“…The crystal structure of tungsten bronzes [1,2] can be described as corner-sharing WO 6 octahedra, forming various kinds of tunnels where the metal atoms are located. Depending on the size, amount of the interstitial metal atom and synthesis temperature tungsten bronzes adopt four different structure types, namely, Perovskite Tungsten Bronzes (PTB) [3,4], Tetragonal Tungsten Bronzes (TTB) [5], Hexagonal Tungsten Bronzes (HTB) [6] and Intergrowth Tungsten Bronzes (ITB) [7]. Tungsten Bronze have interesting physical and chemical properties for which these materials are very demanding for modern technology [ 3 showing the degree of reduction of the bronzes depending on the value of x.…”