SPIE Proceedings [SPIE Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments 2017 - Wilga, Poland (Saturday 27 May 2017)] Photonics Applications in Astronomy, Communications, Industry, and High Energy Physics Experiments 2017 - Percolation threshold of granular metal-dielectric nanocomposites (FeCoZr) x (CaF 2 ) 1-x produced in atmosphere of argon and oxygen