The refractive indices have been acquired using a spectroscopic ellipsometer (VASE, J.A. Woollam, U.S.A). The ellipsometric variables (Ψ and Δ) have been measured at three different angles of incidence (55°, 65° and 75°) over 360–2000 nm spectral region. The optical modeling has been conducted using the VASE32 (J.A. Woollam, U.S.A.) software package. The Raman spectrum was measured for TZNTEr001 sample by using a Renishaw in Via Raman Microscope (U.S.A) upon excitation at 786 nm laser excitation.