Investigation of structural, spectroscopic, dielectric, magnetic, and in vitro biocompatibility properties of Sr/Ni co-doped hydroxyapatites

Structural, optical and photocatalytic properties of cerium doped Ba2TiMoO6 double perovskite

“…As we found in our previous studies, although Ba2TiMoO6 crystallized in the monoclinic crystal system [27], Ce-Ba2TiMoO6 crystallized in the tetragonal crystal system. Ce 3+ dopped to pure structure directly changed the crystal system of the structure.…”

“…It has been reported that the addition large ionic radius cation can induce an enlargement of the crystal lattice due to steric effects [48][49][50][51]. This explains why the unit cell volume of cb1 is greater than cbo [27]. This situation stated in the literature also explains why the unit cell volume of cb7 is smaller than cb1 with reversible thinking.…”

“…The crystal system of the pure Ba2TiMoO6 in our previous investigation was determined monoclinic and the space group P21/c [27]. When Ce doped at x=1,3.5 and 7% ratios to the pure Ba2TiMoO6 structure, it was determined that the crystal systems of all cb1, cb3, cb5 and cb7 compounds were tetragonel by using the FullProf software package and Rietveld structure refinement.…”

“…The ionic radius of Ce 3+ and Ce 4+ are 1.143 and 0.970 Å, respectively. Doping an atom with a large ionic radius into Ba2TiMoO6 (cb0) changed the atomic bond lengths and bond angles [27]. This change in the bond lengths changed the molecular packing in the unit cell, the number of molecules in the unit cell Z=3, and consequently the crystal system.…”

“…The perovskite double oxides known since 1960s of chemical formula A2BB'O6 [22]. Its unit cell consists of two merged perovskite oxide ABO3 and has a variety of crystalline structures at room temperature, e. g. cubic (Fm3 ̅ m, Fm3m), tetragonal (I4/m, P4/mmm, P4mm), and monoclinic (P2/m, P21/n, P21/c) as the Ba2(Fe,Ca,Mn,Zn,Ti,Cu)(Fe,Mo,Ti)O6 [23][24][25][26][27][28][29][30][31].…”