Crystal Structure and Magnetic Properties of a New Oxyselenide of Gadolinium and Titanium: Gd4TiSe4O4

Crystal structures of two new oxysulfides La5Ti2MS5O7 (M=Cu, Ag): evidence of anionic segregation

“…Fig. 5b shows the OBVR of RE and Ti calculated for the four known structures in the RE-Ti-Se-O system [19][20][21]. In this case, there is no obvious trend concerning the anionic segregation with sometimes D(OBVR) negative or positive.…”

“…Fig. 5a [20], (c) La 4 Ti 2 Se 5 O 4 [21], and (d) La 6 Ti 3 Se 9 O 5 [21]. this figure, the straight line indicates the theoretical case in which the valence exchange with oxygen would correspond to the anionic ratio O/(O+S).…”

Flux Synthesis, Crystal Structures, and Magnetism of the Series La2n+2MnSen+2O2n+2 (n = 0–2)

“…However, these octahedra are connected by two edge-sharing OLa 3 Mn-as well as either two or four additional OLa 4 -tetrahedra along the a-axis, respectively. The framework of four units wide, edge-sharing tetrahedra forming infinite ribbons was already observed in RE 4 TiSe 4 O 4 [13,14] and oP/oA-La 2 TSe 2 O 2 (T = Fe, Mn) [8]. Frameworks with six units wide tetrahedra are, to our best knowledge, unknown so far.…”

“…Beside oxyselenides with the general chemical composition above, numerous other rare-earth oxyselenides are known, for example RE 4 TiSe 4 O 4 (RE = Sm, Gd, Tb, Dy, Ho, Er, Y) [13,14] …”

Crystal structure and electrical properties of the mixed valent titanium oxysulfide Sm2Ti2S2O4.5

“…and/or interesting structural features (anionic segregation [3], layered structures [4,5]). Among all systems, the rare-earth titanium oxychalcogenide system has been the most studied and several compounds have been characterized, as exemplified for instance by La 8 Ti 10 [9]. In most cases, titanium adopts the +IV oxidation state, but it was also found with the +III oxidation state or in a mixed valence state.…”