Patent US3848083A successfully refreshed from Google Patents.
Patent US3923675A successfully refreshed from Google Patents.
US3923675A
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Method for preparing lead lanthanum zirconate-titanate powders
Assignee: United States Department of the Air Force
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Filing: 1973-08-09
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Granted: 1975-12-02
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Expires: 1993-08-09
Abstract
Abstract High purity, submicron-size lead lanthanum zirconate-titanate powders are prepared by the simultaneous hydrolytic decomposition of lead isoamyloxide, lanthanum isopropoxide, and zirconium and titanium tertiary amyloxides. The powders are a source of raw material for consolidation into theoretically dense ferroelectric, antiferroelectric and/or electrooptic bodies with superior electrical and optical properties.
Inventors
- 👤 Khodabakhsh S Mazdiyasni
- 👤 Leanne M Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:26
CPC Classifications
C; C01; C01G; C01G25/00; C01G25/006; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/49; C04B35/491; C01P; C01P2002/00; C01P2002/70; C01P2002/76; C01P2002/77; C01P2004/00; C01P2004/60; C01P2004/62; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
121 words
A METHOD FOR PREPARING LEAD LANTHANUM ZIRCONATE TITANATE (PLZT) POWDER WHICH COMPRISES ADDING TO WATER A MIXTURE CONSISTING ESSENTIALLY OF LEAD ISOAMYLOXIDE, A LANTHANUM ALKOXIDE, A ZIRCOIUM ALKOXIDE AND A TITANIUM ALKOXIDE IN SOLUTION IN ISOAMYL ALCOHOL, THE ALKOXIDES CORRESPONDING TO THE FORMULAE LA(OR)3, ZR(OR)4, AND TI(OR)4, WHEREIN R IS AN ALKYL RADICAL CONTAINING 3 TO 6, INCLUSIVE, CARBON ATOMS; REFLUXING THE SOLUTION AT A TEMPERATURE IN THE RANGE OF ABOUT 70* TO 75*C FOR A PERIOD OF ABOUT 2 TO 5 HOURS TO HYDROLYTICALLY DECOMPOSE SAID ISOAMYLOXIDE AND ALKOXIDES INTO A HYDROXIDE OF LEAD, LANTHANUM, ZIRCONIUM AND TITANIUM; WASHING THE RESULTING, HYDROXIDE; AND DRYING THE HYDROXIDE BY HEATING SAME UNDER A VACUUM, THEREBY OBTAINING A HIGH PURITY, AMORPHOUS PLZT POWDER.
Claim 2
Independent Claim
121 words
A METHOD FOR PREPARING LEAD LANTHANUM ZIRCONATE TITANATE (PLZT) POWDER WHICH COMPRISES ADDING TO WATER A MIXTURE CONSISTING ESSENTIALLY OF LEAD ISOAMYLOXIDE, A LANTHANUM ALKOXIDE, A ZIRCOIUM ALKOXIDE AND A TITANIUM ALKOXIDE IN SOLUTION IN ISOAMYL ALCOHOL, THE ALKOXIDES CORRESPONDING TO THE FORMULAE LA(OR)3, ZR(OR)4, AND TI(OR)4, WHEREIN R IS AN ALKYL RADICAL CONTAINING 3 TO 6, INCLUSIVE, CARBON ATOMS; REFLUXING THE SOLUTION AT A TEMPERATURE IN THE RANGE OF ABOUT 70* TO 75*C FOR A PERIOD OF ABOUT 2 TO 5 HOURS TO HYDROLYTICALLY DECOMPOSE SAID ISOAMYLOXIDE AND ALKOXIDES INTO A HYDROXIDE OF LEAD, LANTHANUM, ZIRCONIUM AND TITANIUM; WASHING THE RESULTING, HYDROXIDE; AND DRYING THE HYDROXIDE BY HEATING SAME UNDER A VACUUM, THEREBY OBTAINING A HIGH PURITY, AMORPHOUS PLZT POWDER.
Claim 3
Dependent Claim
33 words
The method according to claim 1 in which the amounts of lead isoamyloxide and lanthanum, zirconium and titanium alkoxides in the mixture are such as to obtain a product having a desired stoichiometry.
Claim 4
Dependent Claim
20 words
The method according to claim 2 in which the hydroxide is washed successively with high purity water and an alochol.
Claim 5
Dependent Claim
32 words
The method according to claim 3 in which the mol ratio of lead isoamyloxide:lanthanum alkoxide:zirconium alkoxide:titanium alkoxide in the mixture falls in the following ranges: (0.80-0.98):(0.020 to 0.2):(0.095 to 0.8964):(0.095 to 0.8964).
Claim 6
Dependent Claim
32 words
The method according to claim 4 in which 2 to 10 weight percent of the amount of lead isoamyloxide in the mixture is added to the solution during the period of reflux.
Claim 7
Dependent Claim
42 words
The method according to claim 5 in which the amorphous powder is calcined by heating same at a temperature ranging from 300 to 500*C for a period of about 15 minutes to 1 hour, thereby converting the powder to a crystalline form.
Claim 8
Dependent Claim
19 words
The method according to claim 4 in which the mol ratio of lead isoamyloxide:lanthanum alkoxide:zirconium alkoxide:titanium alkoxide is 0.9:0.1:0.63375:0.34125.
Claim 9
Dependent Claim
29 words
The method according to claim 7 in which the lanthanum alkoxide is lanThanum isopropoxide, the zirconium alkoxide is zirzonium tertiary amyloxide and the titanium alkoxide is titanium tertiary amyloxide.
Claim 10
Dependent Claim
42 words
The method according to claim 8 in which the amorphous powder is calcined by heating same at a temperature ranging from 300* to 500*C for a period of about 15 minutes to 1 hour, thereby converting the powder to a crystalline form.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |