Composition and structure of acid leached LiMn{sub 2-y}Ti{sub y}O{sub 4} (0.2<=y<=1.5) spinels

Journal Article · Tue Dec 15 00:00:00 EST 2009 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2009.09.009· OSTI ID:21372413

Avdeev, Georgi ^[1]; Amarilla, Jose Manuel; Rojo, Jose Maria ^[2]; Petrov, Kostadin ^[1]

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1. Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia (Bulgaria)
2. Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Cientificas (CSIC), Sor Juana Ines de la Cruz no 3, Cantoblanco, 28049 Madrid (Spain)

Lithium manganese titanium spinels, LiMn{sub 2-y}Ti{sub y}O{sub 4}, (0.2<=y<=1.5) have been synthesized by solid-state reaction between TiO{sub 2} (anatase), Li{sub 2}CO{sub 3} and MnCO{sub 3}. Li{sup +} was leached from the powdered reaction products by treatment in excess of 0.2 N HCl at 85 deg. C for 6 h, under reflux. The elemental composition of the acidic solution and solid residues of leaching has been determined by complexometric titration, atomic absorption spectroscopy and X-ray fluorescence analysis. Powder X-ray diffraction was used for structural characterization of the crystalline fraction of the solid residues. It has been found that the amount of Li{sup +} leached from LiMn{sub 2-y}Ti{sub y}O{sub 4} decreases monotonically with increasing y in the interval 0.2<=y<=1.0 and abruptly drops to negligibly small values for y>1.0. The content of Mn and Li in the liquid phase and of Mn and Ti in the solid (amorphous plus crystalline) residue, were related to the composition and cation distribution in the pristine compounds. A new formal chemical equation describing the process of leaching and a mechanism of the structural transformation undergone by the initial solids as a result of Li{sup +} removal has been proposed. - Graphical abstract: Schematic representation of the acid leaching of LiMn{sub 2-y}Ti{sub y}O{sub 4} (0.2<=y<=1.0).

• OSTI ID: 21372413
• Journal Information: Journal of Solid State Chemistry, Vol. 182, Issue 12; Other Information: DOI: 10.1016/j.jssc.2009.09.009; PII: S0022-4596(09)00444-7; Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ABSORPTION SPECTROSCOPY
DOPED MATERIALS
HYDROCHLORIC ACID
LEACHING
LITHIUM CARBONATES
LITHIUM IONS
LITHIUM OXIDES
MANGANESE CARBONATES
MANGANESE OXIDES
SPINELS
TITANIUM OXIDES
TITRATION
X-RAY DIFFRACTION
X-RAY FLUORESCENCE ANALYSIS
ALKALI METAL COMPOUNDS
CARBON COMPOUNDS
CARBONATES
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL ANALYSIS
CHLORINE COMPOUNDS
COHERENT SCATTERING
DIFFRACTION
DISSOLUTION
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
INORGANIC COMPOUNDS
IONS
LITHIUM COMPOUNDS
MANGANESE COMPOUNDS
MATERIALS
MINERALS
NONDESTRUCTIVE ANALYSIS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
QUANTITATIVE CHEMICAL ANALYSIS
SCATTERING
SEPARATION PROCESSES
SPECTROSCOPY
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
VOLUMETRIC ANALYSIS
X-RAY EMISSION ANALYSIS