The initial magnetic susceptibilities of Gd3Fe5O12 and Tb3Fe5O12 in the compensation point region

First-principles study of magnon-phonon interactions in gadolinium iron garnet

“…5(a). The crossing point of the total magnetization curve (black) and the horizontal dash line shows that T comp (310 K) and T C (550 K), which are in good agreement with the experimental values of 290 K 16,17 and 560 K 5,54 , respectively. Through the Fig.…”

Terbium–yttrium–iron garnet revisited

“…2(a)) shows the formation of some orthorhombic YIG, but this calcination temperature was not enough to generate mixed terbium-yttrium-iron garnet (TbYIG); thus, sintering must be done at higher temperatures and/or for longer time durations [27]. Rodic et al [21], for instance, used 6 h presintering at 1127 • C for GdIG and TbIG, while Sztaniszlav et al [28] pre-sintered an yttria-hematite mixture for 3-12 h in air at 800-1400 • C to obtain YIG and found a maximum predominance of YFeO 3 at 1100 • C, while YIG formed only above 1300 • C; Ings et al [29], got success at 1300 • C. Hong et al [25] achieved lattice constant equal to 12.4364Å for TbIG synthesized by using citrate process, in which the dried gel powder was ground and annealed at 1400 • C for 3 h in air. The VSM measurements were performed in the 30-700 K temperature range, covering both the Néel temperature (T N = 560 ± 5 K) and the compensation temperature (T compensation = 260 ± 5 K).…”

“…Sirvetz and Zneimer [33] encountered this effect of partial pressure and of sintering temperature on the resistivity of rare-earth garnet: porous products sintered in air at 1250 • C presented 10 9 cm; dense pieces sintered in air at 1400 • C displayed 10 5 cm, and those sintered in pure oxygen at 1400 • C had 10 8 cm. Rodic et al [21] used 6 h sintering (at 1327 • C) to prepare GdIG and TbIG, which is longer than the 4 h applied here. Fig.…”

“…Rodic et al [20,21] carried out powder neutron diffraction measurements on the mixed terbium-yttrium iron garnet Tb 2.5 Y 0. 5 T comp (200 K) and at 117 K, as well as measurements of the initial magnetic susceptibility of TbIG in the compensation (comp) point region.…”

“…The T comp was found to be "quasi-proportional" to the terbium content and varied from 242 to 60 K [23]. Rodic et al [24] measured the initial magnetic susceptibilities of polycrystalline samples of TbIG, at temperatures close to the compensation point: they were characterized by small steps and points of inflection at T comp ± (10-12 K); in TbIG a jump of the lattice parameter was unambiguously identified.…”