A Calorimetric Study of the Lanthanide Aluminum Oxides and the Lanthanide Gallium Oxides: Stability of the Perovskites and the Garnets

Kanke, Yasushi; Navrotsky, Alexandra

doi:10.1006/jssc.1998.7969

Cited by 124 publications

(122 citation statements)

References 54 publications

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“…Later Kanke and Navrotsky [10] reported enthalpy measurements by drop-in calorimetry with different RE-Al oxides, but LuAlO 3 was not measured in this report. It was claimed instead that LuAlO 3 could only be prepared under high pressure (which is obviously not true [3,4]) -as the stability was said to be limited by the disproportionation reaction…”

Section: Introductionmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, equilibria with the monoclinic phase were not discussed further in [10] and instead the decomposition of perovskite to garnet and Lu 2 O 3 was discussed quantitatively (Fig. 7 in [10]). The dissociation of several rare earth aluminum perovskites REAlO 3 (RE = Gd, Ho, Er, Y, Tm, Yb, Lu) according reaction (1) was found by Bondar' et al [11] who performed X-ray phase analysis of annealed poly-and single crystals.…”

Section: Introductionmentioning

confidence: 99%

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The melting behavior of lutetium aluminum perovskite

Klimm

2010

Journal of Crystal Growth

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DTA measurements with mixtures of aluminum oxide and lutetium oxide around the 1:1 perovskite composition were performed up to 1970• C. A peak with onset 1901• C was due to the melting of the eutectic Lu 4 Al 2 O 9 (monoclinic phase) and LuAlO 3 (perovskite). Neither peritectic melting of the perovskite nor its decomposition in the solid phase could be resolved experimentally. The maximum of the eutectic peak size is near x = 0.44, on the Lu-rich side of the perovskite, which is consistent with the conclusion that LuAlO 3 melts peritectically at ca. 1907• C as proposed by Wu, Pelton, J. Alloys Compd. 179 (1992) 259. Thermodynamic equilibrium calculations reveal, that under strongly reducing conditions (oxygen partial pressure < 10 −13 bar) aluminum(III) oxide can be reduced to suboxides or even Al metal. It is shown that under such conditions a new phase field with liquid Al can appear.

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Section: Introductionmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The melting behavior of lutetium aluminum perovskite

Klimm

2010

Journal of Crystal Growth

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“…-doped garnet phosphors have been investigated by Kalaji et al [65], and the results for the blue-/red-shift effect originating from different lattice size, bond length and local lattice distortions, are consistent with the conclusions found for (Gd,Tb,Y,Lu) 3 (Al,Ga) 5 O 12 :Ce 3? [64]. In more detail, Wu et al [57] and Seijo et al [66] found that the red-shift effect is related to static as well as vibrationally induced tetragonal distortions around the Ce 3?…”

Section: Case Studiesmentioning

confidence: 98%

“…b, c Schematic illustration of the local, dynamical lattice distortions at the Y site in YAG, adapted from [66]. In (b) the symmetric compression is shown, whilst in (c) the symmetric bending vibration is shown et al [63] [64]. A key observation was the observation of a red-shift when the lattice expands and a corresponding blue-shift when it contracts.…”

Section: Case Studiesmentioning

confidence: 99%

Inorganic Phosphor Materials for Lighting

2016

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This chapter addresses the development of inorganic phosphor materials capable of converting the near UV or blue radiation emitted by a light emitting diode to visible radiation that can be suitably combined to yield white light. These materials are at the core of the new generation of solid-state lighting devices that are emerging as a crucial clean and energy saving technology. The chapter introduces the problem of white light generation using inorganic phosphors and the structureproperty relationships in the broad class of phosphor materials, normally containing lanthanide or transition metal ions as dopants. Radiative and non-radiative relaxation mechanisms are briefly described. Phosphors emitting light of different colors (yellow, blue, green, and red) are described and reviewed, classifying them in different chemical families of the host (silicates, phosphates, aluminates, borates, and non-oxide hosts). This research field has grown rapidly and is still growing, but the discovery of new phosphor materials with optimized properties (in terms of emission efficiency, chemical and thermal stability, color, purity, and cost of fabrication) would still be of the utmost importance.

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