The electrospinning technique for the synthesis of magnesium borate fibers was investigated. A solution of alkoxide precursors and polyvinyl-pyrrolidone was used Fibers with average diameters in the 500-700 nm range were detected in the green fiber mats. Heat treatments at 900°C in air formed crystalline and dense fibers with slightly smaller dimensions (300-500 nm). The main phase detected by XRD analysis was Mg_2B_2O_5, while Mg_3B_2O_6, was also present as a secondary phase. The heat treatment at 800°C in reducing atmosphere also delivered thin fibers with higher specific surface area: in this case part of the boron from the precursors was retained in a glassy phase, hence the main compound detected by X-ray diffraction was Mg_3B_2O_6.
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