Detailed crystallization study of co-precipitated Y1.47Gd1.53Fe5O12 and relevant magnetic properties

Rogério Arving Serra, Tsuneharu Ogasawara, Angélica Soares Ogasawara
2007 Química Nova  
Recebido em 6/6/06; aceito em 15/3/07; publicado na web em 30/7/07 The crystallization process of co-precipitated Y 1.5 Gd 1.5 Fe 5 O 12 powder heated up to 1000 o C at rate of 5 °C min -1 was investigated. Above 810 o C crystalline Y 1.47 Gd 1.53 Fe 5 O 12 was obtained with a lattice parameter of 12.41 Å and a theoretical density of 5.84 g cm -3 . Dry pressed rings were sintered at 1270 and 1320 o C, increasing the grain-size from 3.1 to 6.5 μm, the theoretical density by 87.6 to 95.3% and
more » ... .6 to 95.3% and decreasing H c from 2.9725 to 1.4005 Oe. Additionally, H c increased when the frequency of the hysteresis graph varied from 60 Hz to 10 kHz, the curie temperature was 282.4 o C and M s equalled 9.25 emu g -1 (0.17 kG) agreeing well with the B s -value of the hysteresis graph and literature values.
doi:10.1590/s0100-40422007000700009 fatcat:ynuddbd4nfg57ereb5kgd7s5lq