US5308601A
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Formation of crystalline metal oxides at low temperatures
Assignee: University of New Mexico
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Filing: 1992-09-18
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Granted: 1994-05-03
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Expires: 2012-09-18
Abstract
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') 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° C. in O 2 , results in formation of crystalline perovskite phase materials of general formula ABO 3 , A x A' 1-x BO 3 and AB x B' 1-x O 3 .
Inventors
- 👤 Mark Hampden-Smith
- 👤 Clive Chandler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:17
CPC Classifications
C; C07; C07C; C07C59/00; C07C59/01; C07C59/06; C01; C01B; C01B13/00; C01B13/14; C01B13/18; C01B13/185; C01G; C01G19/00; C01G23/00; C01G23/003; C01G25/00; C01P; C01P2002/00; C01P2002/30; C01P2002/34; C01P2002/50; C01P2002/70; C01P2002/72; C01P2002/80; C01P2002/88; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12375
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
79 words
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 2 environment, resulting in the formation of a crystalline mixed metal oxide compound.
Claim 2
Independent Claim
79 words
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 2 environment, resulting in the formation of a crystalline mixed metal oxide compound.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein the crystalline mixed metal compound has integral stoichiometry.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein the crystalline mixed metal compound has nonintegral stoichiometry.
Claim 5
Dependent Claim
24 words
The method of claim 1 wherein the metal in the metal hydroxycarboxylate compound is of the group consisting of Ca, Sr, Ba, and Pb.
Claim 6
Dependent Claim
23 words
The method of claim 1 wherein the metal in the metal alkoxide compound is of the group consisting of Ti, Zr, and Sn.
Claim 7
Dependent Claim
29 words
The method of claim 1 wherein the metal hydroxycarboxylate compound has the general formula A(O 2 CCR 2 OH) 2 where A=Pb, Ca, Sr, Ba and R=an alkyl group.
Claim 8
Dependent Claim
25 words
The method of claim 6 wherein the metal hydroxycarboxylate compound has been prepared according to the equation A(CO.sub.3)+2HO.sub.2 CCR.sub.2 OH--H.sub.2 O→.A(O.sub.2 CCR.sub.2 OH).sub.2 +H.sub.2 O+CO.sub.2.
Claim 9
Dependent Claim
23 words
The method of claim 6 wherein the metal in said metal alkoxide compound has the general formula B(OR') 4 where B=Ti, Zr, Sn.
Claim 10
Independent Claim
106 words
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 2 CCR 2 OH) 2 where A=Pb, Ca, Sr, Ba and R-an alkyl group; b) reacting in an O 2 atmosphere at about 350 degrees centigrade, said hydroxycarboxylates with precursor metal alkoxide compounds of the form B(OR') 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 3 or non-integral stoichiometric phase in the form AB x B.sub.(1-x) O 3 or A x A' 1-x BO 3 .
Claim 11
Independent Claim
106 words
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 2 CCR 2 OH) 2 where A=Pb, Ca, Sr, Ba and R-an alkyl group; b) reacting in an O 2 atmosphere at about 350 degrees centigrade, said hydroxycarboxylates with precursor metal alkoxide compounds of the form B(OR') 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 3 or non-integral stoichiometric phase in the form AB x B.sub.(1-x) O 3 or A x A' 1-x BO 3 .
Claim 12
Dependent Claim
28 words
The method of claim 9 wherein the metal alkoxide compound for the integral stoichiometric phase is in the form A(O 2 CCR 2 O) 2 B(OR') 2 .
Claim 13
Dependent Claim
71 words
The method of claim 9 wherein the precursor metal alkoxide compound for the nonintegral stoichiometric phase is in the form xA(O 2 CCR 2 O) 2 B(OR') 2 +(1-x)A (O 2 CCR 2 O) 2 B'(OR) 2 or xA(O 2 CCR 2 O) 2 B(OR') 2 +(1-x)A' x)A'(O 2 CCR 2 O) 2 B(OR) 2 wherein case of stoichiometry materials A does not equal A' and B does not equal B'.
Claim 14
Dependent Claim
65 words
The method of claim 9 wherein the precursor metal alkoxide compound has been hydrolyzed for the non-integral stoichiometric phase and is in the form xA(O 2 CCR 2 O) 2 B(OH) 2 +(1-x)A(O 2 CCR 2 B(OH) 2 +(1-x)A'(O 2 CCR 2 O) 2 B(OH) 2 where is the case of non-integral stoichiometry materials A does not equal A' and B does not equal B'.
References Cited (Backward Citations)
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