Fabrication and properties of La2O3-doped transparent yttria ceramics by hot-pressing sintering

Gan, Lin; Park, Young-Jo; Zhu, Linlin; Go, Shin-Il; Kim, Haneul; Kim, Jin-Myung; Ko, Jae‐Woong

doi:10.1016/j.jallcom.2016.11.059

Cited by 30 publications

(24 citation statements)

References 22 publications

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“…Wet chemical methods like coprecipitation and sol-gel provide a high degree of homogeneity, uniform particle size and purity [7]. Dense and transparent materials can be obtained by using different techniques, such as hot pressing [18], hot isostatic pressing (HIP) [19], vacuum sintering [20], self-propagating high-temperature synthesis (SHS) [21] and arc plasma synthesis [22].…”

Section: Introductionmentioning

confidence: 99%

Structural and Magneto-Optical Characterization of La, Nd: Y2O3 Powders Obtained via a Modified EDTA Sol–Gel Process and HIP-Treated Ceramics

Kruk

2020

Materials

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In this study, pure Y2O3, La0.1Y1.9O3 and La0.1Nd0.12Y1.78O3 nanosized powders were successfully synthesized by a modified sol–gel method. Pure and rare-earth ions doped yttria powders were characterized by X-ray diffraction, scanning electron microscopy and Brunauer–Emmett–Teller methods. The powders were sintered by the hot isostatic pressing process. The highest in-line transmittance of 56% was obtained at 800 nm and increased in the IR region. The influence of the lanthanum and neodymium ions on the physicochemical properties of yttria were discussed. The La-Nd-doped material exhibited a Verdet constant over 4000 deg/T·m at 400 nm and low thermal dependence. An interesting evolution of the Verdet constant across the absorption band with high resolution was studied. A study of the optical and magneto-optical properties of yttria doped with Nd3+ and La3+ is discussed in this paper.

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Section: Introductionmentioning

confidence: 99%

Structural and Magneto-Optical Characterization of La, Nd: Y2O3 Powders Obtained via a Modified EDTA Sol–Gel Process and HIP-Treated Ceramics

Kruk

2020

Materials

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“…As the La 3+ ion concentration increases, there may be structural defects introduced into the lattice of yttria. This may reduce mean free path of phonons and thereby enhance phonon scattering which contributes to the reduction in thermal conductivity with La 3+ concentration [17]. As the best member in the selected composition group, the sintering behaviour of LY3 sample was studied in detail.…”

Section: Resultsmentioning

confidence: 99%

“…La 2 O 3 precursors, like La(OH) 3 and La 2 O 2 CO 3 , are effectively used to sinter the pellets at 1800 ℃ to improve the transmittance to 82.72% and 83.34% respectively at 4 µm [11]. Recently Gan et al [17] used hot pressing sintering to achieve a density of 99.9% in 12 at% La doped yttria ceramics which showed a transmittance of 68.9% at 400 nm and 81.9% at 1100 nm, whereas a pellet sintered without applying pressure achieved 99.8% of the theoretical density. There is not much work reported in this system due to the difficulties in sintering the sample at low temperature with reduced grain size and minimum porosity.…”

Section: Introductionmentioning

confidence: 99%

Influence of La3+ ion in the yttria matrix in improving the microhardness of infrared transparent nano LaxY2-xO3 sintered via hybrid heating

et al. 2017

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Abstract:In the present work, hybrid sintering technique which couples the resistive heating and microwave heating is employed to sinter infrared transparent La 0.15 Y 1.85 O 3 to 99.2% of the theoretical density for the first time to the best of our knowledge. The presence of La 3+ in the yttria matrix improves the hardness properties to a greater extent without affecting the transmittance properties, but there is a deterioration in the thermal properties of the sample. So we have limited our studies to La 0.15 Y 1.85 O 3 which shows better optical, thermal, and hardness properties. The pellets fabricated from the ultra-fine nano powder with average particle size of ~12 nm synthesized by combustion technique and sintered at 1430 ℃ with an average grain size of 0.22 µm show ~80.1% transmittance in the UV-visible region and 81% in mid infrared region. For a comparative study of the optical, mechanical, and thermal properties, two other variants of sintering strategies namely conventional sintering and microwave sintering are also employed. A comprehensive analysis on the hardness reveals that the hardness of the pellets sintered via hybrid heating is 9.73 GPa and is superior to the pellets sintered using the other two techniques. The thermal conductivity of the sample is also analyzed in detail. The results clearly indicate that the La 0.15 Y 1.85 O 3 ultra-fine nano powder synthesised by the single-step combustion method and sintered via microwave hybrid heating shows better transmittance properties without compromising the mechanical properties, and can be used very effectively for the fabrication of infrared transparent windows and domes.

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“…To achieve this goal, researchers have made great efforts to synthesize powders with low degree of agglomerations, high sinterability by using the chemical co-precipitation, [18][19][20] ball milling, 21 and sol-gel combustion 22 processes. Meanwhile, translucent and transparent Nd-doped sesquioxide ceramics have been fabricated by using various sintering strategies: vacuum sintering, 21,23,24 H 2 atmosphere sintering, 19 hot pressing (HP), 25 hot isostatic pressing (HIP), 26 and spark plasma sintering (SPS). 27 29 Recently, using a Nd:Y 2 O 3 ceramic sample provided by our group, high efficiency CW lasing at ~1.08 and ~1.36 μm was reported, yielding the highest slope efficiency so far (49.6%).…”

Section: Introductionmentioning

confidence: 99%

Fabrication and microstructural characterizations of lasing grade Nd:Y₂O₃ ceramics

et al. 2019

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Transparent 0.6 at% Nd:Y2O3 ceramics were fabricated by vacuum sintering at 1550°C and hot isostatic pressing (HIP) at 1540°C. The ceramics sintered at such temperatures had good homogeneity with dense microstructures, without any residual pores and secondary phases. The in‐line transmittance reached 81.6% at 1000 nm and remained 81.1% at 650 nm. Continuous wave (CW) laser operation of an uncoated ceramic slab was evaluated. A maximum output power of 3.6 W with slope efficiency of 45.2% at 1.08 μm was obtained.

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Fabrication and properties of La2O3-doped transparent yttria ceramics by hot-pressing sintering

Cited by 30 publications

References 22 publications

Structural and Magneto-Optical Characterization of La, Nd: Y2O3 Powders Obtained via a Modified EDTA Sol–Gel Process and HIP-Treated Ceramics

Structural and Magneto-Optical Characterization of La, Nd: Y2O3 Powders Obtained via a Modified EDTA Sol–Gel Process and HIP-Treated Ceramics

Influence of La3+ ion in the yttria matrix in improving the microhardness of infrared transparent nano LaxY2-xO3 sintered via hybrid heating

Fabrication and microstructural characterizations of lasing grade Nd:Y₂O₃ ceramics

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Fabrication and properties of La2O3-doped transparent yttria ceramics by hot-pressing sintering

Cited by 30 publications

References 22 publications

Structural and Magneto-Optical Characterization of La, Nd: Y2O3 Powders Obtained via a Modified EDTA Sol–Gel Process and HIP-Treated Ceramics

Structural and Magneto-Optical Characterization of La, Nd: Y2O3 Powders Obtained via a Modified EDTA Sol–Gel Process and HIP-Treated Ceramics

Influence of La3+ ion in the yttria matrix in improving the microhardness of infrared transparent nano LaxY2-xO3 sintered via hybrid heating

Fabrication and microstructural characterizations of lasing grade Nd:Y2O3 ceramics

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Fabrication and microstructural characterizations of lasing grade Nd:Y₂O₃ ceramics