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Spectroscopic investigations and magnetic measurements on iron-containing barium titanate glass-ceramics
Journal of Non-Crystalline Solids ( IF 3.2 ) Pub Date : 2020-07-09 , DOI: 10.1016/j.jnoncrysol.2020.120273
Ruzha Harizanova , Ivalina Avramova , Zara Cherkezova-Zheleva , Daniela Paneva , Rositsa Kukeva , Radostina Stoyanova , Ivailo Gugov , Irena Mihailova , Dimitar Tzankov , Milena Georgieva , Georgi Avdeev , Christian Bocker , Christian Rüssel

Glass-ceramics with cubic BaTiO3 as a major and hexagonal BaTi1-xFexO3-δ as a second phase were prepared by crystallization at 560°C in a glass with the composition 20.1Na2O/23TiO2/23.1BaO/3Al2O3/7.6B2O3/17.4SiO2/5.8Fe2O3. X-ray photoelectron spectroscopy revealed presence of Ti4+ and Fe3+ ions in tetrahedral and octahedral coordination. Ba2+ occurs in different environments depending on the thermal history of the samples. The numbers of bridging and non-bridging oxygens vary with the crystallization time. Electron paramagnetic resonance spectroscopy showed four types of Fe3+ ions that are non-uniformly distributed in the samples: Fe3+ ions in magnetic domains, isolated Fe3+ in a rhombic crystal field, magnetically coupled Fe3+ ions in BaTiO3 and Fe3+ ions located in a crystalline phase. The ratio between the described types of Fe3+ ions depends on the annealing time. Mössbauer spectroscopy detected Fe3+ tetrahedral and octahedral coordinated in the glass. Fe3+ was incorporated in distorted octahedral and pentahedral coordination in the Ti4+ sites of hexagonal BaTiO3 crystals, the electroneutrality being preserved by the occurrence of oxygen vacancies. Vibrating sample magnetometer measurements were used to determine ferromagnetic properties in samples crystallized for times ≥ 3 h. Maximum magnetization of 0.8 emu/g and a coercive force of 25 Oe were determined for the sample crystallized for 3 h at 560°C.



中文翻译:

含铁钛酸钡玻璃陶瓷的光谱学研究和磁测量

在560 结晶,制备了以立方BaTiO 3为主要成分和六方BaTi 1-x Fe x O3 为第二相的玻璃陶瓷。组成为20.1Na 2 O / 23TiO 2 /23.1BaO/3Al 2 O 3 /7.6B 2 O 3 /17.4SiO 2 /5.8Fe 2 O 3的玻璃中的℃ 。X射线光电子能谱显示四面体和八面体配位存在Ti 4+和Fe 3+离子。根据样品的热历史,Ba 2+会在不同的环境中发生。桥接氧和非桥接氧的数目随结晶时间而变化。电子顺磁共振光谱显示出四种类型的Fe 3+样品中分布不均匀的离子:磁畴中的Fe 3+离子,菱形晶场中的孤立Fe 3 +,BaTiO 3中的磁耦合Fe 3+离子和位于晶相中的Fe 3+离子。所述类型的Fe 3+离子之间的比例取决于退火时间。穆斯堡尔光谱法检测到玻璃中配位的Fe 3+四面体和八面体。铁3+在八面体和五面体协调纳入钛4+六方钛酸钡的网站3晶体,电子中性被氧空位的出现所保留。振动样品磁力计测量用于确定结晶≥3小时的样品中的铁磁性能。在560℃结晶3小时的样品的最大磁化强度为0.8 emu / g,矫顽力为25 Oe℃。

更新日期:2020-07-09
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