Thermophysical properties of SrY2O4

Kurosaki, Ken; Tanaka, Takanori; Maekawa, Takuji; Yamanaka, Shinşuke

doi:10.1016/j.jallcom.2005.02.034

Cited by 26 publications

(8 citation statements)

References 16 publications

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“…The higher thermal conductivities of Sm 2 (Zr 0.8 Ce 0.2 ) 2 O 7 and Sm 2 (Zr 0.7 Ce 0.3 ) 2 O 7 as compared to Sm 2 Zr 2 O 7 can be attributed to the transformation of the crystal structure from pyrochlore to fluorite [15]. Although thermal conductivities of Sm 2 (Zr 0.8 Ce 0.2 ) 2 O 7 and Sm 2 (Zr 0.7 Ce 0.3 ) 2 O 7 are higher than that of Sm 2 Zr 2 O 7 , the average values of their thermal conductivities are 1.64 and 1.55 W/(m⋅K), respectively, which are lower than 2 W/(m⋅K)⎯the basic requirement of the thermal barrier coating for material thermal conductivity [5][6]. Thermal conductivity is one of the most critical requirements for thermal barrier coatings.…”

Section: Thermal Conductivitiesmentioning

confidence: 99%

“…In general, TBC materials have to fulfill most of the following requirements, such as a stable phase, low thermal conductivity, high thermal expansion coefficient, chemical resistance, low sintering rate, and high fracture toughness [5][6]. In recent studies, the rare earth zirconates with the type of Ln 2 Zr 2 O 7 (Ln represents rare earth element) have been investigated and the results show that these materials are significant for the top ceramic materials for future TBCs.…”

Section: Introductionmentioning

confidence: 99%

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Thermophysical properties of Sm2(Zr1−x Ce x )2O7 ceramics

Zhang

Sun

et al. 2009

Rare Metals

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Sm 2 (Zr 1−x Ce x ) 2 O 7 (x = 0.1, 0.2, and 0.3) ceramics were prepared by solid reaction method at 1600°C for 10 h using Sm 2 O 3 , ZrO 2 , and CeO 2 as starting reactants. The phase compositions, microstructures, thermal expansion coefficients, and partial thermal conductivities of these materials were investigated. X-ray diffraction (XRD) results reveal that Sm 2 (Zr 0.9 Ce 0.1 ) 2 O 7 with pyrochlore structure and Sm 2 (Zr 1−x Ce x ) 2 O 7 (x = 0.2 and 0.3) with fluorite structure were synthesized, and scanning electrical microscopy (SEM) images show that the microstructures of these products are very dense. The linear thermal expansion coefficients increase with increasing temperature in the temperature range from ambient to 1200°C, and the thermal expansion coefficients increase with increasing content of doped CeO 2 . The thermal conductivities of Sm 2 (Zr 0.8 Ce 0.2 ) 2 O 7 and Sm 2 (Zr 0.7 Ce 0.3 ) 2 O 7 decrease gradually with an increase in temperature. These results show that the synthesized ceramic materials can be explored as novel prospective candidate materials for use in new thermal barrier coating systems in the future.

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Section: Thermal Conductivitiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermophysical properties of Sm2(Zr1−x Ce x )2O7 ceramics

Zhang

Sun

et al. 2009

Rare Metals

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“…Thermal and photoluminescence properties of SrY 2 O 4 enable the preparation of thermal barrier coatings (TBC) [7,8], oxide fuel cells [9] as well as red phosphor (SrY 2-O 4 :Er 3? ) [10,11], green phosphor (SrY 2 O 4 :Ce 3? )…”

Section: Introductionmentioning

confidence: 99%

“…ions occupying the strontium-site and both Y-sites [11,15]. Besides classic solid-state synthesis based on thermal treatment of mixture of SrCO 3 and Y 2 O 3 powders [11,14,[16][17][18][19], special ceramics routes of preparation such as the plasma spark sintering [7,8], the sol-gel method [10], the polymeric gel route [9] and the nitric-decomposition method [15] were described. The synthesis of SrSm 2 O 4 by the combustion method is described in work [20].…”

