Title: Manganite perovskite ceramics, their precursors and methods for forming

Abstract

Disclosed are a variety of ceramics having the formula Ln.sub.1-xM.sub.xMnO.sub.3, where 0.Itoreq.x.Itoreq.1 and where Ln is La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu or Y; M is Ca, Sr, Ba, Cd, or Pb; manganite precursors for preparing the ceramics; a method for preparing the precursors; and a method for transforming the precursors into uniform, defect-free ceramics having magnetoresistance properties. The manganite precursors contain a sol and are derived from the metal alkoxides: Ln(OR).sub.3, M(OR).sub.2 and Mn(OR).sub.2, where R is C.sub.2 to C.sub.6 alkyl or C.sub.3 to C.sub.9 alkoxyalkyl, or C.sub.6 to C.sub.9 aryl. The preferred ceramics are films prepared by a spin coating method and are particularly suited for incorporation into a device such as an integrated circuit device.

Inventors:

Payne, David Alan; Clothier, Brent Allen

Issue Date:

Tue Mar 10 00:00:00 EDT 2015

Research Org.:

The United States Department of Energy, Washington, DC (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1172160

Patent Number(s):

8974855

Application Number:

11/198,676

Assignee:

The United States Department of Energy (Washington, DC)

Patent Classifications (CPCs):

C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01G - COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F

C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01P - INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

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C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01G - COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F

C01G45/1264 - {containing rare earth, e.g. La1-xCaxMnO3, LaMnO3}

C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01P - INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

C01P2002/34 - perovskite-type
C01P2006/40 - Electric properties

C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA

C04B2235/3208 - Calcium oxide or oxide-forming salts thereof, e.g. lime
C04B2235/3213 - Strontium oxides or oxide-forming salts thereof
C04B2235/3215 - Barium oxides or oxide-forming salts thereof
C04B2235/3224 - Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
C04B2235/3225 - Yttrium oxide or oxide-forming salts thereof
C04B2235/3227 - Lanthanum oxide or oxide-forming salts thereof
C04B2235/3229 - Cerium oxides or oxide-forming salts thereof
C04B2235/3284 - Zinc oxides, zincates, cadmium oxides, cadmiates, mercury oxides, mercurates or oxide forming salts thereof
C04B2235/3296 - Lead oxides, plumbates or oxide forming salts thereof, e.g. silver plumbate
C04B2235/441 - Alkoxides, e.g. methoxide, tert-butoxide
C04B2235/6562 - Heating rate
C04B2235/768 - Perovskite structure ABO3
C04B35/016 - {based on manganites}
C04B35/624 - Sol-gel processing
C04B35/6264 - {Mixing media, e.g. organic solvents}

C - CHEMISTRY C23 - COATING METALLIC MATERIAL C23C - COATING METALLIC MATERIAL

C23C18/1208 - {Oxides, e.g. ceramics}
C23C18/1254 - {Sol or sol-gel processing}
C23C18/1275 - {performed under inert atmosphere}
C23C18/1283 - {Control of temperature, e.g. gradual temperature increase, modulation of temperature}

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DOE Contract Number:  

FG02-91ER45439

Resource Type:

Patent

Resource Relation:

Patent File Date: 2005 Aug 05

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE