Equation of state of NiO studied by shock compression

Shock compression experiments on NiO single crystals, grown by the Verneuil method, have been carried out up to 147 GPa using both propellant and two- stage light-gas guns. The shock states, observed by streak photography, wer e analyzed by the free-surface approximation and impedance match solution. The determined pressure-volume relation showed no discontinuous volume decr ease, indicating that NiO remains with the NaCl-type structure up to 147 GP a. The shock compression curve yields the isothermal compression curve desc ribed by a bulk modulus K = 191GPa and its pressure derivative K-1 = 3.9 (K -11 = -0.03 GPa(-1)). (C) 1999 Elsevier Science Ltd. All rights reserved.