Glycothermal synthesis of rare earth iron garnets

1998 ◽  
Vol 13 (4) ◽  
pp. 856-860 ◽  
Author(s):  
Masashi Inoue ◽  
Toshihiro Nishikawa ◽  
Tomoyuki Inui
Keyword(s):  
Rare Earth ◽  
Yttrium Aluminum Garnet ◽  
Hydrothermal Reaction ◽  
The Other ◽  
Spontaneous Nucleation ◽  
Iron Garnets ◽  
Yttrium Aluminum ◽  
Ionic Size ◽  
Two Phases ◽  
Iron Garnet

The reactions of rare earth (RE) acetates with iron acetylacetonate in 1,4-butanediol at 300 °C (glycothermal reaction) yielded two novel phases depending on the ionic size of the RE element: one was obtained for Er-Lu and the other for Tb and Dy. The former phase was hexagonal REFeO3, while the latter phase has not been identified. The reaction of Y or Ho acetate yielded the mixture of these two phases. When the reactions were carried out in the presence of seed crystals of yttrium aluminum garnet (Y3Al5O12), these phases were not formed but RE iron garnet (RE3Fe5O12) grew on the seed, which suggests that spontaneous nucleation of RE iron garnet does not occur, but crystal growth proceeds easily under the glycothermal conditions. Hydrothermal reaction of the same starting materials yielded a mixture of Fe2O3 and an amorphous RE phase.

scholarly journals Влияние J-J-взаимодействия возбужденных состояний редкоземельного иона Pr-=SUP=-3+-=/SUP=- на магнитополяризованную люминесценцию празеодим-иттриевого граната-алюминия

2019 ◽  
Vol 61 (5) ◽  
pp. 848
Author(s):  
У.В. Валиев ◽  
Gary W. Burdick ◽  
Р.Р. Вильданов ◽  
R.Yu. Rakhimov ◽  
Dejun Fu
Keyword(s):  
Rare Earth ◽  
Circular Polarization ◽  
Spectral Region ◽  
Yttrium Aluminum Garnet ◽  
Visible Spectral Region ◽  
Irreducible Representations ◽  
Green Luminescence ◽  
Rare Earth Ion ◽  
Yttrium Aluminum ◽  
Polarization Of Luminescence

AbstractThe spectra of luminescence and magnetic circular polarization of luminescence of praseodymium–yttrium aluminum garnet Pr^3+ : Y_3Al_5O_12 (PrYAG) are studied in the visible spectral region at temperature T = 300 K. An analysis of spectral dependences of magnetooptical and optical spectra makes it possible to identify optical 4  f –4  f -transitions between Stark sublevels of multiplets ^3 P _0, ^3 P _1, ^3 Н _5, and ^3 Н _6 in PrYAG. It was shown that an important role in the spectrum of the degree of magnetic circular polarization of luminescence of this paramagnetic garnet is played by the effect of quantum-mechanical J – J mixing of states of Stark singlets ^3 Н _5 and ^3 Н _6 of non-Kramer rare-earth ion Pr^3+ in the “green” luminescence band related to forbidden 4  f → 4  f transition ^3 P _0 → ^3 Н _5 in the visible spectral region. To interpret the spectra of magnetic circular polarization of luminescence, the energy of experimentally determined Stark sublevels of multiplets under study, their irreducible representations and wave functions determined by numerical simulation of the energy spectrum of the rare-earth ion Pr^3+ in the garnet structure are used.

Facet-Related Site Selectivity for Rare-Earth Ions in Yttrium Aluminum Garnet

1971 ◽  
Vol 26 (25) ◽  
pp. 1570-1573 ◽  
Author(s):  
R. Wolfe ◽  
M. D. Sturge ◽  
F. R. Merritt ◽  
L. G. Van Uitert
Keyword(s):  
Rare Earth ◽  
Yttrium Aluminum Garnet ◽  
Rare Earth Ions ◽  
Site Selectivity ◽  
Yttrium Aluminum

Interface modification for increased fracture toughness in reaction-formed yttrium aluminum garnet/alumina eutectic composites

1999 ◽  
Vol 14 (10) ◽  
pp. 3907-3912 ◽  
Author(s):  
Luke N. Brewer ◽  
Derrick P. Endler ◽  
Shani Austin ◽  
Vinayak P. Dravid ◽  
Joseph M. Collins
Keyword(s):  
Rare Earth ◽  
Yttrium Aluminum Garnet ◽  
Rare Earth Ions ◽  
Alumina Powder ◽  
Interface Modification ◽  
Interfacial Toughness ◽  
Third Phase ◽  
Transmission Electron ◽  
Yttrium Aluminum ◽  
Scanning Transmission

The validity of controlling interfacial toughness in reaction-formed composites was explored using solid-state reaction processing and microanalysis techniques. A variety of rare-earth oxides was added to a yttrium aluminum garnet (YAG)/alumina powder mixture and then melted in air. Some melts retained the crystallography and microstructure of the pure, binary YAG–alumina eutectic. Using scanning transmission electron microscopy in conjunction with energy dispersive X-ray spectroscopy, rare-earth ions were observed both to segregate to the YAG/alumina interface and to form a third phase. Some evidence of increased crack deflection at these interfaces was observed via indentation fracture.

Luminescent and magnetic properties of cerium-doped yttrium aluminum garnet and yttrium iron garnet composites

2019 ◽  
Vol 45 (8) ◽  
pp. 9846-9851 ◽  
Author(s):  
Hyun Kyu Jung ◽  
Chang Hee Kim ◽  
A-Ra Hong ◽  
Seung Han Lee ◽  
Tae Cheol Kim ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Yttrium Iron Garnet ◽  
Yttrium Aluminum Garnet ◽  
Yttrium Iron ◽  
Yttrium Aluminum ◽  
Iron Garnet

scholarly journals Hydrothermal Synthesis of Various Magnetic Properties of Controlled Micro/Nanostructured Powders and Films of Rare-Earth Iron Garnet

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 972
Author(s):  
Natalia Tsidaeva ◽  
Ahsarbek Nakusov ◽  
Spartak Khaimanov ◽  
Wei Wang
Keyword(s):  
Magnetic Properties ◽  
Rare Earth ◽  
Hysteresis Loops ◽  
Structural Features ◽  
Nano Particles ◽  
Iron Garnets ◽  
Size Of Particles ◽  
Iron Garnet ◽  
Nanostructured Powders ◽  
The Rare Earth

In this study, the synthesis and magnetic properties of the rare-earth iron garnets Sm3Fe5O12, Pr3Fe5O12, and Er3Fe5O12 (in the form of powders and thin films) are reported. According to the composition, shape, and size of particles, the optimal precipitant for the synthesis of Sm3Fe5O12, Pr3Fe5O12, and Er3Fe5O12 films is an aqueous solution. The parameters for the synthesis of powders and films of the rare-earth iron garnets with micro- and nano-particles have been investigated and selected. The magnetic properties of these materials were studied; field dependencies of the magnetic moment (hysteresis loops) of nanostructured powders of iron garnets of samarium, praseodymium, and erbium in the range of +20 kOe to −20 kOe were obtained. The structural features of the Al2O3 substrate on which the films were formed are also shown.

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