Synthesis and evolution of crystalline garnet phases in Y₃Sc_5–xGa_xO₁₂

Abstract

Mixed-metal oxides with the composition Y 3 Sc x Ga 5Àx O 12 (x ¼ 2.0, 2.1, 2.2, 2.25, 2.3, 2.4, 2.5, and 3.0) have been prepared by an aqueous sol-gel method. The effects of scandium substitution on the garnet phase formation were studied by IR spectroscopy and X-ray powder diffraction (XRD). The XRD data indicate that single-phase Y 3 Sc x Ga 5Àx O 12 ceramic samples were obtained for x ¼ 2.0, 2.1, 2.2, 2.25, 2.3, and 2.4. The results also show that the formation of Y 3 Sc x Ga 5Àx O 12 garnets depends on the molar ratio of scandium and gallium in the investigated composition, and consequently on the mean cationic radius at the Al 3þ sites. The variation of lattice parameters for the Y 3 Sc x Ga 5Àx O 12 phases with different x is reported.

Sol–gel synthesis, characterization and study of substitution effects in different gallium-containing garnets

“…In the YAG, all aluminium ions may be substituted by gallium or iron ions [28][29][30], while pure yttrium indium or yttrium scandium garnet is not obtained. The substitution limits on yttrium gallium scandium and yttrium aluminium gallium scandium mixed-metal garnets were discussed by Muliuoliene et al [31], Garskaite et al [32] and Skaudzius et al [33].…”

Syntheses and Characterisation of Gd3Al5O12 and La3Al5O12 Garnets

“…In the last few years, there has been a growing interest in this field in developing new preparative techniques for nanocrystalline garnet powders [17][18][19][20][21][22][23] . The sol-gel technology, due to its apparent advantages of fine homogeneity, high reactivity of starting materials, easier composition control, lower sintering temperature and lower costs, is a most promising method for preparation of nanostructured YAG ceramics [24][25][26] . The main aim of this study was to synthesise and characterise lanthanide (Gd and La) substituted yttrium aluminium garnet (YAG) compounds using an aqueous sol-gel processing route.…”

Synthesis and evolution of crystalline garnet phases in Y3Al5-xInxO12

“…As was mentioned, they have good thermal and optical properties, and additionally they are chemically stable and mechanically hard. (YAGG)) by an aqueous sol-gel method [19][20][21][22][23]. Some of the advantages of the proposed sol-gel synthesis technique, e.g.…”