Method for the preparation of oxide powders

• US 20020146365A1
• Filed: 03/29/2002
• Published: 10/10/2002
• Est. Priority Date: 04/09/2001
• Status: Abandoned Application

• Current Assignee: Samsung Corning Company Limited (Corning Incorporated)
• Original Assignee: Samsung Corning Company Limited (Corning Incorporated)
• Inventors: Cho, Woo-Seok, Kim, Tae-Wan
• Application Number:
  US10/109,969
• Publication Number:
  US 20020146365A1
• Time in Patent Office: 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 23/003 Titanates C01G23/001 takes precedence
• CPC Class Codes: C01G 23/006 Alkaline earth titanates
• CPC Class Codes: C01G 25/00 Compounds of zirconium
• CPC Class Codes: C01G 27/006 Compounds containing, besides hafnium, two or more other elements, with the exception of oxygen or hydrogen
• CPC Class Codes: C01P 2002/72 by d-values or two theta-values, e.g. as X-ray diagram
• CPC Class Codes: C01P 2002/85 by XPS, EDX or EDAX data
• CPC Class Codes: C01P 2004/03 obtained by SEM
• CPC Class Codes: C01P 2004/52 highly monodisperse size distribution
• CPC Class Codes: C01P 2004/62 Submicrometer sized, i.e. from 0.1-1 micrometer
• CPC Class Codes: C01P 2004/64 Nanometer sized, i.e. from 1-100 nanometer

Abstract

A highly pure oxide powder can be prepared by a simple process comprising hydrothermally reacting oxide precursors in the presence of a metal complex-forming ligand.

Claims

1. A method for preparing an oxide powder, which comprises hydrothermally reacting (1) at least one first material selected from the group consisting of chlorides, nitrates, acetates, hydroxides and hydrates of the elements, Ca, Sr, Ba, Mg, La and Pb, and (2) at least one second material selected from the group consisting of alkoxides, oxides, halogenides, nitrates, sulfates and hydrolyates of the elements, Ti, Zr, Hf and Ce, in the presence of (3) a metal complex-forming ligand.

2. The method of claim 1, wherein the hydrothermal reaction is conducted in water with a base further added to the reaction mixture, the base being selected from the group consisting of a quaternary ammonium hydroxide, ammonia, an amine, and a mixture thereof.

3. The method of claim 1, wherein the metal complex-forming ligand is a compound which has an amino or carboxyl group and is capable of forming a complex with a metal ion of the firtst material.

4. The method of claim 3, wherein the metal complex-forming ligand is selected from the group consisting of EDTA (ethylenediamine tetracetic acid), NTA (nitrotriacetic acid), DCTA (trans-1,2-diaminocyclohexanetetracetic acid), DTPA (diethylenetriamine pentacetic acid), EGTA (bis-(aminoethyl)glycol ether-N,N,N′

,N′

-tetracetic acid), PDTA (propylenediamine tetracetic acid), BDTA (2,3-diaminobutane-N,N,N′

,N′

-tetracetic acid), and derivatives thereof.

5. The method of claim 1, wherein the second material is used in an amount ranging from 0.1 to 10 equivalents based on the amount of the first material.

6. The method of claim 1, wherein the hydrothermal reaction is conducted at a temperature ranging from 40 to 300°

C.

7. An oxide powder prepared by the method of any one of claims 1 to 6.

8. The oxide powder of claim 7, which has a particle size ranging from 20 nm to 1 μ

m.