Phase Separation in Garnet Solid Solutions and its Effect on Optical Properties

Kaveh, S.; Tremblay, C.; Norhashim, N.; Curry, Richard J.; Cheetham, Anthony K.

doi:10.1002/adma.201302288

Cited by 8 publications

(6 citation statements)

References 29 publications

(30 reference statements)

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“…To simulate Na clustering, the second model was constructed of two phases where the Na concentration, lattice parameter, and size/strain contributions to the peak shapes were allowed to refine independently. These methods have been used in many material systems to examine phase separation and structural heterogeneity. , Figure illustrates the fit of each model to the main reflection (021) of Sr 0.80 Na 0.20 Pd 3 O 4 . The total Na occupancy was not fixed in either of the models and refined to between 12% and 16% total occupancy.…”

Section: Resultsmentioning

confidence: 99%

“…These methods have been used in many material systems to examine phase separation and structural heterogeneity. 38,39 Figure 7 illustrates the fit of each model to the main reflection (021) of Sr 0.80 Na 0.20 Pd 3 O 4 . The total Na occupancy was not fixed in either of the models and refined to between 12 % and 16 % total occupancy.…”

Section: Electrical Properties and Electronic Structurementioning

confidence: 99%

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The Role of Structural and Compositional Heterogeneities in the Insulator-to-Metal Transition in Hole-Doped APd₃O₄ (A = Ca, Sr)

Lamontagne¹,

Laurita²,

Knight³

et al. 2017

Inorg. Chem.

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The cubic semiconducting compounds APd 3 O 4 (A = Ca, Sr) can be hole-doped by Na substitution on the A site and driven towards more conducting states. This process has been followed here by a number of experimental techniques in order to understand the evolution of electronic properties. While an insulator-to-metal transition is observed in Ca 1−x Na x Pd 3 O 4 for x ≥ 0.15, bulk metallic behavior is not observed for Sr 1−x Na x Pd 3 O 4 up to x = 0.20. Given the very similar crystal and (calculated) electronic structures of the two materials, the distinct behavior is a matter of interest.We present evidence of local disorder in the A = Sr materials through the analysis of the neutron pair distribution function which is potentially at the heart of the distinct behavior. Solid-state 23 Na nuclear magnetic resonance studies additionally suggest a percolative insulator-to-metal transition mechanism wherein presumably small regions with a signal resembling metallic NaPd 3 O 4 form almost immediately upon Na substitution, and this signal grows monotonically with substitution. Some signatures of increased local disorder and a propensity for Na clustering are seen in the A = Sr compounds.

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Section: Resultsmentioning

confidence: 99%

Section: Electrical Properties and Electronic Structurementioning

confidence: 99%

The Role of Structural and Compositional Heterogeneities in the Insulator-to-Metal Transition in Hole-Doped APd₃O₄ (A = Ca, Sr)

Lamontagne¹,

Laurita²,

Knight³

et al. 2017

Inorg. Chem.

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“…Typically, Bi 3 Fe 4 Ga : Ce have been utilized in laser, magnetic, magneto-optic, optical circulator, ion conductors and white light-emitting diodes (LEDs) etc. [1][2][3][4][5][6][7][8] Among them, white-LEDs, with the advantages of high light efficiency, low energy consumption, long service lifetime and being environmentally friendly have drawn much attention because of their wide applications. [9][10][11] Garnet structure compounds are stable from both a chemical and photochemical point of view.…”

Section: Introductionmentioning

confidence: 99%

Highly efficient cyan-emitting garnet Ca₃Hf₂SiAl₂O₁₂: xCe³⁺ phosphor for solid state white lighting

et al. 2015

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“…An analysis of the maps of element distribution in the region with a chemically heterogeneous grain composition showed that the dark areas of the grains had an excess of yttrium, whereas the impurity phase contained aluminum oxide. This suggests that there was segregation of the YAG components, possibly due to nonoptimal ceramic sintering or inadequate homogenization of the ceramic powder 34,35 . All types of defects described above were found in all ceramic samples of the S and ST series.…”

Section: Resultsmentioning

confidence: 96%

Silver nanoparticles as a new sintering additive for the fabrication of YAG:Ce optical luminescent ceramics

Kravtsov,

Medyanik,

Tarala

et al. 2023

J Am Ceram Soc.

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In this study, silver nanoparticles (NPs) were considered for the first time as a sintering additive in the manufacture of YAG:Ce luminescent ceramics. The influence of the addition of silver NPs on the sintering kinetics of ceramics was investigated. It was found that the addition of Ag NPs in the concentration range of 0.027–0.44 wt% does not result in the formation of secondary phases in YAG:Ce ceramics. It was demonstrated that the light transmission of ceramics is dependent on the concentration of Ag NPs. The use of NPs additive has made it possible to increase the light transmission of ceramics compared with the reference sample without sintering additives. The combination of two sintering additives, TEOS and silver NPs, enables the achievement of enhanced optical transparency in ceramics compared to the individual application of sintering additives. At an optimal silver concentration of 0.11 wt%, in combination with 0.5 wt% TEOS, a ceramic light transmission value of 77% was attained. The study has identified a correlation between the luminescence intensity of YAG:Ce ceramics and the concentration of silver NPs. It was observed that the utilization of low concentrations of the Ag additive had negligible impact on the luminescence properties, whereas the introduction of high concentrations of Ag NPs led to a deterioration in the luminescence and optical transparency of the ceramic.

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Phase Separation in Garnet Solid Solutions and its Effect on Optical Properties

Cited by 8 publications

References 29 publications

The Role of Structural and Compositional Heterogeneities in the Insulator-to-Metal Transition in Hole-Doped APd₃O₄ (A = Ca, Sr)

The Role of Structural and Compositional Heterogeneities in the Insulator-to-Metal Transition in Hole-Doped APd₃O₄ (A = Ca, Sr)

Highly efficient cyan-emitting garnet Ca₃Hf₂SiAl₂O₁₂: xCe³⁺ phosphor for solid state white lighting

Silver nanoparticles as a new sintering additive for the fabrication of YAG:Ce optical luminescent ceramics

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Phase Separation in Garnet Solid Solutions and its Effect on Optical Properties

Cited by 8 publications

References 29 publications

The Role of Structural and Compositional Heterogeneities in the Insulator-to-Metal Transition in Hole-Doped APd3O4 (A = Ca, Sr)

The Role of Structural and Compositional Heterogeneities in the Insulator-to-Metal Transition in Hole-Doped APd3O4 (A = Ca, Sr)

Highly efficient cyan-emitting garnet Ca3Hf2SiAl2O12: xCe3+ phosphor for solid state white lighting

Silver nanoparticles as a new sintering additive for the fabrication of YAG:Ce optical luminescent ceramics

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The Role of Structural and Compositional Heterogeneities in the Insulator-to-Metal Transition in Hole-Doped APd₃O₄ (A = Ca, Sr)

The Role of Structural and Compositional Heterogeneities in the Insulator-to-Metal Transition in Hole-Doped APd₃O₄ (A = Ca, Sr)

Highly efficient cyan-emitting garnet Ca₃Hf₂SiAl₂O₁₂: xCe³⁺ phosphor for solid state white lighting