PROCESS FOR PRODUCING HIGH-PURITY SUBMICRON BARIUM AND STRONTIUM TITANATE POWDERS

• US 3,647,364 A
• Filed: 01/06/1970
• Issued: 03/07/1972
• Est. Priority Date: 01/06/1970
• Status: Expired due to Term

• Current Assignee: Jonathan S. Smith, Khodabakhsh S. Mazdiyasni, Richard T. Dolloff
• Original Assignee: Jonathan S. Smith, Khodabakhsh S. Mazdiyasni, Richard T. Dolloff
• Inventors: Mazdiyasni, Khodabakhsh S., Dolloff, Richard T., Smith, Jonathan S.
• Application Number:
  US05/001,007
• Time in Patent Office: 791 Days
• US Class Current: 423/598
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: C01G 23/006 Alkaline earth titanates
• CPC Class Codes: C01P 2002/72 by d-values or two theta-values, e.g. as X-ray diagram
• CPC Class Codes: C01P 2002/76 by a space-group or by other symmetry indications
• CPC Class Codes: C01P 2002/82 by IR- or Raman-data
• CPC Class Codes: C01P 2004/51 Particles with a specific particle size distribution
• CPC Class Codes: C01P 2004/64 Nanometer sized, i.e. from 1-100 nanometer
• CPC Class Codes: C01P 2006/80 Compositional purity
• CPC Class Codes: C04B 35/47 based on strontium titanates

Abstract

Barium titanate and strontium titanate powders having a particle size in the range of 50 to 150 angstroms and a purity of 99.75 percent or higher are prepared by the hydrolytic decomposition of a barium or strontium alcoholate and a titanium alcoholate. The barium and strontium titanate powders are useful in the preparation of dense ferroelectric bodies, thin film electronic components, and piezoelectric materials.

Claims

2. A process according to claim 1 in which said compound is barium bis isopropoxide and barium titanate is recovered from said drying step.

3. A process according to claim 1 in which said compound is strontium bis isopropoxide and strontium titanate is recovered from said drying step.

4. A process according to claim 1 in which said solution is refluxed for a period of from about 1 to 5 hours.

5. A process according to claim 1 in which said solvent is an alcohol or an aromatic hydrocarbon.