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Manganite perovskite ceramics, their precursors and methods for forming

Patent ·
OSTI ID:1172160
;
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.
Research Organization:
The United States Department of Energy, Washington, DC (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
FG02-91ER45439
Assignee:
The United States Department of Energy (Washington, DC)
Patent Number(s):
8,974,855
Application Number:
11/198,676
OSTI ID:
1172160
Country of Publication:
United States
Language:
English

References (15)

Metal Propionate Synthesis of Magnetoresistive La1−x(Ca,Sr)xMnO3 Thin Films journal October 1997
Preparation of La 0.67 Ca 0.33 MnO 3 Nanophase Powders and Films from Alkoxide Precursors journal May 2002
Preparation of La0.75Sr0.25MnO3 Nano-Phase Powders and Films from Alkoxide Precursors journal January 2003
Dielectric Properties and Strain Analysis in Paraelectric ZrTiO 4 Thin Films Deposited by DC Magnetron Sputtering journal July 2000
Manganese(II)Alkoxides journal February 1979
Thousandfold Change in Resistivity in Magnetoresistive La-Ca-Mn-O Films journal April 1994
Advanced chemical deposition techniques - from research to production journal January 2001
Piezoresponse force microscopy of lead titanate nanograins possibly reaching the limit of ferroelectricity journal December 2002
Synthesis of cadmium tungstate films via sol–gel processing journal June 2003
Sol–gel epitaxial growth of La 1− x Ca x MnO 3 with colossal magnetoresistance effect journal July 1996
Fabrication of Lanthanum Manganese Oxide Thin Films on Yttria-Stabilized Zirconia Substrates by a Chemically Modified Alkoxide Method journal October 2001
Processing Magnetoresistive Thin Films Via Chemical Solution Deposition journal April 1999
Towards the limit of ferroelectric nanosized grains journal January 2003
Giant Magnetoresistance and Related Properties of Rare-Earth Manganates and Other Oxide Systems journal January 1996
Nanosize ferroelectric oxides – tracking down the superparaelectric limit journal March 2005

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36 MATERIALS SCIENCE