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Facile and Low-Temperature Synthesis of γ-Fe2O3 Nanoparticles with Thermally Stable Ferrimagnetism for Use in Magnetic Recording Tapes
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-09-25 , DOI: 10.1021/acsanm.0c01904 Takeshi Uyama 1 , Kazuhiko Mukai 1 , Ikuya Yamada 2
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-09-25 , DOI: 10.1021/acsanm.0c01904 Takeshi Uyama 1 , Kazuhiko Mukai 1 , Ikuya Yamada 2
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Maghemite, γ-Fe2O3, has regained importance as a magnetic tape storage material for the big data era due to its low cost and long-term durability. However, the conventional synthesis of γ-Fe2O3, which involves dehydration, reduction, and oxidation processes, is complicated and requires improvement. We synthesized γ-Fe2O3 directly via dehydration from the high-pressure phase of iron hydroxide, ϵ-FeOOH, using a low-temperature solution method. Bulk ϵ-FeOOH prepared from α-FeOOH at 8.2 GPa and 773 K transformed into γ-Fe2O3 in a 2-phenoxyethanol and LiOH·H2O mixture at 498 K, which is the lowest temperature among similar dehydration reactions. 57Fe Mössbauer, Raman, and Fourier transform infrared spectroscopy analyses revealed that the obtained γ-Fe2O3 particles were covered with amorphous lithium phases, which stabilized their ferrimagnetism with a magnetization of 61.9 emu g–1 up to 1273 K, by converting to ferrimagnetic Li0.5Fe2.5O4. Furthermore, we reduced the size of γ-Fe2O3 to an average of 0.5 μm and a minimum of approximately 100 nm by applying ϵ-FeOOH nanoparticles as a precursor, which were prepared under higher-pressure (10 GPa) and lower-temperature (673 K) conditions. Although synchrotron X-ray diffraction measurements found that the γ-Fe2O3 nanoparticles were contaminated with ion-exchanged α-LiFeO2 at 80 wt %, a facile and low-temperature method to synthesize γ-Fe2O3 was established.
中文翻译：
容易和低温合成了γ-Fe 2 ö 3纳米颗粒与热稳定亚铁磁性的使用在磁性记录带
磁赤铁矿，γ-的Fe 2 ö 3，已经恢复的重要性作为大数据时代磁带存储材料，由于其成本低，长期耐久性。然而，γ-Fe的常规合成2 ö 3，其涉及脱水，还原和氧化过程，是复杂的，并且需要改进。我们合成了γ-Fe 2 ö 3通过从氢氧化铁，ε-的FeOOH的高压阶段脱水直接，使用低温溶液方法。散装ε-的FeOOH从α-的FeOOH制备在8.2 GPA和773ķ转化为γ-的Fe 2 ö 3在2-苯氧基乙醇和LiOH·H 2O混合物在498 K，这是类似脱水反应中的最低温度。57铁穆斯堡尔，拉曼和傅里叶变换红外光谱法分析表明，所得到的γ-的Fe 2个ö 3颗粒覆盖有非晶锂相，其稳定了亚铁磁性与61.9鸸鹋g的磁化-1到1273 K，通过转换铁磁Li 0.5 Fe 2.5 O 4。此外，我们减小的尺寸了γ-Fe 2 ö 3通过在较高压力（10 GPa）和较低温度（673 K）的条件下应用γ-FeOOH纳米粒子作为前驱体，可将平均粒径降至0.5μm，最小约为100 nm。尽管同步加速器X射线衍射测定发现了γ-Fe 2个ö 3纳米颗粒污染用离子交换α-LiFeO 2，在80重量％时，容易和低温方法合成了γ-Fe 2 ö 3成立。
更新日期：2020-11-25
中文翻译：
容易和低温合成了γ-Fe 2 ö 3纳米颗粒与热稳定亚铁磁性的使用在磁性记录带
磁赤铁矿，γ-的Fe 2 ö 3，已经恢复的重要性作为大数据时代磁带存储材料，由于其成本低，长期耐久性。然而，γ-Fe的常规合成2 ö 3，其涉及脱水，还原和氧化过程，是复杂的，并且需要改进。我们合成了γ-Fe 2 ö 3通过从氢氧化铁，ε-的FeOOH的高压阶段脱水直接，使用低温溶液方法。散装ε-的FeOOH从α-的FeOOH制备在8.2 GPA和773ķ转化为γ-的Fe 2 ö 3在2-苯氧基乙醇和LiOH·H 2O混合物在498 K，这是类似脱水反应中的最低温度。57铁穆斯堡尔，拉曼和傅里叶变换红外光谱法分析表明，所得到的γ-的Fe 2个ö 3颗粒覆盖有非晶锂相，其稳定了亚铁磁性与61.9鸸鹋g的磁化-1到1273 K，通过转换铁磁Li 0.5 Fe 2.5 O 4。此外，我们减小的尺寸了γ-Fe 2 ö 3通过在较高压力（10 GPa）和较低温度（673 K）的条件下应用γ-FeOOH纳米粒子作为前驱体，可将平均粒径降至0.5μm，最小约为100 nm。尽管同步加速器X射线衍射测定发现了γ-Fe 2个ö 3纳米颗粒污染用离子交换α-LiFeO 2，在80重量％时，容易和低温方法合成了γ-Fe 2 ö 3成立。
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