This study examines the effect of substituted concentration on the structure and magnetic properties of Y3Fe5-xInxO12 (x = ÷ ) powder samples prepared using the sol-gel method. The morphological properties of the samples were analysed using XRD, SEM. The single phase of garnet was obtained in x = ÷ samples. | VNU Journal of Science: Mathematics – Physics, Vol. 34, No. 4 (2018) 28-34 Effect of Substituted Concentration on Structure and Magnetic Properties of Y3Fe5-xInxO12 Vu Thi Hoai Huong, Dao Thi Thuy Nguyet, Nguyen Phuc Duong* ITIMS, Hanoi University of Science and Technology, No. 1, Dai Co Viet, Hai Ba Trung, Hanoi, Vietnam Received 09 November 2018 Revised 18 December 2018; Accepted 18 December 2018 Abstract: This study examines the effect of substituted concentration on the structure and magnetic properties of Y3Fe5-xInxO12 (x = ÷ ) powder samples prepared using the sol-gel method. The morphological properties of the samples were analysed using XRD, SEM. The single phase of garnet was obtained in x = ÷ samples. The lattice parameters of the samples exhibit a linear increase with the increasing In3+ content, which can be explained by a substitution of In3+ ions for Fe3+ ions, considering the larger ionic radius of In3+ compared with that of Fe3+. Crystallite sizes were determined via the XRD data which are of 38 – 49 nm while the particle sizes were estimated from SEM images to be in range of 50 - 100 nm. Magnetization and Curie temperature of the single phase samples were studied by magnetization curves in fields up to 10 kOe and in the temperature range from 80 K to 560K. With the increase of In3+, the magnetization gradually increases while the Curie temperature decreases due to the occupation of In atoms at the a sites and the reduction of intersublattice interaction, respectively. Keywords: Yttrium iron garnet, Indium substitution, cation distribution, magnetization, Curie temperature. 1. Introduction Yttrium ferrite garnet Y3Fe5O12 (YIG) is known as one of the most important garnets for microwave applications. It is material that widely used in microwave devices, transformers, electric generators, bioprocessing, and storage devices [1-7] because of its combine good high-frequency dielectric properties with a ferrimagnetic order. YIG has .
