Design, synthesis and shape evaluation of cerium iron oxide nanorods for an epoxide opening reaction through azide addition
作者:Avinash A. Chaugule、Hern Kim
DOI:10.1039/c6ra19997f
日期:——
Uniform nanorod structured Ce1-xFexO2 has been synthesized through a simple urea hydrolysis method without any surfactant. The as-prepared nanorods of Ce0.75Fe0.25O2 are well clear and uniformly distributed with edge length...
Structure-Controlled Oxygen Concentration in Fe<sub>2</sub>O<sub>3</sub> and FeO<sub>2</sub>
作者:Sheng-cai Zhu、Jin Liu、Qingyang Hu、Wendy L. Mao、Yue Meng、Dongzhou Zhang、Ho-kwang Mao、Qiang Zhu
DOI:10.1021/acs.inorgchem.8b02764
日期:2019.5.6
FeO2 phase. We found the O–O bonds in FeO2 are formed by the insertion of oxygen into the Pv lattice via the external stress and such O–O bonding is only kinetically stable under high pressure. This may provide a general mechanism of adding extra oxygen to previous known O saturated oxides to produce unconventional stoichiometries. Our results also shed light on how O is enriched in mantle minerals
固-固反应,特别是在Fe-O二元体系中,由于其在化学,材料和地球科学中的各种应用,因此在过去的几十年中得到了广泛的研究。最近在高压下合成的黄铁矿-FeO 2提出了一种新颖的富氧化学计量,将可实现的铁氧化物中的O-Fe比值扩大了33%。尽管FeO 2是由Fe 2 O 3和O 2合成的,但其潜在的固体反应机理仍不清楚。在这里,结合原位X射线衍射实验和第一性原理计算,我们确定了从Fe 2 O 3开始的两个竞争相变:(1)没有O 2,钙钛矿型Fe 2 O 3转变为50 GPa以上的钙钛矿后结构;(2)如果存在游离氧,则O扩散到Fe 2 O 3的钙钛矿型晶格中,从而导致黄铁矿型FeO 2相。我们发现,FeO 2中的O–O键是通过外部应力将氧气插入Pv晶格中形成的,此类O–O键仅在高压下具有动力学稳定性。这可以提供将额外的氧添加到先前已知的O饱和氧化物中以产生非常规化学计量的一般机制。我们的结果也揭示了O在压力下如何富集于地幔矿物中。
Akhmadov; Zaslonko; Smirnov, Kinetics and Catalysis, 1988, vol. 29, # 2 pt 1, p. 251 - 257