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本文研究了Pr_2(Co_(1-x)Mn_x)_(14)B 和 Pr_2(Fe_(1-x)Mn_x)14B 化合物的晶体结构和低温内禀磁性.在 x≤0.5时,可以形成2-14-1四方晶体结构.当 x 分别大于0.3和0.2时,Pr_2(Co_(1-x)Mn_x)_(14)B 和 Pr_2(Fe_(1-x)Mn_x)_(14)B 的居里温度 T_c 和饱和磁化强度σ_s 急剧减小.这两种化合物块状样品在1.5 K 的内禀矫顽力分别达到16 kOe 和22 kOe.内禀矫顽力既随成分变化,也随温度改变.低温特大矫顽力来源于窄畴壁能的涨落. 相似文献
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葛森林 《北京邮电大学学报》1991,(4)
采用热处理的方法,使氮原子进入到 RTiFe_(11)(R=Y,Nd,Sm)的结构中去.利用 x 射线衍射和磁测量研究了 RTiFe_(11)N_x 的晶体结构和内禀磁性.x 射线衍射表明 RTiFe_(11)N_x 仍保持 RTiFe_(11)的四方结构(I4/mmm).氮原子的加入使晶胞体织增大,Curie 温度升高,改变了磁晶各向异性.在 RTiFe_(11)N_x 化合物中,NdTiFe_(11)N_x的饱和磁化强度高,Curie 温度高,有高单轴磁晶各向异性.这些效应使 NdTiFe_(11)N_x具备了研制高矫顽力永磁体的潜力. 相似文献
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We succeed in inserting a number of nitrogen atoms into the R_2Fe_(17)and RTiFe_(11)intermetalliccompounds.The nitrides retain original Th_2Zn_(17)(or Th_2Ni_(17_)and ThMn_(12)structures,but with an increase inthe unit cell volume.The interstitial nitrogen atoms are found to have an effect of increasing the Curie tempera-ture and saturation magnetization.Moreover,a distinct effect on the magnetocrystalline anisotropy is also ob-served in these nitride compounds.Especially,NdTiFe_(11)N_(0.5)and SmTiFe_(11)N_2 have excellent intrinsic magneticproperties favourable for permanent magnet applications. 相似文献
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The carbon and nitrogen atoms can be introduced into the R_2Fe_(17) structure by a proper heat treatment.The crystallographic and intrinsic magnetic properties of a series of R_2Fe_(17)CN_x,where R=Y,Sm,Gd,Tb,Dy,Er have been investigated by using X-ray diffraction technique and magnetic measurements.The interstitial car-bon and nitrogen atoms are found to have an effect of dilating unit cell volume,raising Curie temperature andsaturation magnetization,as well as enhancing uniaxial magnetocrystalline anisotropy. 相似文献
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通过控制合金热处理条件、 氮化温度与时间和氮化前后颗粒尺寸的大小, 成功的制备了高性能的各向异性NdFe10.5V1.5Nx磁粉.其磁性能为Br=1.08 T, Hcj=342 kA/m, (BH)max= 137 kJ/m3,Tc>820 K.对氮含量与晶体结构和内禀磁性的关系研究表明: 氮含量对制备高性能的氮化物磁粉是至关重要的.与快淬NdFeB相比, NdFe10.5V1.5Nx磁粉具有高磁能积和低价格的优点, 是一种永磁材料. 相似文献
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