Characteristics of Radiation Damage in Metal Nitride Compounds : Role of Structural Vacancy and Selective Displacement Damage

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Zirconium nitride (ZrN) has potential applications for inert matrix of nuclear fuel and transmutation target. This work aimed to clarify the characteristic features of microstructure evolution of ZrN subjected a variety of radiation, such as electrons, MeV order heavy ions, and swift heavy ions, which were chosen to simulate radiation environment of nuclear fuel/target materials. Transmission electron microscopy was utilized to investigate the radiation-induced microstructure evolution. Main results obtained in the present work are the role of selective displacement damage of anion sublattice, the superior resistance to ion track formation, and the development of nano-size grains due to the overlap of high density electronic excitation.