The structure of the gahnite samples was refined by the Rietveld method, simultaneously with the analysis of diffraction line broadening. Valence state and the location of manganese ions in the structure were determined by EPR spectroscopy. Pure gahnite possessed the normal spinel structure, while Mn...
structure (solids and liquids)manganese, Mnzinc, Znaluminum, AlMn-doped ZnAl2O4 with 0, 4.3, 7.6, and 11.7 at.% Mn (substituted for Zn) is synthesized by a sol—gel process starting with a mixture of Al(O-sBu)3, Zn(NO3)2, Mn(NO3)2 dissolved in sBuOH (calcination in air, 800...
the velocity and limitation of Co2+ entry into the spinel structure were studied under the condition of Co/Fe ratio in initial solution.从实际应用的角度出发,研究了初始溶液中钴铁摩尔比对室温下Co2+进入尖晶石结构的速率和程度的影响,过程中的氧化-还原电位和产物的化学分析、XRD以及IR等光谱分析的结果...
X-ray diffraction (XRD) spectra show that Zn0.9Cu x Mn2.1-x O\\intered at 1100 °C crystallizes in a tetrahedral spinel structure, which is caused by the Jahn-Teller effect of the Mn3+ ions at the B sites. Cu2p3/2 X-ray photoelectron spectra (XPS) demonstrate that most of Cu ...
2a. When the temperature was increased to ∼500 °C, the characteristic peaks of Mn2O3 were detected in the XRD patterns, indicating MnO2 begin to convert to Mn2O3 and O2. At ∼500 °C, the (220) peak of spinel structure was first observed, and from 500 to 1000 °C, spinel-(...
peaks and cannot recover even if the cell is charged back to 3.0 V (not shown here). This structural evolution is consistent with previous reports that the spinel structure changes into rock salt nanocrystals at low voltage and cannot be detected by XRD34. Fig.1bshows a series of Raman ...
Field emission scanning electron microscopy (FESEM and transmission electron microscopy (TEM), X‐ray diffraction (XRD), X‐ray photoelectron spectroscopy (XPS) and Raman spectroscopy confirmed the formation of nanocrystalline zinc‐ferrite powder with a mixed spinel structure with small amounts of ...
Several analytical techniques were employed to confirm the structure, such as X-ray diffraction (XRD), and X-ray photon spectroscopy (XPS). The spinel oxide distribution and surface morphology were studied using scanning electron microscopy (SEM), and transmitted electron microscopy (TEM). The ...
Many of those unique properties are directly dependent on the transport properties, which in turn are closely correlated with the defect structure of the compound. Therefore, understanding of the type and extent of the ionic disorder is of a high importance from the materials engineering point of ...
Fig. 1. (a, b) The measured XRD and crystal structure of LaFe2O4 and Rietveld refinement of the measured XRD data using Prof−Suit software to verify the experimental data; (c, d) Crystal structure planes and selected area electron diffraction (SAED) pattern of LaFe2O4 powders obtained...