Formation of crystalline metal oxides at low temperatures
AssigneeUniversity of New Mexico
InventorsMark Hampden-Smith, Clive Chandler
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Abstract
Metal oxides are formed at low temperatures by the process of providing a class of divalent metal hydroxycarboxylates designed to react with metal alkoxide compounds such as B(OR').sub.4, where B=Ti, Zr, Sn and R'=an alkyl group with the elimination of two equivalents of alcohol to form species with integral or non-integral stoichiometry. The reaction produces an intermediate compound which after thermolysis at 350.degree. C. in O.sub.2, results in formation of crystalline perovskite phase materials of general formula ABO.sub.3, A.sub.x A'.sub.1-x BO.sub.3 and AB.sub.x B'.sub.1-x O.sub.3.
Claims12
The method of preparing crystalline mixed metal oxide compounds for deposition or other purposes at temperatures below 400 degrees centigrade comprising the steps of:
- a) preparing a metal hydroxycarboxylate compound which reacts with a metal alkoxide compound to form one or more soluble intermediate compounds devoid of alcohol, and
- b) thermally decomposing said intermediate compound at a temperature of about 350 degrees centigrade in an O.sub.2 environment, resulting in the formation of a crystalline mixed metal oxide compound.
The method of forming crystalline metal oxide materials comprising the steps of:
- a) synthesizing a class of divalent metal hydroxycarboxylates of general formula A(O.sub.2 CCR.sub.2 OH).sub.2 where A=Pb, Ca, Sr, Ba and R-an alkyl group;
- b) reacting in an O.sub.2 atmosphere at about 350 degrees centigrade, said hydroxycarboxylates with precursor metal alkoxide compounds of the form B(OR').sub.4 where B=Ti, Zr, Sn, and R'=an alkyl group to from crystalline metal oxide species of either integral stoichiometric phase in the form ABO.sub.3 or non-integral stoichiometric phase in the form AB.sub.x B.sub.(1-x) O.sub.3 or A.sub.x A'.sub.1-x BO.sub.3.
Dependencies are inferred from the claim text.