| (19) |
 |
|
(11) |
EP 0 493 019 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
19.11.1992 Bulletin 1992/47 |
| (43) |
Date of publication A2: |
|
01.07.1992 Bulletin 1992/27 |
| (22) |
Date of filing: 20.12.1991 |
|
|
| (84) |
Designated Contracting States: |
|
AT BE CH DE DK ES FR GB GR IT LI LU MC NL SE |
| (30) |
Priority: |
21.12.1990 IE 464490
28.02.1991 IE 67191
18.09.1991 IE 328191
|
| (71) |
Applicant: THE PROVOST, FELLOWS AND SCHOLARS OF THE COLLEGE OF THE HOLY AND UNDIVIDED TRINITY
OF QUEEN ELIZABETH NEAR DUBLIN |
|
Dublin 2 (IE) |
|
| (72) |
Inventors: |
|
- Coey, John Michael David
Castleknock,
County Dublin (IE)
- Sun, Hong
Dublin 9 (IE)
- Hurley, David Patrick
Lucan,
County Dublin (IE)
|
| (74) |
Representative: Baverstock, Michael George Douglas et al |
|
BOULT, WADE & TENNANT
27 Furnival Street
London, EC4A 1PQ
London, EC4A 1PQ (GB) |
|
| |
|
| (54) |
Process for modifying magnetic materials and magnetic materials therefrom |
(57) A process is provided for modifying the magnetic properties of an intermetallic compound
comprising at least iron, or a combination of iron with at least one transition metal,
and at least one rare earth element. The process comprises heating the intermetallic
compound in a reaction gas containing at least one element of groups IIIA, IVA or
VIA of the Periodic Table in the gaseous phase to interstitially incorporate the element
or elements of these groups into the crystal lattice of the intermetallic compound.
Novel magnetic materials showing easy uniaxial anisotropy, increased spontaneous magnetization
and Curie temperatures are produced by the process.