Nouveaux oxydes à structure en feuillets: Les titanates de potassium non-stoechiométriques Kx(MyTi2−y)O4

Effects of hydronium intercalation and cation substitution on the photocatalytic performance of layered titanium oxide

“…According to powder ND and XRD analyses, all the present titanates and their acid-treated derivatives display well-developed Bragg reflections, which are well indexed with lepidocrocite structure [7]. In contrast to negligible changes of the in-plane lattice parameters (a and c) of the layered titanates, the acid treatment induces remarkable increases of basal spacing from 8. respectively.…”

Lepidocrocite-type Layered Titanate Structures: New Lithium and Sodium Ion Intercalation Anode Materials

“…They comprise a large class of isomorphous compounds with composition A x Ti 2-y M y O 4 , where A= K, Rb, or Cs, and M represents a vacancy or Li, Mg, Co, Ni, Cu, Zn, or Mn. 15,16,17,18 Lepidocrocite titanates usually crystallize in an orthorhombic structure, consisting of two-dimensional layers of edge and corner sharing octahedra with the large alkali metal ions (A) located in the interlayers. These compensate for the negative charges that arise from the substitution of low valency metal ions or vacancies (M) for Ti 4+ .…”

Lepidocrocite-like ferrititanate nanosheets and their full exfoliation with quaternary ammonium compounds

“…LTs are commonly synthesized through solid state reaction between alkali metal carbonates, metal oxides and TiO 2 at high temperatures between 800 and 1300°C [20,[22][23][24], resulting in crystals with submicronic sizes along b crystallographic direction (perpendicular to the host layers) and lateral dimensions reaching several or even tens of microns. A newly proposed approach for synthesis of titanate nanotubes with corrugated, stepped, layered structure [25] and LTs nanosheets [26][27][28] through alkaline hydrothermal treatment of an abundant precursor such as raw mineral sand provides a straightforward route for preparation of LTs nanosheets consisting of only a few stacked layers and with lateral (planar) lengths not larger than a few tens to several hundreds of nanometers.…”