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Superconducting Compositions Based on Intercalated MoS(2)

IP.com Disclosure Number: IPCOM000079489D
Original Publication Date: 1973-Jul-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Shafer, MW: AUTHOR [+3]

Abstract

Compositions having superconducting transition temperatures of 4-6 degrees K have been made by intercalating electropositive divalent metals with a nonsuperconducting compound, such as molybdenum disulfide (MoS(2)).

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Superconducting Compositions Based on Intercalated MoS(2)

Compositions having superconducting transition temperatures of 4-6 degrees K have been made by intercalating electropositive divalent metals with a nonsuperconducting compound, such as molybdenum disulfide (MoS(2)).

MoS(2) is a semiconductor with a layer type lattice. When it is intercalated with the divalent alkaline earths Ca, Sr, and Ba or the rare earth Yb, it becomes superconducting between a range of 4-6 degrees K. The compositions which have been observed to be superconductive are M(x)MoS(2), where M = Ca, Sr, Ba or Yb and x varies from 0.01 to 1.0. It has been found that the compound MoSe(2) is also superconducting when intercalated with Ca, Sr, Ba or Yb.

The MoS(2) is intercalated by placing it in a liquid NH(3) solution at -50 degrees C, in which the alkaline earths and Yb are dissolved. The divalent metals and electrons enter between the layers of the MoS(2) crystalline structure, along with several percent of NH(3). The resulting superconducting materials are candidates for low-temperature devices.

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