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Reactive SPS of Al_(2)O_(3)–RE:YAG(RE=Ce;Ce+Gd)composite ceramic phosphors

Journal of Advanced Ceramics 2023年第5期12卷 1015-1032页

作者： Denis Yu.kosyanov Anastasia A.Vornovskikh Oleg O.Shichalin evgeniy k.papynov Anton A.Belov Aleksandra A.kosianova Aleksandr N.Fedorets Andrei A.Leonov Alexey P.Zavjalov Sergey A.Tikhonov Yanbin Wang Ziqiu Cheng Xin Liu Jiang Li Far Eastern Federal University Vladivostok 690922Russia Institute of Automation and Control Processes Far Eastern Branch of the Russian Academy of SciencesVladivostok 690041Russia Laboratory of Methods of Synchrotron Radiation Institute of Solid State Chemistry and MechanochemistrySiberian Branch of the Russian Academy of SciencesNovosibirsk 630128Russia kamchatka Branch of Geophysical Survey of the Russian Academy of Sciences Petropavlovsk-Kamchatsky 683006Russia key Laboratory of Transparent Opto-functional Inorganic Materials Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201899China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Ultrafine-grained Al_(2)O_(3)–rare earth:yttrium aluminium garnet(Al_(2)O_(3)–RE:YAG)(RE=Ce;Ce+Gd)composite ceramics were obtained for the first time by reactive spark plasma sintering(SPS)using commercially available initial oxide *** effect of key sintering parameters(temperature,dwell time,and external pressure(P_(load)))on densification peculiarities,structural-phase states,and luminescent properties of composites was studied *** in phase formation and densification between Ce-doped and Ce,Gd-codoped systems were *** of reactive SPS,at which there is partial melting with the formation of near-eutectic zones of the Al_(2)O_(3)–YAG system/coexistence of several variations of the YAG-type phase,were *** corundum–garnet biphasic ceramics with an optimal balance between microstructural and luminescence performance were synthesized at 1425℃/30 min/30–60 *** external quantum efficiency(EQE)of the phosphor converters reached 80.7%and 72%with close lifetime of~63.8 ns,similar to those of commercial Ce:YAG materials,which is promising for further applications in the field of high-power white light-emitting diodes(WLEDs)and laser diodes(LDs).

关键词： alumina–Ce^(3+)-doped yttrium aluminium garnet(Al_(2)O_(3)–Ce:YAG)ceramic phosphors reactive spark plasma sintering(SPS) structural-phase states microstructure luminescence performance

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Synthetic CaSiO3 sol-gel powder and SPS ceramic derivatives: “In vivo” toxicity assessment

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Progress in Natural Science:Materials International 2019年第5期29卷 569-575页

作者： evgeniy konstantinovich papynov Oleg Olegovich Shichalin Vladimir Iosifovich Apanasevich Igor Sergeevich Afonin Ivan Olegovich Evdokimov Vitaliy Yurievich Mayorov Arseniy Sergeevich Portnyagin Irina Grigorievna Agafonova Yulia Evgenievna Skurikhina Mikhael Azarievich Medkov Institute of Chemistry Far Eastern Branch of Russian Academy of Sciences Far Eastern Federal University Pacific State Medical University G.B. Elyakov Pacific Institute of Bioorganic Chemistry Far Eastern Branch of Russian Academy of Sciences

The paper presents template strategy using siloxane-acrylate latex and its modified form to prepare nanostructured calcium silicate(wollastonite) containing nanosized gold and regular porosity. Optimal conditions for the annealing of silicate xerogel were outlined leading to nanoporous wollastonite with minimal porous defects(pore size corresponds to latex particles 150–200 nm). The fabrication of nanostructured wollastonite ceramics was suggested to use spark plasma sintering(SPS). The formation of porous ceramic framework(compressive strength ～120 MPa) via SPS consolidation of silicate xerogel(xonotlite) contained latex template(poreformer),a feature of the method for wollastonite template synthesis. The ceramic wollastonite samples have been implanted into ICR/CD1 mice to test the toxicity of the material "in vivo". The results are of great interest for the preparation of high-quality biomaterials for modern medicine using simple technological approaches and available raw materials.

关键词： Porous wollastonite Biomaterials Sol-gel synthesis SPS Toxicity

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