Synthesis and structural characterization of (Bi2O3)1�?����? (Y2O3)�? and (Bi2O3)1�?����? (Gd2O3)�? solid solutions

[摘要] Solid solution series, (Bi₂O₃)_{1â€�?�ð�?��?} (Y₂O$_3)_ð‘�? and (Bi₂O$_3)_{1â€�?�ð�?��?} (Gd₂O$_3)_ð‘�?, for ð‘�? = 0.10, 0.20, 0.30 and 0.40 were synthesized by standard ceramic technique. The structural phase characterization was carried out using X-ray powder diffraction technique. It was found that the solid solution containing 20â€�??40 mole% of Y₂O₃ had face-centred cubic structure. All samples of the solid solution series, (Bi₂O₃)_{1â€�?�ð�?��?} (Gd₂O₃)_ð‘�?, had rhombohedral single phase in the concentration range 0.10 â‰�? ð‘�?â‰�? 0.40. Lattice parameters of fcc phase of Y₂O₃ doped samples were calculated from the X-ray diffraction data. The lattice constant `𝑎â€�? gradually decreases with increasing content of dopant concentration (ð‘�?) for the Y₂O₃ doped system and obeys Vegard’s rule. The unit cell parameters for the (Bi₂O₃)_{1â€�?�ð�?��?} (Gd₂O₃)_ð‘�?doped samples showing rhombohedral phase were obtained on hexagonal setting.

[学科分类] 材料工程

[关键词] Fast ion conductors;fluorite structure;fuel cell materials.