Dielectric loss caused by oxygen vacancies in titania ceramics

Structural, optical and photoconductivity of Sn and Mn doped TiO2 nanoparticles

“…The density of the samples vary very closely while the specific surface area increases with increase in Sn and Mn content but it decreases for Mn content 0.04 and 0.06 wt% (Tables 1 and 2). The similar ionic radius of Ti 4+ (0.605 Å) [17] and Sn 4+ (0.690 Å) [18] allow easy substitution of Ti 4+ by Sn 4+ in TiO 2 lattice. It is observed that the value of FWHM increases with the increase in doping percentage which may leads to the decrease in crystallinity and crystallite size.…”

Ge4+ doped TiO2 for stoichiometric degradation of warfare agents

“…Mo, W, Nb, Ta) atoms to TiO 2 structure enables added or changed certain properties of TiO 2 such as increment surface area and porosity, changes in particles morphology [17] and phase composition [18] or structural defects in crystal lattice [19]. The Ge 4+ ionic radius 0.054 nm [20] is smaller then ionic radius of Ti 4+ (0.0605 nm) [21] and germanium can be easily substituted for Ti 4+ in to TiO 2 lattice. The Ge 4+ doping TiO 2 can positively influence properties TiO 2 for stoichiometric or photocatalytic applications.…”

New low loss A9B9O31 (A = La; B = Ti, Mg, Sc, Fe, Al, Ga) ceramics for microwave applications

“…4). A possible reason for this observation may be the mixed valence of Fe (II, III) [21] at high temperatures (>1500 C) which leads to the so called 'coring' effect [22] in which the center of the sample exhibits reduction due to the lower effective P(O 2 ). The temperature coefficient of resonance frequency depends on the temperature coefficient of dielectric constant (ΤCε r ).…”