Abstract：Due to the important applications of ferroelectric materials in the field of scientific research, the design and mechanism of functional ferroelectric materials have received great attention. The properties of materials cannot be separated from the study of structures. In order to understand the structure and phase behavior of a typical ferroelectric material-NH4HSO4, the in-situ high Pressure Raman measurement of NH4HSO4 up to 17 GPa is performed. With the increase of pressure, most of Raman bands shifted to higher wave number region. And the Intensities of two Raman bands (located at 1 018 and 3 183 cm-1) changed greatly with pressure, suggests that the electron density of sulfate and ammonium ion is redistributed. Based on the relationship between the frequency shift and pressure curves, it is found that there are two first-order phase transitions at about 6 GPa and 10.5 GPa, respectively. According to the changes tendency of SO stretching vibration band under compression, it is found that the hydrogen bond at different phases has the opposite change tendency. It provides a new strategy for investigation of AHSO4 ferroelectric materials under pressure.
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