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In the present work,a third form,the so-called HP-BiNbO4 synthesized at high pressure and high temperature is investigated with the in-situ angle-dispersive x-ray diffraction (ADXRD) measurements under high pressure.We explore the compression behavior and phase stability of HP-BiNbO4.The structure of HP-BiNbO4 is first determined.The x-ray diffraction data reveal that the structure HP-BiNbO4 is stable under pressures up to 24.1 GPa.The ADXRD data yield a bulk modulus Ko =185(7) GPa with a pressure derivative Ko’=2.9(0.8).Furthermore,the data are compared with those of other ABO4 compounds.The results show that the bulk modulus of HP-BiNbO4 (about 185 GPa) is slightly higher than that of tetragonal BiVO4 and significantly greater than those of the tungstates and molybdates.