Abstract:
The NaVO
2F
2 compound was synthesized by hydrothermal method. The crystal structure of NaVO
2F
2 was analyzed by X-ray diffraction. In-situ Raman spectra of NaVO
2F
2 during the heating from 73 K to 573 K was obtained by Raman spectroscopy. The changes of characteristic peaks with temperature was analyzed and the phase transformation behavior was obtained. The results show that the obtained NaVO
2F
2 crystal was monoclinic at room temperature with space group
P21/c. During the heating process, the low-temperature first-order phase transformation, transformation from low-temperature phase to
P21/c phase and transformation from
P21/c phase to
P21/m phase occurred at the temperature point of 93, 233, 453 K, respectively. The results were in good agreement with those obtained by non-in-situ testing method, indicating that the in-situ Raman spectroscopy could be used to study the phase transformation behavior of NaVO
2F
2.