Coercivity and packing density in acicular particles
Coercivity and packing density in acicular particles
复制标题
针状颗粒的矫顽力和堆积密度
DOI：
10.1016/0304-8853(81)90153-0
复制
发表时间：
1981
影响因子：
2.7
通讯作者：
J. Knowles
中科院分区：
文献类型：
--
作者：
J. Knowles
将排列或随机取向的粒子作为自由极点的集合考虑，表明剩磁矫顽力与堆积密度p之间的关系为：hr (p)= hr (0)[1-C (M s/H r (0)) 2 p 4/3]，其中hr(0)为孤立粒子，C为常数。这个表达式被发现非常适合于已发表的数据，无论是“磁带”氧化物还是ESD永磁材料的排列或随机定向颗粒。这个方程的推导需要做一些简化的假设，其中一些假设通过计算机模拟得到hr (p)来避免。在不调用任何任意参数的情况下，这些曲线与已发表的γ- fe2o3数据和（p< 0.25） ESD永磁体的数据一致。
Consideration of a compact of aligned or randomly orientated particles as an assembly of free poles, suggested that the relationship between the remanence coercivity and the packing density p is: H r (p)= H r (0)[1-C (M s/H r (0)) 2 p 4/3], where H r (0) refers to isolated particles, and C is a constant. This expression was found to give very good fits to published data, both for aligned or randomly orientated particles of either ‘tape’oxides, or ESD permanent magnet materials. The derivation of this equation involved making a number of simplifying assumptions, some of which were avoided by using computer simulations to obtain H r (p). Without invoking any arbitrary parameters, these yielded curves which agreed with published data for γ-Fe 2 O 3 and (forp< 0.25) for ESD permanent magnet compacts.