Single-Component Routes to Perovsktte Phase Mixed Metal Oxides

1992 ◽  
Vol 271 ◽  
Author(s):  
Clive D. Chandlertw ◽  
M. J. Hampden-Smitht ◽  
C. J. Brinker
Keyword(s):  
Metal Oxides ◽  
Low Temperatures ◽  
Perovskite Phase ◽  
Divalent Metal ◽  
Single Component ◽  
Metal Alkoxide ◽  
Mixed Metal Oxides ◽  
Mixed Metal ◽  
Metal Organic ◽  
Organic Precursors

ABSTRACTCrystalline perovskite phase mixed metal oxides have been prepared at low temperatures from single-component mixed metal-organic precursors specifically designed for this purpose. Pyridine solutions of divalent metal α-hydroxycarboxylates of general empirical formula A(O2CMe2OH)2 where A = Pb, Ca, Sr, Ba; Me = methyl, react with metal alkoxide compounds such as B(OR')4, where B = Ti, Zr, Sn with the elimination of two equivalents of alcohol to form species with a fixed A:B stoichiometry of 1:1 according to the equation below.

Chemical aspects of solution routes to perovskite-phase mixed-metal oxides from metal-organic precursors

1993 ◽  
Vol 93 (3) ◽  
pp. 1205-1241 ◽  
Author(s):  
Clive D. Chandler ◽  
Christophe. Roger ◽  
Mark J. Hampden-Smith
Keyword(s):  
Metal Oxides ◽  
Perovskite Phase ◽  
Mixed Metal Oxides ◽  
Mixed Metal ◽  
Metal Organic ◽  
Organic Precursors ◽  
Solution Routes

Synthetic Routes to Perovskite Phase Mixed Metal Oxides

1991 ◽  
Vol 243 ◽  
Author(s):  
Clive D. Chandler ◽  
Mark J. Hampden-Smith ◽  
Jeffrey Brinker
Keyword(s):  
Metal Oxides ◽  
Lead Titanate ◽  
Perovskite Phase ◽  
Single Component ◽  
Mixed Metal Oxides ◽  
Reaction Conditions ◽  
Lead Carbonate ◽  
Mixed Metal ◽  
Loss Of Weight ◽  
Synthetic Routes

AbstractWe are developing strategies to form single-component precursors to perovskite phase mixed metal oxides where the stoichiometry of the precursor is fixed at the molecular level to be that of the final desired phase. These strategies ean be applied to the formation of perovskite phase thin films. Two such methods are described herein, relying on ester elimination and alcohol elimination reactions. We have found the reaction between lead(II) acetate and titanium(IV) isopropoxide in ethanol results in ligand redistribution at room temperature. Reactions between (β-diketonate)2M(OR)2 where M = Ti, Zr and Sn and lead(II) acetate do not result in any detectable ester elimination under the reaction conditions employed, and this approach was not successful. Alcohol elimination experiments have been explored as an alternative strategy using a bifunctional glycolate ligand. Lead carbonate reacted with glycolic acid to form the corresponding lead glycolate complex Pb(O2CCH2OH)2. This compound reacted with (β-diketonate)2M(OR)2, M = Ti and Sn, to eliminate two equivalents of alcohol and form the corresponding single component (β-diketonate)2M(OCH2CO2)2Pb complexes. These complexes start to thermally decompose at 150°C and loss of weight is complete by 450°C to yield a product whose weight loss corresponds to the formation of PbTiO3 for M = Ti. Bulk thermolysis of a sample of (dpm)2Ti(OCH2CO2)2Pb at 400°C resulted in formation of crystalline perovskite phase lead titanate together with PbO, massicot and α-PbO phases.

Aerosol Routes to Perovskite Phase Mixed Metal Oxides

1993 ◽  
Vol 310 ◽  
Author(s):  
C.D. Chandler ◽  
Q. Powell ◽  
M.J. Hampden-Smith ◽  
T.T. Kodas
Keyword(s):  
Metal Oxide ◽  
Low Temperatures ◽  
Perovskite Phase ◽  
Mixed Metal Oxide ◽  
Single Source ◽  
Single Source Precursors ◽  
Mixed Metal ◽  
Oxide Powders ◽  
Metal Organic ◽  
Oxide Particles

AbstractSub-micron sized metal oxide particles were formed via aerosol decomposition using single-source mixed metal-organic precursors specifically designed to decompose at low temperatures. The advantage of these single-source precursors over mixtures of individual precursors is that each particle contains a fixed stoichiometry and molecular level homogeneity. Furthermore, the loss of volatile intermediates (such as PbO) may be avoided. Aerosol processing routes can produce uniform sub-micron sized powder that can be sintered at low temperatures for various thin film and membrane applications. The single-source precursors were prepared in pyridine by reaction of divalent metal α-hydroxycarboxylates of general empirical formula A(O2CCMe2OH)2 (where A = Pb, Ca, Sr, Ba; Me = methyl) with metal alkoxides (for example, Ti(O-i-Pr)4) with the elimination of two equivalents of alcohol. These species were then hydrolyzed in solution and yellow powders were isolated by removal of the pyridine solvent in vacuo. These powders were dissolved in water and used to prepare mixed metal oxide powders via spray pyrolysis. Phase-pure submicron-sized particles of PbTiO3 and BaTiO3 were produced at temperatures of 600-900 °C. The particles were hollow, ranged in size from 0.1 to 1 μm and consisted of 30-50 nm crystallites.

Synthesis and characterization of perovskite-phase mixed-metal oxides: lead titanate

1995 ◽  
Vol 5 (1) ◽  
pp. 151 ◽  
Author(s):  
Leo B. Archer ◽  
Clive D. Chandler ◽  
Richard Kingsborough ◽  
Mark J. Hampden-Smith
Keyword(s):  
Metal Oxides ◽  
Lead Titanate ◽  
Perovskite Phase ◽  
Synthesis And Characterization ◽  
Mixed Metal Oxides ◽  
Mixed Metal

Synthesis and microstructure of bismuth-based mixed metal oxides from organic precursors

1992 ◽  
Vol 188 ◽  
pp. 165-169 ◽  
Author(s):  
P. Conflant ◽  
M. Drache ◽  
J.P. Wignacourt ◽  
M. Lagrenee ◽  
B. Mernari
Keyword(s):  
Metal Oxides ◽  
Mixed Metal Oxides ◽  
Mixed Metal ◽  
Organic Precursors

A direct solvent-free conversion approach to prepare mixed-metal metal–organic frameworks from doped metal oxides

2021 ◽  
Vol 57 (29) ◽  
pp. 3587-3590
Author(s):  
Beili Yi ◽  
Haojie Zhao ◽  
Yue Zhang ◽  
Xiaomeng Si ◽  
Guanqun Zhang ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Metal Organic Frameworks ◽  
Solvent Free ◽  
Mixed Metal ◽  
Synthesis Strategy ◽  
Metal Metal ◽  
Metal Organic

We propose a novel solvent-free conversion strategy of Pt–ZnO to Pt-ZIF-8. This synthesis strategy may facilitate the discovery of MMOFs that have not been reported previously.

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