Title:
RARE EARTH OXIDE POWDER
Document Type and Number:
WIPO Patent Application WO/2024/004411
Kind Code:
A1
Abstract:
Provided is a powder of an oxide of at least one type of rare earth element other than Ce, wherein the oxide satisfies (a) or (b). (a) The primary particle diameter is 10-60 nm, and (I) or (II) is satisfied. (I) The D100 value is 1-10 µm, as determined by means of a laser diffraction/scattering particle size distribution measurement method carried out using an ultrasonic wave dispersion treatment. (II) If the true density of the rare earth oxide is taken to be ρ (g/cm3), the difference (PAD-PTD) between the porosity PAD (%) calculated from the initial bulk density AD and the porosity PTD (%) calculated from the tap bulk density TD is 2.0-5.0%. PAD=(1-AD/ρ)×100 (%). PTD=(1-TD/ρ)×100 (%). (b) The primary particle diameter is not less than 10 nm and less than 100 nm, and (III) and (IV) are satisfied. (III) A numerical value obtained by multiplying the true density (g/cm3) by the volume (cm3/g) of pores having pore diameters of 0.005-100 µm is 3-14. (IV) A numerical value obtained by multiplying the true density (g/cm3) by the volume (cm3/g) of pores having pore diameters of 5-50 nm is 0-2.0.
Inventors:
NAGANO YUTARO (JP)
KUBO MASAFUMI (JP)
DAN MINAMI (JP)
KUBO MASAFUMI (JP)
DAN MINAMI (JP)
Application Number:
PCT/JP2023/018103
Publication Date:
January 04, 2024
Filing Date:
May 15, 2023
Export Citation:
Assignee:
NIPPON YTTRIUM CO LTD (JP)
International Classes:
C01F17/218; C01F17/206; C01F17/224; C23C4/11
Foreign References:
| JP2002029742A | 2002-01-29 | |||
| JP2004083350A | 2004-03-18 | |||
| JP2014227334A | 2014-12-08 | |||
| JPH05270822A | 1993-10-19 | |||
| JPH0769623A | 1995-03-14 | |||
| JPH0967119A | 1997-03-11 | |||
| JPH06305726A | 1994-11-01 |
Attorney, Agent or Firm:
SHOWA INTERNATIONAL PATENT FIRM (JP)
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