Gelest, Inc. offers a wide range of metal alkoxides and diketonates for use in forming metal oxide superconductors

Alkoxide precursors can be used for making mixed-metal superconductors by sol-gel routes. Volatile precursors are used in MOCVD preparations of thin film superconductors. Exciting developments in the field of high temperature superconductors have lead to many new materials being investigated.

The key structural unit in high critical temperature (Tc) superconductors is the CuO2 plane. This two-dimensional plane consists of divalent copper and oxygen ions. There is a general consensus that this plane plays an essential role in the formation of the Copper pairs, and therefore, in the appearance of superconductivity itself. Divalent copper ion is a d9 ion because of its strong electron-electron interaction, and the ninth electron tends to be localized on each copper site, resulting in semiconducting or insulating behavior in the CuO2 plane, and so its ground state is not superconducting but is antiferromagnetic. Superconductivity appears if this plane is doped with holes (or electrons), and the formal valence of the copper ion deviates from 2+. There is an optimum doping level for holes (electrons). A high Tc superconductor should, therefore, have at least two structural features:-(i) a layered structure based on the CuO2 plane, and (ii) in addition to the CuO2 plane, a certain structural block, called a charge reservoir, where a proper number of carriers are created and doped into the CuO2 plane. A simple way to dope carriers into the CuO2 plane in the infinite-layer compound is through heterovalent metal substitution. For instance, an n-type superconductor with electrons as carriers is formed by partial replacement using a trivalent metal such as lanthanum, barium, strontium or yttrium.

Metal Oxide Precursors

Listed below are some popular examples of metal oxide precursors, and Gelest, Inc. offers many other precursors for the metal oxides used in superconductors.

AKB121

BARIUM ISOPROPOXIDE, 20% in isopropanol

AKB144

BARIUM(II) 2,2,6,6-TETRAMETHYL-3,5-HEPTANEDIONATE, hydrate

CXBA080

BARIUM TRIFLUOROACETATE

CXBI040

BISMUTH 2-ETHYLHEXANOATE, 80-85% in mineral spirits

AKC163

CALCIUM HEXAFLUORO-2,4-PENTANEDIONATE

AKC172

CALCIUM 2,2,6,6-TETRAMETHYL-3,5-HEPTANEDIONATE

AKC253

COPPER(II) HEXAFLUORO-2,4-PENTANEDIONATE, dihydrate

AKC262

COPPER(II) 2,2,6,6-TETRAMETHYL-3,5-HEPTANEDIONATE

AKC248

COPPER(II) DIMETHYLAMINOETHOXIDE

AKL430

LANTHANUM 2,4-PENTANEDIONATE, hydrate

AKS793

STRONTIUM 1-METHOXY-2-PROPOXIDE, 18-20% in methoxypropanol

AKY927

YTTRIUM METHOXYETHOXIDE, 15-18% in methoxyethanol

AKY932

YTTRIUM 2,2,6,6-TETRAMETHYL-3,5-HEPTANEDIONATE

Double Metal Alkoxides

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