Magnetic materials and processes for their production
AssigneeThe Provost, Fellows and Scholars of the College of the Holy and Undivided Trinity of Queen Elizabeth Near Dublin
InventorsJohn M. D. Coey, Hong Sun, David P. Hurley
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Abstract
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.
Claims33
A process for modifying the magnetic properties of an intermetallic compound having interstitial sites, the process comprising:
- providing the intermetallic compound, the intermetallic compound comprising:
- lanthanum, cerium, praseodymium, neodymium, promethium, samarium, curopium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, yttrium, thorium, hafnium, zirconium, or a combination of any two or more of these;
- and
- one or more of the group consisting of iron, and a combination of iron with at least one transition metal;
- heating said intermetallic compound in a reaction gas containing at least one element selected from groups IIIA, IVA or VIA of the CAS Periodic Table;
- and
- incorporating said element or elements of group IIIA, IVA or VIA of the CAS Periodic Table throughout said intermetallic compound at the interstitial sites.
A process for modifying the magnetic properties of an intermetallic compound, the process comprising:
- heating the intermetallic compound in a hydrocarbon gas to a temperature of from about 400.degree. to about 650.degree. C. at a pressure of 0.01 to 1000 bar to interstitially incorporate carbon into the crystal lattice of the intermetallic compound, the intermetallic compound comprising:
- iron or a combination of iron with at least one transition metal;
- and
- one or more of the group consisting of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, yttrium, thorium, hafnium, zirconium, and a combination of any two or more of these.
A process for modifying the magnetic properties of an intermetallic compound having interstitial sites, the process comprising:
- providing the intermetallic compound, the intermetallic compound comprising:
- lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, yttrium, thorium, hafnium, zirconium, or a combination of any two or more of these;
- and
- one or more of the group consisting of:
- iron and a combination of iron with at least one transition metal;
- heating said intermetallic compound in a hydrocarbon gas to a temperature of from about 400.degree. to about 650.degree. C. at a pressure of 0.01 to 1000 bar;
- and
- incorporating carbon throughout said intermetallic compound at the interstitial sites.
A process for modifying the magnetic properties of an intermetallic compound having interstitial sites, the process comprising:
- providing the intermetallic compound, the intermetallic compound comprising:
- one or more of the group consisting of yttrium, cerium, praseodymium, neodymium, samarium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, lutetium and a mixture of two or more of these;
- and
- one or more of the group consisting of iron, and a combination of iron with at least one transition metal;
- and
- heating the intermetallic compound in a reaction gas containing at least one element selected from groups IIIA, IVA or VIA of the CAS Periodic Table;
- and
- incorporating the element or elements of group IIIA, IVA or VIA of the CAS Periodic Table throughout the intermetallic compound at the interstitial sites.
A process for modifying the magnetic properties of an intermetallic compound having interstitial sites, the process comprising:
- providing the intermetallic compound, the intermetallic compound comprising:
- one or more elements of the group consisting of yttrium, cerium, praseodymium, neodymium, samarium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, lutetium and a mixture of two or more of these elements;
- and
- one or more elements of the group consisting of iron and a combination of iron with at least one transition metal;
- heating the intermetallic compound in a hydrocarbon gas to a temperature of from about 400.degree. to about 650.degree. C. at a pressure of 0.01 to 1000 bar;
- and
- incorporating carbon throughout the intermetallic compound at the interstitial sites.
Dependencies are inferred from the claim text.