Magnetic properties of Sm(Co/sub bal/Fe/sub 0.31/Zr/sub 0.05/Cu/sub 0.04/B/sub x/)/sub z/ alloys and their melt-spun materials (x=0.02--0.04,z=7.5--12)
Cast alloys and melt-spun ribbons with nominal compositions of Sm(Co/sub bal/Fe/sub 0.31/Zr/sub 0.05/Cu/sub 0.04/B/sub x/)/sub z/ (x=0.02-0.04,z=7.5-12) have been synthesized and characterized in a temperature range of 10-1273 K and at fields up to 5T. The main phase in the as-cast alloys exhibited a Th/sub 2/Ni/sub 17/ type structure, with a strong uniaxial anisotropy. Minor phases with a TbCu/sub 7/ and/or CaCu/sub 5/ structure emerged as z (3d/R) decreased. As a result, the anisotropy field (H/sub A/) increased from 67 to 120 kOe, while 4/spl pi/M/sub s/ fell from 12.8 to 10.5 kG at 300 K when z was decreased from 12 to 7.5. For melt-spun ribbons, they are nano-structured in nature and magnetically hard, even in the as-spun state. By lowering the value of z(3d/R) and raising the B content, a finer microstructure and a higher H/sub ci/ were obtained. Hard magnetic properties of H/sub ci/=4.9-12 kOe, 4/spl pi/M/sub s/=9.0-12.0 kG at 300 K have been obtained from ribbon samples. Among them, Sm(Co/sub bal/Fe/sub 0.31/Zr/sub 0.05/Cu/sub 0.04/B/sub 0.02/)/sub 10/ ribbon showed the highest (BH)/sub max/ of 10.8 MGOe at 300 K. A Henkel plot analysis suggested the existence of exchange-coupling interaction between the magnetically hard and soft phases in the ribbon materials.
Magnetic Properties of Sm(Co Fe Zr Cu B ) Alloys and Their Melt-Spun Materials - -
Abstract— Cast alloys and melt-spun ribbons with nom-inal compositions of Sm(Co bal Fe 0 31 Zr 0 05 Cu 0 04 B x ) z (x = 0 02 – 0 04 z=75 – 12) have been synthesized andcharacterized in a temperature range of 10–1273 K and at fieldsup to 5T. The main phase in the as-cast alloys exhibited a Th 2 Ni 17 type structure, with a strong uniaxial anisotropy. Minor phaseswith a TbCu 7 and/or CaCu 5 structure emerged as z (3d/R)decreased. As a result, the anisotropy field ( ) increased from67 to 120 kOe, while 4 fell from 12.8 to 10.5 kG at 300 Kwhen z was decreased from 12 to 7.5. For melt-spun ribbons,they are nano-structured in nature and magnetically hard, evenin the as-spun state. By lowering the value of z (3d/R) and raisingthe B content, a finer microstructure and a higher wereobtained. Hard magnetic properties of =49 – 12 kOe, 4 =9 0 – 12 0 kG at 300 K have been obtained from ribbonsamples. Among them, Sm(Co bal Fe 0 31 Zr 0 05 Cu 0 04 B 0 02 ) 10 ribbon showed the highest ( ) max of 10.8 MGOe at 300 K. AHenkel plot analysis suggested the existence of exchange-couplinginteraction between the magnetically hard and soft phases in theribbon materials.
The effect of family size on parents' labor supply and occupational prestige: Evidence from Taiwan and Mainland China
Abstract This paper studies the effect of family size on parents' labor supply and occupational prestige, using the censuses of both Taiwan and Mainland China. We rely on the exogenous increase in child quantity that results from having twins at the first birth. Our results indicate that an increase in family size has negative effects on the labor supply of mothers, but not of fathers, in both Taiwan and Mainland China. In addition, we find that in Taiwan fathers tend to switch to occupations with lower prestige scores in response to an increase in family size. However, the negative effect of family size on occupational prestige is not observed in Mainland China, where the occupational mobility is low.