论文标题
Al $ _x $ fe $ _ {2-x} $ geo $ _5 $的磁性
Magnetism of Al$_x$Fe$_{2-x}$GeO$_5$ with Andalusite Structure
论文作者
论文摘要
Al $ _x $ fe $ _ {2-x} $ geo $ _5 $的磁性从$ x $ = 0.09到$ x $ = 0.91，并检查了Andalusite结构。 Al $ _x $ fe $ _ {2-x} $ geo $ _5 $在低温下的磁性属性是薄弱的类似铁电磁的状态，$ x $ $ <$ <$ <$ <$ <$ <$ <$ <$ x $ $> $> $> $> $ 0.3。在弱铁磁样相中出现的小型自发性磁化将是由于存在Dzyaloshinsky-Moriya相互作用，或者是由于八面体和三边形双层型位点在Fe $^{3+} $中的磁矩幅度的差异所致。旋转玻璃相的外观表明，Al离子在Al $ _X $ _x $ fe $ _ {2-x} $ geo $ _5 $中稀释的稀释离子会导致铁磁相互作用和反铁磁相互作用之间的竞争。 Fe离子的网站占用的$ x $依赖性表明，无法综合使用Andalusite结构的Fe $ _2 $ geo $ _5 $。
The magnetism of Al$_x$Fe$_{2-x}$GeO$_5$ from $x$ = 0.09 to $x$ = 0.91 with andalusite structure was examined. The magnetic properties of Al$_x$Fe$_{2-x}$GeO$_5$ at low temperatures were found to be weak ferromagnetic-like state for $x$ $<$ 0.3 and spin-glass state for $x$ $>$ 0.3. The small spontaneous magnetization that appears in the weak ferromagnetic-like phase would be due to the presence of Dzyaloshinsky-Moriya interaction or to the difference in the magnitude of the magnetic moment of Fe$^{3+}$ in the octahedral and trigonal bipyramidal sites. The appearance of the spin-glass phase indicates that the dilution of Fe ions by Al ions in Al$_x$Fe$_{2-x}$GeO$_5$ causes the competition between ferromagnetic and antiferromagnetic interactions. The $x$ dependence of the site occupancy of Fe ions suggests that Fe$_2$GeO$_5$ with andalusite structure cannot be synthesized.
