Phase transitions in the BIZRVOX system

Phase Transitions and Transport Properties of the Bismuth Vanadate-Based (Bi,La)4(V,Zr)2O11-zCeramics

“…In compositions with higher y values, parameter a increases slightly, parameter b decreases slightly, while parameters c and V do not change with increasing concentration of La 3+ cations. These results are consistent with the data obtained earlier for Zror La-doped bismuth vanadate solid solutions [6,9,10,[13][14][15][16][17][18][19].…”

“…The parent bismuth vanadate compound undergoes phase transitions between α and β polymorphous modifications at approximately 700 K and between β-and tetragonal γ-phase at approximately 850 K [3][4][5]. Composition modifications by substitution of different valency cations for V 5+ and/or Bi 3+ cations were aimed at and succeeded in the stabilization of the tetragonal structure phase at the room temperature [6][7][8][9][10][11][12][13][14][15][16][17][18][19]. However, the poor thermodynamic stability of these oxides in reducing atmospheres hinders their real applications and comprises the main task to be solved.…”

Structural, thermal, and electrical properties of (100−x) ZrO2 (x) Bi2O3 compound

“…The conductivity values for all the samples are calculated and summarized in Table 2. The conductivity of samples x015 and x020 comes out to be almost of similar order as reported earlier [7]. However, the conductivity decreases slightly in sample x020.…”

“…Similarly, pure m-Bi 2 O 3 shows better ionic conductivity than YSZ in lower temperature region, but the higher-conducting δ-Bi 2 O 3 phase is stable in a narrow range of temperature (730-825°C). The stability of the δ-Bi 2 O 3 phase at lower temperatures can be achieved by substituting Bi 3+ with different mono to pentavalent cations [6][7][8]. For stabilization, the stabilizing cations must have larger ionic radii, lower charge, and higher ionicity [9].…”

Study of phase transition of TiO2–CaO system

“…These results are in good agreement with those obtained from DSC measurements, although there is a slight difference in the phase transition temperatures. This difference can be attributed to the different timescales of the two techniques [33,34] as the heating rates of conductivity and DSC measurements were controlled at 1 and 10°C/min, respectively. Figure 6 shows the rise in isothermal conductivity as the level of substitution decreases at room temperature at 10 kHz.…”