Open AccessInsertion Compounds of 2H-TaS 2 ·NH 3
Author(s) -
S. Meyer,
Juana Vivó Acrivos,
T. H. Geballe
Publication year - 1975
Publication title -
proceedings of the national academy of sciences of the united states of america
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.011
H-Index - 771
eISSN - 1091-6490
pISSN - 0027-8424
DOI - 10.1073/pnas.72.2.464
Subject(s) - alkali metal , ammonia , potassium , inorganic chemistry , lithium (medication) , solubility , chemistry , electrolyte , homogeneous , intercalation (chemistry) , salt (chemistry) , sodium , metal , limiting , transition metal , organic chemistry , medicine , mechanical engineering , physics , electrode , engineering , thermodynamics , endocrinology , catalysis
A new method of intercalating metals into layer compounds has been developed using electrolytic generation from the salt solution in ammonia. The results suggest that metals that are soluble in ammonia will form a homogeneous metal-ammonia intercalate layer, NH3 ·Mx , whenx is less than the limiting solubility of M in NH3 . The superconducting transition temperature (Tc ) was found to increase as thec -axis expansion [2δ =c (TaS2 ·NH3 ·Mx ) -c (2H-TaS2 )] decreased when M = lithium, sodium, and potassium. Of all the alkali metals, potassium gave the most stable compounds and the highestTc , 4.7°K.