Synthesis and structural characterization of (Bi2O3)1−x (Y2O3)x and (Bi2O3)1−x (Gd2O3)x solid solutions

Abstract

Solid solution series, (Bi 2 O 3) 1-x (Y 2 O 3) x and (Bi 2 O 3) 1-x (Gd 2 O 3) x , for x = 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 20-40 mole% of Y 2 O 3 had face-centred cubic structure. All samples of the solid solution series, (Bi 2 O 3) 1-x (Gd 2 O 3) x , had rhombohedral single phase in the concentration range 0⋅ ⋅10 ≤ ≤ x ≤ ≤ 0⋅ ⋅40. Lattice parameters of fcc phase of Y 2 O 3 doped samples were calculated from the X-ray diffraction data. The lattice constant 'a' gradually decreases with increasing content of dopant concentration (x) for the Y 2 O 3 doped system and obeys Vegard's rule. The unit cell parameters for the (Bi 2 O 3) 1-x (Gd 2 O 3) x doped samples showing rhombohedral phase were obtained on hexagonal setting.

Photoactive Brownmillerite Multiferroic KBiFe2O5 and Its Potential Application in Sunlight-Driven Photocatalysis

“…Bi 2 O 3 exists in six different phases such as monoclinic (α-Bi 2 O 3 ), body-centered cubic (γ-Bi 2 O 3 ), face-centered cubic (fcc) (δ-Bi 2 O 3 ), tetragonal (β-Bi 2 O 3 ), triclinic (ω-Bi 2 O 3 ), and orthorhombic (ε-Bi 2 O 3 ). 27−33 Among them, α-phase is the most stable at room temperature, whereas the other five forms are unstable crystal modifications formed at high temperatures. Hence, if the synthesis temperature goes beyond the phase-transition temperature (729 °C) of Bi 2 O 3 , it transforms into δ-Bi 2 O 3 phase, which is stable at high temperature.…”

Structural and electrical study of CeIV-substituted bismuth vanadate

“…However, the thermodynamic instability and volatilization of Bi 2 O 3 at moderate temperatures limit its application as electrolyte for high-temperature SOFCs [2,3]. Thus, many attempts have been made for stabilization of d-Bi 2 O 3 phase down to temperatures below 730 1C via the formation of numerous series of solid solutions obtained by doping with one or several aliovalent cations [4][5][6][7]. In recent years, many researches have paid attention to materials with high oxide ion conductivity at lower temperatures.…”

Current vs. voltage behavior of Hebb-Wagner ion-blocking cell through compound (Bi1.46Y0.54O3) decomposition and decomposition kinetics

“…If this is the case, there must have been a decrease in the lattice parameter of YDB because the reduced YDB or the solid solution (0.73-δ) Bi with the virgin YDB, 0.73Bi 2 O 3 + 0.27Y 2 O 3 , and the lattice parameter of the solution decreases with Y 2 O 3 content [17]. It has turned out to be true indeed.…”