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Monophasic and homogeneous Ni10Zr7 nanocrystalline alloy films weresuccessfully grown at room temperature by co-sputtering in an indigenouslydeveloped three-gun DC/RF magnetron sputtering unit. The films could beproduced with long-range crystallographic and chemical order in the alloy, thusovercoming the widely acknowledged inherent proclivity of the glass formingNi-Zr couple towards amorphization. Crystallinity of these alloys is adesirable feature with regard to improved efficacy in applications such ashydrogen storage, catalytic activity and nuclear reactor engineering, to name afew. Thermal stability of this crystalline phase, being vital for transition toviable applications, was investigated through systematic annealing of the alloyfilms at 473 K, 673 K and 923 K for various durations. While the films werestable at 473 K, the effect of annealing at 673 K was to create segregationinto nanocrystalline Ni (superparamagnetic) and amorphous Ni+Zr (non-magnetic)phases. Detailed analyses of the physical and magnetic structures before andafter annealing were performed through several techniques effectual inanalyzing stratified configurations and the findings were all consistent witheach other. Polarized neutron and X-ray reflectometry, grazing incidence x-raydiffraction, time-of-flight secondary ion mass spectroscopy and X-rayphotoelectron spectroscopy were used to gauge phase separation at nanometerlength scales. SQUID based magnetometry was used to investigate macroscopicmagnetic properties. Simulated annealing performed on this system usingmolecular dynamic calculations corroborated well with the experimental results.This study provides a thorough understanding of the creation and thermalevolution of a crystalline Ni-Zr alloy.

Thermal evolution of nanocrystalline co-sputtered Ni-Zr alloy films: Structural, magnetic and MD simulation studies