Glass–crystalline materials with high iron oxide concentration: Phase composition, redox ratio and magnetic properties

IF 2.7 4区材料科学 Q1 MATERIALS SCIENCE, CERAMICS Boletin de la Sociedad Espanola de Ceramica y Vidrio Pub Date : 2024-01-01 DOI:10.1016/j.bsecv.2023.04.001

Ruzha Harizanova , Irena Mihailova , Zara Cherkezova-Zheleva , Daniela Paneva , Milena Georgieva , Dimitar Tzankov , Georgi Avdeev , Christian Rüssel

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Abstract

The synthesis of glass–crystalline materials in the system Na₂O/CaO/SiO₂/Fe₂O₃ with high concentrations of Fe₂O₃ (20, 25 and 30 mol%) by applying the melt-quenching technique is reported. The melts spontaneously crystallize during pouring and the formation of magnetite (Fe₃O₄), hematite (α-Fe₂O₃) and ɛ-Fe₂O₃, as identified by X-ray diffraction (XRD) is observed. The microstructure and the elemental composition of the prepared materials are further investigated by scanning electron microscopy (SEM) and two different morphological types of Fe-containing crystals – needle-like and dendrite-shaped are detected. Mössbauer spectroscopy showed the presence of Fe³⁺ and Fe²⁺, as well as the existence of iron ions both in tetrahedral and octahedral coordination and the precipitation of hematite, ɛ-Fe₂O₃ and magnetite. The magnetic measurements on the prepared samples reveal ferrimagnetic properties with well defined hysteresis curves, although due to relatively small volume fraction of the iron-rich crystalline phases, the net magnetic moment is quite low compared to the bulk values for magnetite.

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高浓度氧化铁的玻璃晶体材料：相组成、氧化还原比率和磁性能

报告采用熔体淬火技术在高浓度 Fe2O3（20、25 和 30 mol%）的 Na2O/CaO/SiO2/Fe2O3 体系中合成了玻璃晶体材料。经 X 射线衍射 (XRD) 鉴定，观察到熔体在浇注过程中自发结晶，并形成磁铁矿（Fe3O4）、赤铁矿（α-Fe2O3）和ɛ-Fe2O3。扫描电子显微镜（SEM）进一步研究了制备材料的微观结构和元素组成，发现了两种不同形态的含铁晶体--针状和树枝状。摩斯鲍尔光谱显示存在 Fe3+ 和 Fe2+，以及四面体和八面体配位的铁离子，并析出赤铁矿、ɛ-Fe2O3 和磁铁矿。对制备的样品进行的磁性测量显示了具有明确磁滞曲线的铁磁特性，尽管由于富铁结晶相的体积分数相对较小，净磁矩与磁铁矿的体积值相比相当低。

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来源期刊

Boletin de la Sociedad Espanola de Ceramica y Vidrio 工程技术-材料科学：硅酸盐

CiteScore

5.50

自引率

2.90%

发文量

审稿时长

103 days

期刊介绍： The Journal of the Spanish Ceramic and Glass Society publishes scientific articles and communications describing original research and reviews relating to ceramic materials and glasses. The main interests are on novel generic science and technology establishing the relationships between synthesis, processing microstructure and properties of materials. Papers may deal with ceramics and glasses included in any of the conventional categories: structural, functional, traditional, composites and cultural heritage. The main objective of the Journal of the Spanish Ceramic and Glass Society is to sustain a high standard research quality by means of appropriate reviewing procedures.