Strain and vacancy cluster behavior of vanadium and tungsten-doped Ba[Zr0.10Ti0.90]O3 ceramics

Abstract

Strain and vacancy clusters behavior of polycrystalline vanadium (V) and tungsten (W)-doped Ba[Zr0.10Ti0.90]O3, (BZT:2%V) and (BZT:2%W) ceramics obtained by the mixed oxide method was evaluated. Substitution of V and W reduces the distortion of octahedral clusters, decreasing the Raman modes. Electron paramagnetic resonance data indicate that the addition of dopants leads to defects and symmetry changes in the BZT lattice. Remnant polarization and coercive field are affected by V and W substitution due the electron-relaxation mode. The unipolar strain E curves as a function of electric field reach its maximum value for BZT:2%V and BZT:2%W ceramics.

Optical properties of porous YVO4:Ln (Ln=Dy3+ and Tm3+) nanoplates obtained by the chemical co-precipitation method

“…It was found that the environment of the ethylene glycol solution considerably influenced the shape formation of the YVO 4 :Ln crystals. latter to the f-f transitions within Dy 3+ 4 F 9 configuration [19,31]. The absorption of [VO 6 ] is ascribed to a charge transfer from the oxygen ligands (O 2− ) to the central vanadium atom (V 5+ ).…”

Dielectric properties, microstructure and diffuse transition of Ni-doped Ba(Zr0.2Ti0.8)O3 ceramics

“…The effect of doping on microstructure and dielectric properties of BZT materials has been extensively studied to further improve their performance [21][22][23][24][25][26][27][28][29][30][31]. It has been indicated that the diffuseness of the phase transition and the degree of ferroelectric relaxor behavior were enhanced and the tunability was suppressed as the x value of (Ba 1−x Ln x )Zr 0.2 Ti 0.8−x/4 O 3 (x = 0.005-0.04, Ln = La, Sm, Eu, Dy, Y) ceramics increased [21].…”

Structure and optical properties of [Ba1–xY2x/3](Zr0.25Ti0.75)O3 powders

“…In fact, the researches with this perovskite [16e18] have been mainly focused on the dielectric properties as well as on the phase transition from ferroelectric to relaxor. In this case, in order to improve the electrical properties, the BZT ceramics have been doped with different lanthanides, semi-metal and alkaline-earth metals, such as: niobium [19], boron [20,21], lithium [17], yttrium [22], copper [23], vanadium [24], tungsten [25], manganese [26], nickel [27], aluminium [28], bismuth [23,29], lanthanum [30], cerium [31], samariumeeuropiumedysprosium [32], erbium [33] and ytterbium [34].…”