A new synthetic pathway for alkaline-earth hexaborides has been developed. This method involves a solid state metathesis between an alkaline-earth (Ca, Ba, Sr) salt and MgB2, which can be performed at relatively low temperatures, without any catalyst and with no hazardous side products. The proposed protocol shows a good reproducibility and a much lower energy consumption (and, consequently, lower costs) than any known traditional synthesis. In view of the possibility of using alkaline-earth hexaborides as overdopants in MgB2 superconductors in order to enhance its transport properties in magnetic field, several MgB2 + MB6 bulk composites were obtained with the “Reactive Liquid Mg Infiltration” (Mg-RLI) technique, and characterized by X-ray Powder Diffraction (XRPD) and Scanning Electron Microscopy (SEM) methods.
Synthesis of alkaline-earth hexaborides, MB6 (M = Ca, Ba, Sr), by a solid state metathesis (SSM) reaction
APREA, ALESSIA;MASPERO, ANGELO;
2012-01-01
Abstract
A new synthetic pathway for alkaline-earth hexaborides has been developed. This method involves a solid state metathesis between an alkaline-earth (Ca, Ba, Sr) salt and MgB2, which can be performed at relatively low temperatures, without any catalyst and with no hazardous side products. The proposed protocol shows a good reproducibility and a much lower energy consumption (and, consequently, lower costs) than any known traditional synthesis. In view of the possibility of using alkaline-earth hexaborides as overdopants in MgB2 superconductors in order to enhance its transport properties in magnetic field, several MgB2 + MB6 bulk composites were obtained with the “Reactive Liquid Mg Infiltration” (Mg-RLI) technique, and characterized by X-ray Powder Diffraction (XRPD) and Scanning Electron Microscopy (SEM) methods.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
