Revisiting Solid–Solid Phase Transitions in Sodium and Potassium Tetrafluoroborate for Thermal Energy Storage
Sumit Konar,
Gertruda Zieniute,
Elliot Lascelles
et al.
Abstract:In situ synchrotron powder X-ray diffraction (PXRD) study was conducted on sodium and potassium tetrafluoroborate (NaBF 4 and KBF 4 ) to elucidate structural changes across solid−solid phase transitions over multiple heating−cooling cycles. The phase transition temperatures from diffraction measurements are consistent with the differential scanning calorimetry data (∼240 °C for NaBF 4 and ∼290 °C for KBF 4 ). The crystal structure of the high-temperature (HT) NaBF 4 phase was determined from synchrotron PXRD d… Show more
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