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In this study, an in situ X-ray diffraction study of α-ScOOH, scandium oxyhydroxide with a diaspore-type structure, was conducted at a pressure and temperature of up to 4.12 GPa and 700 K, respectively, to determine the pressure-volume-temperature ( P - V - T ) equation of state (EoS). Using a least-squares fit of the second-order Birch–Murnaghan EoS to the  P - V - T  data, the EoS parameters of α-ScOOH were determined as bulk modulus  K T0  = 101(1) GPa, (∂ K T/∂ T )P = −0.009(5) GPa K −1 , and thermal expansion coefficient at zero pressure α = 3.12(6) 10 −5  K −1 . α-ScOOH exhibits anisotropic compression and thermal expansion behaviors, which are consistent with those of previous studies on diaspore-type oxyhydroxides. α-ScOOH is more compressible than other diaspore-type oxyhydroxides, and the product of the bulk modulus and volume is approximately constant among diaspore-type M 3 +  OOH (M = Al, Sc, and Fe).

P - V - T equation of state of α-ScOOH.