Jang, Min-Sun Roh, Im-Jun Park, Jungmin Kang, Chong-Yun Choi, Won Jun Baek, Seung-Hyub Park, Sung Soo Yoo, Jung-Woo Lee, Ki-Suk 2024-01-20T01:02:34Z 2024-01-20T01:02:34Z 2021-09-05 2017-07-15 0925-8388 https://pubs.kist.re.kr/handle/201004/122521 We fabricated polycrystalline yttrium-iron-garnet (Y3Fe5O12, YIG) samples using the sol-gel synthesis method to develop an energy harvesting material based on the spin Seebeck effect. We confirmed that crystallization occurred during calcination at 850 degrees C and that only the polycrystalline YIG structure was formed. We found that a sintering process at 1400 degrees C not only increased the size of the YIG particles and the densification of their microstructure but also enhanced their saturation magnetization (M-s) and dramatically reduced their coercivity (H-c). A mechanical pressing process was carried out between the calcination and sintering treatments to prepare a free-standing YIG fillet sample. We found that M-s was enhanced by almost three times without an associated reduction in H-c. We found that mechanical pressing assists the oxidation reaction during the subsequent sintering process by increasing the surface energy and densification before the heat treatment. (C) 2017 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE SA YTTRIUM-IRON-GARNET SPIN DRIVEN Dramatic Dramatic enhancement of the saturation magnetization of a sol-gel synthesized Y3Fe5O12 by a mechanical pressing process Article 10.1016/j.jallcom.2017.03.313 1 JOURNAL OF ALLOYS AND COMPOUNDS, v.711, pp.693 - 697 JOURNAL OF ALLOYS AND COMPOUNDS 711 693 697 scie scopus 000401593200088 2-s2.0-85017554002 Chemistry, Physical Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Chemistry Materials Science Metallurgy & Metallurgical Engineering Article YTTRIUM-IRON-GARNET SPIN DRIVEN Sol-gel processes Oxidation Thermoelectric materials Microstructure Magnetic measurements