Barium titanate and electronic parts using the material

• US 20060172880A1
• Filed: 12/18/2003
• Published: 08/03/2006
• Est. Priority Date: 12/18/2002
• Status: Abandoned Application

• Current Assignee: Showa Denko KK (Resonac Holdings Corp.)
• Original Assignee: Showa Denko KK (Resonac Holdings Corp.)
• Inventors: Shirakawa, Akihiko, Yokouchi, Hitoshi
• Application Number:
  US10/539,593
• Publication Number:
  US 20060172880A1
• Time in Patent Office: Days
• US Class Current: 501/137
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: C01F 11/02 Oxides or hydroxides production of lime C04B2/00
• CPC Class Codes: C01G 23/003 Titanates C01G23/001 takes precedence
• CPC Class Codes: C01G 23/006 Alkaline earth titanates
• CPC Class Codes: C01P 2002/34 perovskite-type (ABO3)
• CPC Class Codes: C01P 2002/77 by unit-cell parameters, atom positions or structure diagrams
• CPC Class Codes: C01P 2002/82 by IR- or Raman-data
• CPC Class Codes: C01P 2004/04 obtained by TEM, STEM, STM or AFM
• CPC Class Codes: C01P 2004/64 Nanometer sized, i.e. from 1-100 nanometer
• CPC Class Codes: C01P 2006/12 Surface area
• CPC Class Codes: C01P 2006/13 thermal stability thereof at high temperatures
• CPC Class Codes: C01P 2006/40 Electric properties
• CPC Class Codes: C04B 2235/3206 Magnesium oxides or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3208 Calcium oxide or oxide-forming salts thereof, e.g. lime
• CPC Class Codes: C04B 2235/3213 Strontium oxides or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3215 Barium oxides or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3217 Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
• CPC Class Codes: C04B 2235/3224 Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
• CPC Class Codes: C04B 2235/3225 Yttrium oxide or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3227 Lanthanum oxide or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3229 : Cerium oxides or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3232 : Titanium oxides or titanates, e.g. rutile or anatase
• CPC Class Codes: C04B 2235/3236 : Alkaline earth titanates
• CPC Class Codes: C04B 2235/3244 : Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3251 : Niobium oxides, niobates, tantalum oxides, tantalates, or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3258 : Tungsten oxides, tungstates, or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3262 : Manganese oxides, manganates, rhenium oxides or oxide-forming salts thereof, e.g. MnO
• CPC Class Codes: C04B 2235/3272 : Iron oxides or oxide forming salts thereof, e.g. hematite, magnetite
• CPC Class Codes: C04B 2235/3279 : Nickel oxides, nickalates, or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3281 : Copper oxides, cuprates or oxide-forming salts thereof, e.g. CuO or Cu2O
• CPC Class Codes: C04B 2235/3284 : Zinc oxides, zincates, cadmium oxides, cadmiates, mercury oxides, mercurates or oxide forming salts thereof
• CPC Class Codes: C04B 2235/3293 : Tin oxides, stannates or oxide forming salts thereof, e.g. indium tin oxide [ITO]
• CPC Class Codes: C04B 2235/3298 : Bismuth oxides, bismuthates or oxide forming salts thereof, e.g. zinc bismuthate
• CPC Class Codes: C04B 2235/3409 : Boron oxide, borates, boric acids, or oxide forming salts thereof, e.g. borax
• CPC Class Codes: C04B 2235/3418 : Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
• CPC Class Codes: C04B 2235/3436 : Alkaline earth metal silicates, e.g. barium silicate
• CPC Class Codes: C04B 2235/449 : Organic acids, e.g. EDTA, citrate, acetate, oxalate
• CPC Class Codes: C04B 2235/5409 : expressed by specific surface values
• CPC Class Codes: C04B 2235/5445 : submicron sized, i.e. from 0,1 to 1 micron
• CPC Class Codes: C04B 2235/5454 : nanometer sized, i.e. below 100 nm
• CPC Class Codes: C04B 2235/6582 : Hydrogen containing atmosphere
• CPC Class Codes: C04B 2235/72 : Products characterised by the absence or the low content of specific components, e.g. alkali metal free alumina ceramics
• CPC Class Codes: C04B 2235/761 : Unit-cell parameters, e.g. lattice constants
• CPC Class Codes: C04B 2235/768 : Perovskite structure ABO3
• CPC Class Codes: C04B 35/4682 : based on BaTiO3 perovskite phase
• CPC Class Codes: C04B 35/4684 : containing lead compounds C04B35/472 takes precedence
• CPC Class Codes: C04B 35/624 : Sol-gel processing
• CPC Class Codes: C04B 35/62605 : Treating the starting powders individually or as mixtures
• CPC Class Codes: C04B 35/62645 : Thermal treatment of powders or mixtures thereof other than sintering
• CPC Class Codes: C04B 35/62675 : characterised by the treatment temperature
• CPC Class Codes: H01G 4/1227 : based on alkaline earth titanates
• CPC Class Codes: H10N 30/8536 : Alkaline earth metal based oxides, e.g. barium titanates
• CPC Class Codes: Y10T 428/2982 : Particulate matter [e.g., sphere, flake, etc.]

Abstract

A barium titanate, which is single crystal in the form of particles, said particles comprising particles without a void having a diameter of 1 nm or more in an amount of 20% or more by number of the total particles. A dielectric material comprising the barium titanate as well as a capacitor comprising the dielectric material.

Claims

1. A barium titanate, which is single crystal in the form of particles, said particles comprising particles without a void having a diameter of 1 nm or more in an amount of 20% or more by number of the total particles.

2. The barium titanate according to claim 1, wherein said particles comprises particles without a void having a diameter of 1 nm or more in an amount of 50% or more by number of the total particles.

3. The barium titanate according to claim 1, wherein said particles comprises particles without a void having a diameter of 1 nm or more in an amount of 80% or more by number of the total particles.

4. The barium titanate according to claim 1, wherein the particles have a BET specific surface area of 0.1 m²/g or more.

5. The barium titanate according to claim 1, wherein no abrupt peak is defected at around 3500 cm⁻

1 by infrared spectrum analysis of the particles after heat treatment thereof at 700°

C.

6. The barium titanate according to claim 1, comprising at least one element selected from the group consisting of Sn, Zr, Ca, Sr, Pb, Ho, Nd, Y, La, Ce, Mg, Bi, Ni, Al, Si, Zn, B, Nb, W, Mn, Fe, Cu, and Dy, said at least one element being in an amount of less than 5 mol % (0 mol % inclusive) on the basis of the entirety of BaTiO₃.

7. The barium titanate according to claim 1, which is in the form of powder.

8. The barium titanate according to claim 1, which is synthesized by wet process.

9. A slurry comprising the barium titanate according to claim 1.

10. A paste comprising the barium titanate according to claim 1.

11. A dielectric material comprising barium titanate according to claim 1.

12. A dielectric ceramic comprising barium titanate according to claim 1.

13. A piezoelectric material comprising barium titanate according to claim 1.

14. A piezoelectric ceramic material comprising barium titanate according to claim 1.

15. A dielectric film material comprising barium titanate according to claim 1.

16. A capacitor comprising the dielectric material according to claim 11.

17. A capacitor comprising the piezoelectric material according to claim 13.

18. A capacitor comprising the dielectric film according to claim 15.

19. An integrated capacitor comprising the dielectric film according to claim 15.

20. A printed board comprising the dielectric film according to claim 15.

21. An electronic equipment comprising the capacitor according to claim 16.