X線ディフラクトメーターによる磁硫鉄鉱の化学組成-結晶構造-磁性の関係の研究

磁硫鉄鉱の特性について (第5報)

抄録

In this report the writers describe the results of their X-ray study of Pyrrhotite, investigated withthe “Norelco” X-ray diffractometer.
The main results obtained are as follows:
(1) X-ray profiles:
a) Employing the X-ray diffractometer, the writers obtained detailed X-ray diagrams of pyrrhotite which would not be expected by the powder photographic method.
b) It was confirmed that the (102) diffraction peak breaks up into two peaks, when the crystal changes into ferromagnetic state from paramagnetic one.
c) The specimen with a similar chemical composition to the artificial pyrrhotite showed. almost the same α values.
(2) Relation between chemical composition, crystal strutucre and magnetism
a) The vacant Fe atoms in pyrrhotite crystal vary the chemical composition and decrease. the crystal symmetry too. Consequently the (102) diffraction peak breaks up and the occurs.
b) The point where both (102) _a, and (102) _b peaks indicate the same diffraction-intensity may be considered as the lithit of a, single phase of. pyrrhotite. At this point pyrrhotite shows. the strongest magnetism. If Fe atoms further decrease a new phase of pyrite grows up in pyrrhotite, crystal.
c) It was Proved by measurement of the susceptibility-temperature curves that the specimens showing the break-up of the (102) diffraction peak are magneticaly homogeneous each other.