1 S 2 • yH 2 O were synthesized via soft chemistry strategy using etching agents of ethanol, water and an I 2 /CH 3 CN solution, respectively. Superconducting transition at 4.0 K was observed for the product with the doping content x=0.12. While superconductivity disappeared in products K x Nb 1.1 S 2 • yH 2 O (x=0.48 and 0.35) which displayed a metal‐to‐semiconductor transition at low temperature. In addition, the XPS analysis revealed an upward shift in the Fermi level in K 0.12 Nb 1.1 S 2 • yH 2 O compared with the host or K 0.77 Nb 1.1 S 2 .
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