Lanthana-Strengthened Yttria Domes And Windows

Wei, George C.; Pascucci, Marina R.; Trickett, E. A.; Brecher, C.; Rhodes, W. H.

doi:10.1117/12.948119

Cited by 15 publications

(8 citation statements)

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“…It was long time ago recognized that optically isotropic powders (which basically means: crystallizing in cubic structure) could be sintered into highly-transparent bodies. [22][23][24][25][26] In time this technology got improved and it became clear that sintered optical ceramics offer great potentials and can successfully compete with single crystals technologies even in such demanding applications as lasers or scintillators. [27][28][29][30][31] What is more, lessons learn from sintering of optically isotropic materials allowed to broaden the research toward anisotropic compositions.…”

Section: R3079mentioning

confidence: 99%

SrS:Ce and LuPO₄:Eu Sintered Ceramics: Old Phosphors with New Functionalities

Zych¹,

Kulesza²,

Zeler³

et al. 2015

ECS J. Solid State Sci. Technol.

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Properties of SrS:Ce and LuPO 4 :Eu sintered ceramics are reported for the first time. Both materials were sintered at various temperatures up to 1700 • C. SrS:Ce sintered ceramics were found to form a new luminescent center(s) giving emission with maximum around 620 nm or 700 nm for 0.05% Ce and 5% Ce, respectively. This red-infrared band was continuously more potent with increasing sintering temperature and also for higher Ce concentrations both in photo-and radioluminescence. The new luminescent feature was shown to be formed by Ce 3+ ions with strongly perturbed symmetry compared to the octahedral one offered by the SrS host. After irradiation with X-rays LuPO 4 :Eu sintered ceramics produced a long lasting afterglow luminescence which was connected with thermoluminescence around 200 • C. The shape of the glow curve bands change with Eu concentration. For Eu content of 0.1% the TL band was quite symmetrical. For 5% of Eu the TL glow band appeared more structured and the 200 • C peak was associated with intense components around 150 • C and 330 • C. The former contributed into more potent afterglow at room temperature. Sintering of SrS:Ce and LuPO 4 :Eu induced new luminescent characteristics of both compositions endowing them with new, potentially usable functionalities.

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Section: R3079mentioning

confidence: 99%

SrS:Ce and LuPO₄:Eu Sintered Ceramics: Old Phosphors with New Functionalities

Zych¹,

Kulesza²,

Zeler³

et al. 2015

ECS J. Solid State Sci. Technol.

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“…Owing to their low infrared emissivity at both ambient and elevated temperatures, Y 2 O 3 ceramics are considered as a candidate material for use in hypersonic guided-missile windows and domes [4][5][6][7]. The use of La 2 O 3 permits the attainment of ceramics with high optical quality and good mechanical properties by eliminating pores and inhibiting grain growth during the Y 2 O 3 ceramic sintering process [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of transparent La-doped Y2O3 ceramics using different La2O3 precursors

Mao

Feng

et al. 2016

Journal of the European Ceramic Society

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“…Yttria (Y 2 O 3 ) is a cubic sesquioxide which is considered for various applications including infrared (IR) missile domes 1–4 as a host material for optical applications, 5,6 cutting tools, 7 a structural material for high temperatures, 8 and as a coating or a crucible material for molten reactive metals like Li, 7 Ti, 7 and U 7,9,10 …”

Section: Introductionmentioning

confidence: 99%

“…Transparent Y 2 O 3 for IR applications is usually produced by a combination of pressureless sintering at high temperature, T ∼2200 K, 1,4 pressure‐assisted sintering like hot pressing, 2,6 and pressureless sintering at T ∼2150 K followed by high‐temperature hot isostatic pressing (HIP), T ∼2050 K 3 . However, special pretreatments aimed at removing moisture from the powder particles, followed by relatively low‐temperature HIP T ∼1600 K, yield transparent Y 2 O 3 11 …”

Section: Introductionmentioning

confidence: 99%

Elastic and Mechanical Properties of Polycrystalline Transparent Yttria as Determined by Indentation Techniques

Albayrak

Basu

Sakulich

et al. 2010

Journal of the American Ceramic Society

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The Young's modulus (E) and nanoindentation (NI) stressstrain curves of fully dense, transparent yttria were determined using a nano-indenter capable of continually measuring the stiffness (S). Two hemispherical indenters with radii of 1.4 and 5 lm were used, in addition to a Berkovich tip. The E values-calculated from the S vs. a (contact radius) curves obtained with both spherical indenters (158-171 GPa) were % 5% lower than the 176 GPa dynamic modulus measured on the same sample using ultrasound. Depending on range of penetration depths, the Berkovich modulus was % 1%-5% higher than the dynamic modulus. When the NI load-displacement curves were converted to NI stress-strain curves, the yield point obtained was 771 GPa. This value was % 20% and % 33% lower than the Vickers and Berkovich hardness values measured on the same sample, respectively. The Vickers microhardness values (8.870.2 GPa) and the fracture toughness extracted from the latter (1.570.3 MPa . m 1/2 ) are in good agreement with published results on samples with comparable microstructures. The strain hardening rates were almost identical for both tips; no tip size effect was observed. Based on this work, we conclude that S vs. a plots are a powerful, and relatively simple, technique to measure the Young's moduli of polycrystalline ceramics and other hard solids. The fact that one also obtains NI stress--strain curves is a distinct advantage over the more commonly used Berkovich tip.

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Lanthana-Strengthened Yttria Domes And Windows

Cited by 15 publications

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SrS:Ce and LuPO₄:Eu Sintered Ceramics: Old Phosphors with New Functionalities

SrS:Ce and LuPO₄:Eu Sintered Ceramics: Old Phosphors with New Functionalities

Fabrication of transparent La-doped Y2O3 ceramics using different La2O3 precursors

Elastic and Mechanical Properties of Polycrystalline Transparent Yttria as Determined by Indentation Techniques

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Lanthana-Strengthened Yttria Domes And Windows

Cited by 15 publications

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SrS:Ce and LuPO4:Eu Sintered Ceramics: Old Phosphors with New Functionalities

SrS:Ce and LuPO4:Eu Sintered Ceramics: Old Phosphors with New Functionalities

Fabrication of transparent La-doped Y2O3 ceramics using different La2O3 precursors

Elastic and Mechanical Properties of Polycrystalline Transparent Yttria as Determined by Indentation Techniques

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SrS:Ce and LuPO₄:Eu Sintered Ceramics: Old Phosphors with New Functionalities

SrS:Ce and LuPO₄:Eu Sintered Ceramics: Old Phosphors with New Functionalities