Synthesis and structure–property relations in xCuO–(1 −x)Bi2O3 (0.5 ⩽x⩽ 0.9) (C1–C5: x= 0.5, 0.6, 0.7, 0.8, 0.9) glasses

Abstract Synthesis of the x CuO–(1 − x )Bi 2 O 3 (0.5 ⩽ x ⩽ 0.9) (C1–C5: x = 0.5, 0.6, 0.7, 0.8, 0.9) glasses was done via nitrate–citrate gel route. Glassy phase is ascertained by XRD studies. Magnetic susceptibility results in the range 4.2–400 K show weak paramagnetic nature with exchange integrals ∼0.024–0.13 eV in the glasses. The electron paramagnetic resonance (EPR) in the range 4.2–363 K shows g ≈ 2.0 and the trend of the g -matrix elements g || > g ⊥ > g e for the glasses C1–C5 at 4.2 K are due to the Cu 2+ (3d 9 ) paramagnetic site in the glasses which is in a tetragonally elongated octahedron [O 1/2 –CuO 4/2 –O 1/2 ] having D 4h symmetry. IR spectroscopic results show the presence of octahedron [BiO 6/2 ] 3− and [CuO 6/2 ] 4− units and pyramidal [BiO 2/2 O] − unit in the glasses.