6533b820fe1ef96bd1279893
RESEARCH PRODUCT
Fast synthesis of single-phased 110 K bismuth superconductor by freeze-drying of acetic precursors. Kinetic role of calcium and copper oxides
Rafael IbáñezD. BeltranV. PrimoMaria J. SanchisAurelio BeltránFernando Sapiñasubject
SuperconductivityMaterials scienceReaction stepInorganic chemistrychemistry.chemical_elementSinteringGeneral ChemistryCalciumCondensed Matter PhysicsCopperBismuthFreeze-dryingchemistryPhase (matter)General Materials Sciencedescription
Abstract Although the usefulness of solution procedures to improve the synthesis of bismuth HTSC has been argued, an adequate control of the procedural variables has allowed us to isolate the 110 K phase as the only superconducting phase after such a short sintering time as 22 h. The precursors used have been freeze-dried powders resulting from acetic solutions containing excess Ca and Cu. TGA-DTA and XRD experiments have been performed to follow the subsequent solid-state reaction processes. The initial formation of a mixed bismuth-lead oxoacetate, as intermediate to (Bi 1− y Pb y ) 2 CuO 4 , and the presence of an excess of Ca 2 CuO 3 in the last reaction step are two of the main factors driving the fast synthesis of the 110 K phase.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1993-09-01 | Solid State Ionics |