The low temperature synthesis of metal oxides by novel hydrazine method

Rane, K. S.; Uskaikar, Harsha P.; Pednekar, Rajesh; Mhalsikar, R.G.

doi:10.1007/s10973-007-8515-8

Cited by 16 publications

(2 citation statements)

References 30 publications

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“…Anhydrous alkali metal oxalates M 2 C 2 O 4 form an interesting group of compounds with very similar layered crystal structures and well-defined oxalate anions as an independent entity surrounded by metallic cations, decomposing thermally-unlike transition metal oxalates-via two step process with respective carbonate as transition product [1][2][3][4][5][6][7][8][9][10][11][12]:…”

Section: Introductionmentioning

confidence: 99%

Theoretical studies of electronic structure and structural properties of anhydrous alkali metal oxalates

Koleżyński

Małecki

2013

J Therm Anal Calorim

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The results of first principles calculations of band structure, density of states, and electron density topology of alkali metal oxalates are presented. The calculations have been carried out with WIEN2k ab initio program, using highly precise full potential linearized augmented plane wave method within density functional theory formalism. Calculated total electron density has been used in calculations of its topological properties (according to Bader's quantum theory of atoms in molecules formalism) and Cioslowski and Mixon's topological bond orders. The obtained results show important similarities between electronic structure and electron density topology for all analyzed structures with electronic structure close to Fermi energy typical for ionic compounds and bonding which is mainly covalent within the oxalate anion (with partly ionic character of carbon-oxygen bonds) and strongly ionic between oxalate anion and cationic sublattice. These results have been used as a basis for theoretical analysis of thermal decomposition process described in detail in part II of this paper (where also the results of additional calculations of atomic and bond valences, bond strengths and strains are presented).

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Section: Introductionmentioning

confidence: 99%

Theoretical studies of electronic structure and structural properties of anhydrous alkali metal oxalates

Koleżyński

Małecki

2013

J Therm Anal Calorim

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“…Besides, this procedure suffers from the disadvantages of chemical inhomogeneity leading to coarse particle size for the product. In contrast, the wet chemical syntheses routes offer homogeneous products at lower temperatures in shorter durations [7][8][9]. There a few research papers exist, indicating that CCTO could be prepared by routes other than the solid state reactions [10][11][12][13][14].…”

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confidence: 99%

Synthesis of nanoparticles of the giant dielectric material, CaCu3Ti4O12 from a precursor route

Thomas

Dwarakanath

Varma

et al. 2008

J Therm Anal Calorim

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A complex oxalate precursor, O H 9 ) O C ( ) TiO ( CaCu 2 8 4 2 4 3 • ,(CCT-OX), was synthesized and the precipitate that obtained was confirmed to be monophasic by the wet chemical analyses, X-ray diffraction, FT-IR absorption and TG/DTA analyses. The thermal decomposition of this oxalate precursor led to the formation of phase-pure calcium copper titanate, CaCu 3 Ti 4 O 12 , (CCTO) at ≥ 680 o C. The bright-field TEM micrographs revealed that the size of the as synthesized crystallites to be in the 30-80nm range. The powders so obtained had excellent sinterability resulting in high density ceramics which exhibited giant dielectric constants upto 40,000 (1 kHz) at 25 o C, accompanied by low dielectric losses, < 0.07.

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