Ferroelectric Phase Transitions and Electroconducting Properties of Ceramic BIMEVOX Solid Solutions (Me = La, Zr)

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.…”

Solid solutions on the base of bismuth vanadate: Preparation, structure, phase transitions, dielectric and transport properties

“…Temperature plots of total conductivity reveal Arrhenius type behavior typical of ionic conductors [16][17][18][19][20][21][22]. As it is seen in Fig.…”

“…Temperature plots of dielectric permittivity ε(t) and dielectric loss tanδ(t) peaks, corresponding to the ferroelectric-paraelectric α-β Table 1 Temperatures of phase transitions in (Bi 1-y La y ) 4 phase transition, were observed only for the samples that belong to α-phase domain with x, y b 0.05 [19][20][21][22]. Temperature plots of total conductivity reveal Arrhenius type behavior typical of ionic conductors [16][17][18][19][20][21][22].…”

“…Poor thermodynamic stability of this oxide in reducing atmosphere comprises its main drawback and puts forward tasks to be solved. The modifications of the composition aimed to improve stability of oxides often lead to the stabilization of tetragonal phase at room temperature [11][12][13][14][15][16][17][18][19][20][21][22].…”