Title of article :
Topotactic H+/Li+ ion exchange on La2/3−xLi3xTiO3: new metastable perovskite phases La2/3−xTiO3−3x(OH)3x and La2/3−xTiO3−3x/2 obtained by further dehydration
Author/Authors :
Bhuvanesh، نويسنده , , N.S.P and Bohnké، نويسنده , , O and Duroy، نويسنده , , H and Crosnier-Lopez، نويسنده , , M.P and Emery، نويسنده , , J and Fourquet، نويسنده , , J.L، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 1998
Abstract :
We have synthesized novel La2/3−xTiO3−3x(OH)3x (0.07 < x < 0.13) compounds by ion exchange of the lithium ions from La2/3−xLi3xTiO3 in dilute HNO3 at 60°C. The proton derivatives crystallize in tetragonal perovskite cells (a ≈ ap, c ≈ 2ap) similar to those of the parent oxides. Interestingly, the protonated oxides (characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), and 1H nuclear magnetic resonance (NMR) yield new metastable A-site- and oxygen-deficient perovskites La2/3−xTiO3−3x/2 at about 800°C.
Keywords :
B. Chemical synthesis , C. X-ray diffraction , D. Defects , A. Oxides , D. Ionic conductivity
Journal title :
Materials Research Bulletin
Journal title :
Materials Research Bulletin
