Kinetically controlled synthesis of metastable YAlO3 through molecular level design

Mathur, Sanjay; Shen, Hao; Rapalaviciute, Rasa; Kareiva, Aivaras; Donia, Nicole

doi:10.1039/b406760f

Cited by 49 publications

(22 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Al 2 O 3 powder was used as a reference material to observe the effect of heat treatment on the as-solidified sample. No apparent endothermic or exothermic peaks were detected up to 1673 K. The as-solidified RAlO 3 sample did not show any phase transition, i.e., the formed o-RAlO 3 phase remained even after annealing at 1673 K. This suggests that [47][48][49] However, we did not find any metastable phases in both the as-prepared and annealed samples.…”

Section: G Phase Identification and Microstructure Of Crystalline Racontrasting

confidence: 46%

Thermal and optical properties of glass and crystalline phases formed in the binary R2O3-Al2O3 (R = La-Lu and Y) system

Kumar

Ishikawa

Basavalingu

et al. 2013

Journal of Applied Physics

View full text Add to dashboard Cite

Rare-earth aluminate (RAlO 3 , R ¼ La-Lu and Y) glass and crystalline phases were prepared by containerless levitation in an aerodynamic levitation furnace. In the RAlO 3 system, La, Nd and Sm aluminum perovskites solidified as glass and Eu-Lu and Y aluminum perovskites solidified as crystalline phases. The glass forming region decreased with decreasing ionic radius of the rareearth element. Scanning electron microscopy images and x-ray diffraction results revealed the formation of a single RAlO 3 phase from the undercooled melt. The glass transition temperature, T g , and density increased and the molar volume decreased with decreasing rare-earth element ionic radius. The refractive index at 589 nm exceeds 1.85 in each composition and a transparency of approximately 72% was achieved for the LaAlO 3 glass. V C 2013 AIP Publishing LLC.

show abstract

Section: G Phase Identification and Microstructure Of Crystalline Racontrasting

confidence: 46%

Thermal and optical properties of glass and crystalline phases formed in the binary R2O3-Al2O3 (R = La-Lu and Y) system

Kumar

Ishikawa

Basavalingu

et al. 2013

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…5 shows FT-IR spectra observed after the annealing at different temperatures. The untreated sample shows an A TR peak at around 655 cm-', which is attributable to a certain vibration of chemical bonds between Al and 0 atoms or between Y and 0 atoms [13,14]. When the sample was annealed at 1200 or 1250 °c, a new ATR peak appears at around 630 cm-', indicating the appearance of a crystal structure different from Y Al03.…”

Section: Resultsmentioning

confidence: 99%

Crystalline structures of YAlO<inf>3</inf> single crystal at high temperatures

Inoue

Morimoto

Kasahara

et al. 2014

Proceedings of 2014 International Symposium on Electrical Insulating Materials

View full text Add to dashboard Cite

In order to clarify the influence of high temperature annealing on a next-generation gate insulating material Y AI03, single crystal Y AI03 samples were annealed at various temperatures from 900 to 1300 °c in air for about 12 hours. The crystalline structure was examined by X-ray diffractometry, while the surface profile was examined by atomic force microscopy and a surface profilometer. Furthermore, infrared absorption spectroscopy and optical microscopy were used. As a result, the following serial changes in structure were estimated. The perovskite structure of crystalline YAI03 starts to collapse and Y 3Als012 (Y AG) is formed by the annealing at 1160 0c. Then, it segregates to Ah03 and Y AI03 after the annealing at 1300°C.

show abstract

“…Yttrium–aluminium perovskite (YAG) is a metastable form in the Y 2 O 3 –Al 2 O 3 system, which is formed together with stable oxide phases such as Al‐rich cubic Y 3 Al 5 O 12 (YAG), Y‐rich monoclinic Y 4 Al 2 O 9 (YAM) and a metastable hexagonal phase (YAH) with the same YAP stoichiometry . In conventional methods for material processing of the YAP phase, the cubic and monoclinic forms are thermodynamically favoured and are invariably present along with orthorhombic YAPs.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of erbium‐doped YAlO₃ phosphor

Baig¹,

Saluja²,

Dhoble

2015

Luminescence

View full text Add to dashboard Cite

In the yttrium aluminium system, the YAlO3 phosphor is a prominent host because of the yttrium aluminium ratio (1:1). Phosphor was synthesized by the solid-state reaction method at variable concentrations of erbium (0.1-2.5 mol%). This method is suitable for large-scale production and is a less time-consuming method when compared with the soft synthesis method. The prepared sample was characterized by X-ray diffraction technique and the crystallite size was calculated by Scherer's formula. Vibrational and bending analysis of prepared phosphor for optimized concentration of erbium ion is described based on the Fourier transform infrared spectroscopic technique. The photoluminescence (PL) emission spectra of prepared phosphor for variable concentrations of erbium ion were recorded and the excitation spectrum was found to be at 291 nm with three shoulder peaks at 305, 270 and 242 nm. For 291 nm excitation, the emission spectrum was found at 546 nm and 552 nm. PL intensity increased with increasing concentrations of erbium and after 2 mol% emission intensity decreased due to concentration quenching. Spectrophotometric determination of YAlO3:Er(3+) is described by CIE co-ordinates and shows an intense emission in the green region such that the prepared phosphor can act as a single host for green light emission. Thermoluminescence glow curve analysis of the YAlO3:Er(3+) phosphor was recorded for different ultraviolet (UV) light exposures and gamma exposure. Different gamma doses 0.5-2 kGy show a linear response. Kinetic parameters were calculated by the peak shape method.

show abstract

Kinetically controlled synthesis of metastable YAlO3 through molecular level design

Cited by 49 publications

References 27 publications

Thermal and optical properties of glass and crystalline phases formed in the binary R2O3-Al2O3 (R = La-Lu and Y) system

Thermal and optical properties of glass and crystalline phases formed in the binary R2O3-Al2O3 (R = La-Lu and Y) system

Crystalline structures of YAlO<inf>3</inf> single crystal at high temperatures

Synthesis and characterization of erbium‐doped YAlO₃ phosphor

Contact Info

Product

Resources

About

Kinetically controlled synthesis of metastable YAlO3 through molecular level design

Cited by 49 publications

References 27 publications

Thermal and optical properties of glass and crystalline phases formed in the binary R2O3-Al2O3 (R = La-Lu and Y) system

Thermal and optical properties of glass and crystalline phases formed in the binary R2O3-Al2O3 (R = La-Lu and Y) system

Crystalline structures of YAlO<inf>3</inf> single crystal at high temperatures

Synthesis and characterization of erbium‐doped YAlO3 phosphor

Contact Info

Product

Resources

About

Synthesis and characterization of erbium‐doped YAlO₃ phosphor