Section: Introductionmentioning

confidence: 99%

Solid-state synthesis of SrY2O4 and SrSm2O4

Opravil

Ptáček

Šoukal

et al. 2015

J Therm Anal Calorim

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The course of solid-state synthesis of SrY 2 O 4 and SrSm 2 O 4 is described in this work. The processes during the thermal treatment, the mechanism and kinetics, the reactivity with water and the thermal stability of products were investigated by thermal analysis, isothermal calorimetry, infrared spectroscopy and scanning electron microscopy. Since solid-state synthesis does not show any significant effect on DTA, the course of synthesis was observed by the expansion of specimen. The kinetics of formation of SrY 2 O 4 and SrSm 2 O 4 is driven by the rate of reaction of 2nd order (g(a) = (1 -a) -1 -1) and requires the E a of 450 and 918 kJ mol -1 , respectively. The heat released by the reaction of SrSm 2 O 4 with water is significantly higher than that of SrY 2 O 4 .

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“…CaY 2 O 4 belongs to the ordered CaFe 2 O 4 structure, which is composed of a (R 2 O 4 ) 2− (R is rare earth metal) framework of double octahedral structure with rare earth ions residing within the framework. Due to the thermal and chemical stability, CaY 2 O 4 has been used in thermal barrier coating (TBC) materials [3,4].…”

Section: Introductionmentioning

confidence: 99%

Thermoluminescence and Photoluminescence Study of Erbium Doped CaY₂O₄ Phosphor

Dubey

Tiwari

Tamrakar

et al. 2015

Indian Journal of Materials Science

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Phosphor doped with erbium ion with variable concentration (0.5-2 mol%) was synthesized by solid state reaction method. CaY 2 O 4 :Er 3+ phosphor is characterized by X-ray diffraction technique for structural analysis and crystallite size calculation. Average crystallite size was found to be nearly 58 nm. Two prominent TL glow peaks found at 163 ∘ C associated with higher temperature peak 340 ∘ C. The peak intensity of higher temperature (340 ∘ C) peak was less as compared to lower temperature peak (163 ∘ C) because the deep trapping formation is less in case of UV irradiation. Sample shows good TL glow curve and for variable UV exposure time maximum TL intensity was found at 20 min UV exposure which is optimized UV exposure time. Sample was studied by photoluminescence emission spectra excited by xenon flash lamp with nearly 360 nm and four prominent peaks found at wavelengths 445, 525, 553, and 565 nm; here the 445 and 565 nm peak were intense as compared to others. From the PL emission spectra, it is concluded that the color tenability of prepared CaY 2 O 4 :Er 3+ was blue-green and it is verified by CIE coordinate. Kinetic parameters of prepared phosphor were calculated by computerized glow curve deconvolution (CGCD) technique.

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Thermophysical properties of SrY2O4

Cited by 26 publications

References 16 publications

Thermophysical properties of Sm2(Zr1−x Ce x )2O7 ceramics

Thermophysical properties of Sm2(Zr1−x Ce x )2O7 ceramics

Solid-state synthesis of SrY2O4 and SrSm2O4

Thermoluminescence and Photoluminescence Study of Erbium Doped CaY₂O₄ Phosphor

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Thermophysical properties of SrY2O4

Cited by 26 publications

References 16 publications

Thermophysical properties of Sm2(Zr1−x Ce x )2O7 ceramics

Thermophysical properties of Sm2(Zr1−x Ce x )2O7 ceramics

Solid-state synthesis of SrY2O4 and SrSm2O4

Thermoluminescence and Photoluminescence Study of Erbium Doped CaY2O4 Phosphor

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Thermoluminescence and Photoluminescence Study of Erbium Doped CaY₂O₄ Phosphor