magnetic material

Abstract

There is disclosed a magnetic material having a composition in atomic percentage of: (MM 1-a R a ) u Fe 100-u-v-w-x-y Y v M w T x B y wherein MM is a mischmetal or a synthetic equivalent thereof; R is Nd, Pr or a combination thereof; Y is a transition metal other than Fe; M is one or more of a metal selected from Groups 4 to 6 of the periodic table; and T is one or more of a metal other than B, selected from Groups 11 to 14 of the periodic table, wherein 0≦a≦1, 7≦u≦13, 0≦v≦20, 0≦w≦5; 0≦x≦5 and 4≦y≦12.

1 . A magnetic material having a composition in atomic percentage of:
   (MM 1-a R a ) u Fe 100-u-v-w-x-y Y v M w T x B y      wherein   MM is a naturally occurring mischmetal comprised of Nd, Pr, Ce and La;
 R is Nd, Pr or a combination thereof; 
 Y is a transition metal other than Fe; 
   M is one or more of a metal selected from Groups 4 to 6 of the periodic table; and   T is one or more of a metal other than B, selected from Groups 11 to 14 of the periodic table,   wherein 0≦a<1, 7≦u≦13, 0≦v≦20, 0≦w≦5; 0≦x≦5 and 4≦y≦12.   
     
     
         2 . A magnetic material as claimed in  claim 1 , wherein the mischmetal is a cerium-based mischmetal. 
     
     
         3 . A magnetic material as claimed in  claim 1 , wherein said mischmetal has the following composition in weight percent:
 20% to 30% La;   2% to 8% Pr;   10% to 20% Nd; and   the remainder being Ce and any incidental impurities.   
     
     
         4 . A magnetic material as claimed in  claim 3 , wherein said mischmetal has the following composition in weight percent:
 25% to 27% La;   4% to 6% Pr;   14% to 16% Nd; and   47% to 51% Ce.   
     
     
         5 . A magnetic material as claimed in  claim 1  wherein the transition metal Y is selected from Group 9 or Group 10 of the periodic table. 
     
     
         6 . A magnetic material as claimed in  claim 5  wherein the transition metal Y is Co. 
     
     
         7 . A magnetic material as claimed in  claim 1  wherein the metal M is one or more of Zr, Nb, Ti, Cr, V, Mo, W, and Hf. 
     
     
         8 . A magnetic material as claimed in  claim 1  wherein the T is one or more of Al, Mn, Cu and Si. 
     
     
         9 . A magnetic material as claimed in  claim 1 , wherein M is Zr, Nb, or a combination thereof and T is Al, Mn, or a combination thereof. 
     
     
         10 . A magnetic material as claimed in  claim 9 , wherein M is Zr and T is Al. 
     
     
         11 . A magnetic material as claimed in  claim 1 , wherein 0.2≦a≦0.8, 8≦u≦13, 0≦v≦15, 0.1≦w≦4, 1≦x≦5, and 4≦y≦11. 
     
     
         12 . A magnetic material as claimed in  claim 11 , wherein 0.4≦a≦0.8, 10≦u≦13, 0≦v≦10, 0.1≦w≦3, 2≦x≦5, and 4≦y≦10. 
     
     
         13 . A magnetic material as claimed in  claim 12 , wherein 0.5≦a≦0.75, 11≦u≦12, 0≦v≦5, 0.2≦w≦2, 2.5≦x≦4.5, and 5≦y≦6.5. 
     
     
         14 . A magnetic material as claimed in  claim 13 , wherein 0.55≦a≦0.7, 11.3≦u≦11.7, 0≦v≦2.5, 0.3≦w≦1, 3≦x≦4, and 5.7≦y≦6.1. 
     
     
         15 . A magnetic material as claimed in  claim 1 , wherein 0.9≦a≦0.99 and 0.1≦x≦1. 
     
     
         16 . A magnetic material as claimed in  claim 15 , wherein 8≦u≦13, 0≦v≦15, 0.1≦w≦4, 1≦x≦5, 4≦y≦11 and a=0. 
     
     
         17 . A magnetic material as claimed in  claim 16 , wherein 10≦u≦13, 0≦v≦10, 0.1≦w≦3, 2≦x≦5, 4≦y≦10 and a=0. 
     
     
         18 . A magnetic material as claimed in  claim 17 , wherein 11≦u≦12, 0≦v≦5, 0.2≦w≦2, 2.5≦x≦4.5, 5≦y≦6.5 and a=0. 
     
     
         19 . A magnetic material as claimed in  claim 18 , wherein 11.3≦u≦11.7, 0≦v≦2.5, 0.3≦w≦1, 3≦x≦4, 5.7≦y≦6.1 and a=0. 
     
     
         20 . A magnetic material as claimed in  claim 1 , wherein 0.1≦x≦1 and a=0. 
     
     
         21 .- 37 . (canceled)