CHEMICAL AND MAGNETIC ORDER IN PLATINUM-RICH PT+FE ALLOYS
CHEMICAL AND MAGNETIC ORDER IN PLATINUM-RICH PT+FE ALLOYS
复制标题
DOI：
10.1098/rspa.1963.0060
复制
发表时间：
1963-01-01
影响因子：
--
通讯作者：
CRANGLE, J
中科院分区：
文献类型：
--
作者：
BACON, GE;CRANGLE, J
中子衍射和直接磁测量已被用来确定在附近的组成Pt3Fe的铂+铁合金的磁结构。据发现，磁结构是敏感地依赖于精确的化学顺序，特别是对最近邻铁原子的数量。化学计量组成的合金，在化学顺序是完美的，有一个简单的反铁磁结构，但添加过量的铁导致两种不同的结构共存，具有不同的内尔温度，但一个单一的，未扭曲的，立方晶胞。一个初始的铁磁状态，表现出集群类型的行为与过量铁的存在。当铁含量超过34%时，体相铁磁性增强.在整个结构变化过程中，铁原子的磁矩约为3.3 μ B，铂原子的磁矩似乎很小。
Neutron-diffraction and direct magnetic measurements have been used to determine the magnetic structures of platinum + iron alloys in the neighbourhood of the composition Pt3Fe. It is found that the magnetic structure is sensitively dependent on the precise chemical order, in particular on the number of nearest-neighbour iron atoms. Alloys of the stoichiometric composition, where the chemical order is perfect, have a simple antiferromagnetic structure, but addition of excess iron leads to the coexistence of two different structures, with different Néel temperatures but a single, undistorted, cubic unit cell. An incipient ferromagnetic state which shows a cluster type of behaviour is associated with the presence of excess iron. Increase of iron content beyond 34 % leads to the growth of bulk ferromagnetism. Throughout the sequence of structural changes the iron atoms carry a magnetic moment of about 3.3 μBand there appears to be very little alined moment on the platinum atoms.