Crystal chemical and magnetic studies of garnet systems

Geller, S.; Bozorth, R. M.; Miller, Cynthia A.; Davis, D. D.

doi:10.1016/0022-3697(60)90123-2

Cited by 25 publications

(2 citation statements)

References 8 publications

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“…The curves of the pigments synthesized at 1350 and 1450°C were almost flat, and their color was black or blackish red-brown. As the content of Fe 2 O 3 in pigments synthesized at 1450°C increased, the curve of the spectra resembled the curve of Fe 3 O 4 (spinel) 6). Therefore, the blackening of the pigments with a rise in the synthesized temperature and an increase in Fe 2 O 3 content is considered to be caused by the generation of the spinel.CIELAB L a b of the FA2 pigments is shown inTable 2.…”

mentioning

confidence: 81%

Effect of SiO2 and Al2O3 on the synthesis of Fe2O3 red pigment

Kikumoto¹,

Mizuno²,

Adachi

et al. 2008

J. Ceram. Soc. Japan

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Fe 2 O 3 red pigments, especially hematite particles have been widely utilized in many technologies, such as pigments, catalysts, coatings, flocculants, cosmetics, electronic materials ad abrasives. There are many commercially available Fe 2 O 3 powders for use as red pigment for Japanese porcelain enamel. However, the tone of red color of Fe 2 O 3 pigments was strongly influenced by synthesized temperature. It was important that the color-stable pigments, which were not affected by morphology and dispersal behavior, were synthesized for use as thermally stable red pigments. The present work was to study the possibility of synthesizing red inorganic pigments by composite of Fe 2 O 3 , Al 2 O 3 and SiO 2 .

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mentioning

confidence: 81%

Effect of SiO2 and Al2O3 on the synthesis of Fe2O3 red pigment

Kikumoto¹,

Mizuno²,

Adachi

et al. 2008

J. Ceram. Soc. Japan

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“…To that end, we have carried out a detailed study of the nuclear and magnetic structure, as well as the temperature- and field-dependent magnetic properties of CaY 2 ZrFe 4 O 12 . Interest in the nonmagnetic substitution of garnets has deep roots in the magnetic community with extensive work done on such compounds as CaY 2 SnFe 4 O 12 , Ca 3 Fe 2 Sn 3 O 12 , and Gd 3 Mn 2 GaGe 2 O 12 to name a few. − …”

Section: Introductionmentioning

confidence: 99%

Canting of the Magnetic Moments on the Octahedral Site of an Iron Oxide Garnet in Response to Diamagnetic Cation Substitution

et al. 2021

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Using neutron powder diffraction and magnetic susceptibility measurements, we report on the preparation and characterization of the temperature-and field-dependent properties of CaY 2 ZrFe 4 O 12 , a composition closely related to the high-temperature ferrimagnet Y 3 Fe 5 O 12 . By diluting the concentration of paramagnetic ions on the octahedral sublattice of the garnet structure, we find temperature-dependent canting of the magnetic moments. This reflects the importance of the octahedral sublattice in mediating the magnetic interactions between the tetrahedral sites and offers insight into a large number of competing magnetic interactions in the garnet structure.

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Importance of Intrasublattice Magnetic Interactions and of Substitutional Ion Type in the Behavior of Substituted Yttrium Iron Garnets

Geller¹,

Williams²,

Espinosa³

et al. 1964

Bell System Technical Journal

200

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The results of measurements at moderate to high magnetic fields on a large number of nonmagnetic ion substituted yttrium iron garnets suggest that intrasublattice interactions play an important role in determining their spontaneous magnetizations and Curie temperatures. It is shown that the system {Y3‐xCax} [Fe2] (Fe3‐xSix)O12 is continuously related to the system {Y3‐xCax}[ZrxFe2‐x](Fe3)O12 or {Y3} [ScxFe2‐x] (Fe3)O12. It is concluded that in these systems the tetrahedral‐tetrahedral (d‐d) antiferromagnetic interactions are stronger than octahedral‐octahedral (a‐a) antiferromagnetic interactions. The changes in magnetic structure from an ideal ferrimagnet, yttrium iron garnet, to an end‐member in which there are at least short‐range antiferromagnetic interactions (i.e., in {Ca3}[Fe2](Si3)O12 or a hypothetical {YCa2}[Zr2](Fe3)O12) should bear an analogy to the crystal chemical changes. It is therefore proposed that when substitution is made exclusively in one sublattice, the moments of the Fe3+ ions in that sublattice remain parallel (as in the Yafet‐Kittel theory), while the weakened average a‐d interactions and the intrasublattice interactions lead to random canting of the Fe3+ ion moments of the other. This tendency occurs as soon as substitution begins. On continued substitution, a point is reached beyond which canting increases much more rapidly with increasing substitution. In this region, the intrasublattice interactions dominate the a‐d interactions, but it is probable that the canting continues to be random. In the {Y3}[MgxFe2‐x](Fe3‐xSix)O12 system, the point at which the tetrahedral intrasublattice interactions dominate is reached at about x = 0.95 as contrasted with x ≅ 0.70 for the {Y3‐xCax}[ZrxFe2‐x](Fe3)O12 and {Y3}[ScxFe2‐x](Fe3)O12 systems. The canting of the d‐site ion moments increases at the same rate in the three systems to x ≅ 0.70, but beyond this point, the canting in the Mg‐Si substituted YIG is always substantially less than for the other two systems. This together with data on other substituted garnets indicates that the substitution of the Si4+ ions in the d‐sites lends to decrease the average d‐d interaction strength. Similarly, substitution in the a sites tends to decrease the average a‐a interaction strength. Measurements on some garnets in the systems {Y3‐yCay} [ScxFe2‐x]‐(SiyFe3‐y)O12, {Y3‐y+xCay‐x}[MgxFc2_x](Fe3‐vSiy)O12 and {Y3‐x‐yCax+y}‐[ZrxFe2‐x]{SiyFe3‐y)O12 indicate that different nonmagnetic ions may produce different magnetic behavior. This is especially noticeable in the region in which the intrasublattice interactions are dominant. Comparative behavior of the systems {Y3}[ScxFe2‐x](Fe3)O12 and {Y3‐xCax}[ZrxFe2‐x]‐(Fe3)O12 and of the systems {Y3‐xCax}[Fe2](Fe3‐xMx)O12, M ≡ Si and Ge, also indicates that the ion type is important in determining magnetic behavior. It is speculated that this results from effects on the interaction geometry, especially when the interactions are weak. Results on garnets in systems {Y3‐yCay}[ScxFe2‐x](Fe3‐ySiy)O12, (Y3‐y+xCay‐x} [MgxFe2‐x](Fe3‐...

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Crystal chemical and magnetic studies of garnet systems

Cited by 25 publications

References 8 publications

Effect of SiO2 and Al2O3 on the synthesis of Fe2O3 red pigment

Effect of SiO2 and Al2O3 on the synthesis of Fe2O3 red pigment

Canting of the Magnetic Moments on the Octahedral Site of an Iron Oxide Garnet in Response to Diamagnetic Cation Substitution

Importance of Intrasublattice Magnetic Interactions and of Substitutional Ion Type in the Behavior of Substituted Yttrium Iron Garnets

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