磁铁矿
充电顺序
拉曼光谱
尖晶石
兴奋剂
掺杂剂
八面体
材料科学
杂质
结晶学
无机化学
化学
晶体结构
电荷(物理)
冶金
物理
有机化学
光电子学
光学
量子力学
作者
L. V. Gasparov,A.A. Rush,T. M. Pekarek,Nirmal Patel,H. Berger
摘要
The nature of the Verwey transition in magnetite (Fe3O4) remains an unsolved puzzle after more than 60 years. Impurities and dopants present in magnetite can alter the Verwey transition temperature Tv as well as other physical characteristics of magnetite. We present the results from Raman studies of Mn-, Ni-, and Al-doped magnetites with Verwey transition temperatures ranging from 115 to 123 K. Mn and Ni substitute only in the octahedral sites of magnetite’s spinel structure, while Al has been shown to occupy both octahedral and tetrahedral sites. We analyze the shifts in the Raman spectra of our samples relative to stoichiometric and oxygen deficient magnetite. Substitution sites and concentration of dopants will be discussed. In particular we discuss changes in the A1g 668 cm−1 and T2g 538 cm−1 modes due to doping.
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