maghemite

Also , X-ray diffraction studies indicate that the hematite contents in fine-earth fraction and clay fraction rise with increase in soil-forming age and that magnetite descends while maghemite ascends in content .

X-射线衍射结果表明土壤细土和黏粒中赤铁矿含量与风化成土时间呈正比增加。同时，土壤有磁铁矿含量减少、磁赤铁矿增加的趋势。

In particular , the maghemite distributes mainly in the oil and gas bearing layer with the intermediate magnetic intensity . But the magnetite with the iron contents of 12.5 % distributes mainly in the dry layer at the bottom .

其中磁赤铁矿主要分布在具有中等磁性强度的油气显示层，而高含量（最高含量达12.5%）的磁铁矿主要位于底部干层。

Anionic maghemite nanoparticles allow labeling of a wide cell variety and their recognition in cellular , organo typical , and animal models .

阴离子磁赤铁矿纳米颗粒能够标记多种细胞，并用于细胞、器官和动物模型的识别。

The nucleation , growth and self-assembly of rice-like maghemite nanocrystals have been investigated under the induction of applied magnetic fields .

研究了0.2&0.4T外磁场诱导下新颖的多磁畴的磁赤铁矿核桃球超结构（由米粒形基本粒子构成）的成核、生长及自组装行为。

The good positive correlation between magnetic susceptibility and red beds suggest that the magnetic susceptibility changes due to the variety of the hematite or maghemite composition .

磁化率与红层成良好的正相关关系，说明铁氧化物矿物含量的变化是导致磁化率变化的原因。

Maghemite is directly prepared by pyrolysis of ferrous hydroxide as precursors in the presence of CO2-3 with microwave irradiation .

用硫酸亚铁为原料加NH3·H2O得到的Fe（OH）2作前驱物，在有CO32-存在下进行微波快速热解可直接得到γ-Fe2O3。

It is indicated that some of maghemite resulted from the combusted powders react with barium carbonate forming into barium ferrite , while the others convert into hematite .

复合粉末相转变过程研究表明：前驱体干凝胶自蔓延反应后的γ-氧化铁一部分与碳酸钡反应生成六角晶钡铁氧体，另一部分则转换为α-氧化铁。

The correlations in contents between maghemite and hematite and between pyrite and siderite indicate that the authigenous maghemite may have originated largely from the autochthonous hematite and pyrite .

磁赤铁矿与赤铁矿、黄铁矿及菱铁矿含量之间相关特征初步表明，自生磁赤铁矿可能主要来源于原地赤铁矿与黄铁矿。

The result shows that in the presence of a 0.4 T magnetic field , the interaction between magnetic dipole and the magnetic field is now stronger than the surface interaction between the rice-like maghemite nanocrystals , preventing the formation of walnut superstructures .

表明磁场强度达0.4T时，磁场与米粒形基本粒子之间的相互作用力要大于粒子之间的表面相互作用，阻止了核桃球形超结构的形成。

This may be explained when the climate was extremely dry , no magnetite / maghemite at all has been formed in the soil , and a precipitation threshold has to be crossed before the magnetic susceptibility starts to register the summer monsoon changes .

在极端冷期降雨量和平均温度低于某个阈值的时候，虽然夏季风强度存在变化，但不足以影响磁铁矿和磁赤铁矿的形成，所以那时磁化率的变化不能很好地记录夏季风气候变化。

In this paper , the abstraction and analysis process of iron oxide minerals from soils developed on carbonate rock are designed , high gradient maghemite grains are successfully obtained , and systematic studies are made of the iron oxide minerals by using mineralogical methods to probe into their genesis .

设计了土壤中氧化铁矿物提取方法和分析流程，成功地从碳酸盐岩发育土壤中提取到较纯的磁赤铁矿微结核，运用多种矿物学方法进行了较系统的矿物学研究，并探讨了其成因机理。