Under these conditions, they have a yellow colour, as the atoms in the crystal do not form a perovskite structure
. For the crystals to absorb sunlight efficiently and turn it into electricity, they should be in a black, perovskite state - and stay that way.
PT has a perovskite structure
of the tetragonal type, space group P4/mmm (crystallographic report 06-0452), while ST has a cubic structure with a Pm-3m space group (crystallographic report 035-0734).
Cobaltites REBa[Co.sub.2][O.sub.6-[delta]], where REis a rare earth metal, with the double perovskite structure
have attracted great attention in the past decade due to their unique properties such as high oxide ion and electronic conductivity as well as very promising activity as cathodes in IT SOFCs [1-5].
Kudo, "Water splitting into [H.sub.2] and [O.sub.2] over niobate and titanate photocatalysts with (111) planetype layered perovskite structure
," Energy & Environmental Science, vol.
While in the [Ba.sub.1-x]CFZY perovskite structure
Figure 1(d)), the A site is occupied by 12-fold coordinated [Ba.sup.2+] cations with a larger ionic radius, while the B site is occupied by smaller Co/Fe/Zr/ Y ions in 6-fold coordination to the oxygen anions (that is to say Co/Fe/Zr/Y ions are at the center of the oxygen octahedron).
All the main diffraction peaks can be readily assigned to the cubic perovskite structure
of SrTi[O.sub.3] (JCPDS 35-0734), demonstrating that the perovskite structure
is still well maintained after [K.sup.+] substitution.
types are an ideal candidate material for nonlinear optical applications; these include PbTi[O.sub.3], Pb(Zr,Ti)[O.sub.3], Pb([Fe.sub.1/2][Nb.sub.1/2])[O.sub.3], Pb([Fe.sub.0.5][Ta.sub.0.5]) [O.sub.3], Pb([Fe.sub.1-x][Nb.sub.x])[O.sub.3] and [Ni.sub.0.3]s[Zn.sub.0.65][Fe.sub.2][O.sub.4], Pb([Mg.sub.1/3][Nb.sub.2/3])[O.sub.3] (PMN), Pb([Sc.sub.1/2][Ta.sub.1/2])[O.sub.3] (PST), and [Pb.sub.1-x][L.sub.ax][([Zr.sub.1-y][Ti.sub.y]).sub.1-x/4] (PLZT) [3, 10, 14, 25].
Also in Figure 2(b), the XRD diffraction peaks around 14.21[degrees], 28.51[degrees], and 31.88[degrees] are assigned to the (110), (220), and (310) lattice planes, respectively, of the tetragonal perovskite structure
, which indicates the formation of perovskite film.
Lanthanum aluminate perovskite structure
, it has received considerable attention as a catalytic material, very little disagreement barium and strontium lattice constant temperature gives us a superconductor.
The films show pure phase rhombohedrally distorted perovskite structure
In this research, a single and consistent method was proposed for the production of ceramic nanocrystals based on titanate with perovskite structure
and free from carbonate contaminations.