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Xiuying Tian,Lei Li,Mengyuan Wei,Changyan Ji,Zhi Huang,Xin Liu,Jin Wen,Yangxi Peng 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.5
CaTiO3: Eu3+ red phosphors with high thermal stability and temperature sensitivity were synthesized by KCl flux assisted solidphase reaction method and they had orthorhombic perovskite phase. CaTiO3:15%Eu3+ had the irregular particle structure,with mean particle size of about 1.58 μm, while CaTiO3:15%Eu3+ +6%KCl also had the irregular particle structure, with meanparticle size of about 2.25 μm. When Eu3+ ion concentration was 15mol%, concentration quenching phenomenon took place,which could be explained by electric dipole-dipole interaction due to the critical Eu3+- Eu3+ distance of ~ 8.93 Å. We found thatKCl flux could increase the particle size and crystallinity, which was beneficial to luminescence property. Based on the PLspectra excited at 398 nm, the color coordinates of CaTiO3:15%Eu3+ were (0.5911, 0.4008) and the color purity was 97.7%,while the color coordinates of sample CaTiO3:15%Eu3++ 6%KCl were (0.6042, 0.3895) and the color purity was 98.4%. Therelative intensity IR1 and IR2 at 423 K is 87. 29% and 83. 22%, indicating the sample had high thermal stability. Based on TCLsFIR, Sr of CaTiO3:15%Eu3+ is 2322.67/T^2. CaTiO3:Eu3+ red phosphor was expected to be a promising inorganic material forpossible applications in temperature sensing.
Bio-inspired synthesis and optical properties of Dy3+- doped ZnS nanoparticles
Xiuying Tian 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.2
Dy3+-doped Zinc sulfide (ZnS) nanoparticles had been prepared via bio-inspired procedure and were characterized. Allsamples had cubic zinc blende structures. The typical sample had spherical structure with a diameter of ca. 68 nm. Withincreasing Dy3+-doped concentration, the bands attributed to C-O were shifted, due to the presence of Dy3+ ion in ZnS latticesite. The obtained bandgap were apparently lower than the reference value (~3.72 eV), beneficial for the photo-catalyticapplication. With increase of Dy3+-doped concentrations, enhanced photoluminescence (PL) of the sample at 1% wasattributed to large number of sulfur vacancies. The broad band with blue-green emission at ~ 500 nm indicated a considerablenumber of zinc vacancies to impart green emission and 4 F9/2- 6 H15/2 transitions of Dy3+ ions to impart blue emission.
Jilin Hu,Xiuying Tian,Chuanyue Hu,Yige Luo,Hongxia Peng,Jinqiu Luo 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.11
Different types of aluminum sources (such as Al2O3 and Al(OH)3) were used to prepare an Al2O3-ZrO2 composite powder inan alcohol-water system, in which ZrOCl2·8H2O and NH4HCO3 were used as starting material and precipitant, respectively. This study explores the effects of different types of aluminum sources and heat treatment on the preparation of Al2O3-ZrO2composite powder. The sintering property of the Al2O3-ZrO2 composite powder prepared from different types of aluminumsources was also investigated. Results indicate that Al2O3-ZrO2 composite powder prepared from Al(OH)3-containingprecursors after calcination at 600 oC possesses a relatively uniform spherical structure, with particle size ranging from 50 nmto 100 nm. As the calcination temperature increases, the particle size of powder prepared using precursors that containAl(OH)3 increases and the micro appearance of the particles gradually shifts from a mainly spherical structure to a diversifiedstructure, which can be spherical, sheet-like or rod-like. The Al2O3-ZrO2 composite powder prepared from Al(OH)3-containingprecursors exhibits satisfactory sintering property. The relative density of the sintered sample reaches 98.5%, and the Rockwellhardness reaches 85.5 HRA after sintering of the composite powder at 1550 oC for 2 hrs
Characterization of anorthite-based porcelain prepared by using wollastonite as a calcium source
Shumei Wang,Xiaoling Qi,Jilin Hu,Xiuying Tian 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.3
The porcelain based on anorthite (CaO • Al2O3 • 2SiO2) has been developed using wollastonite (CaO • SiO2) as a calcium source. The slip casting was applied to obtain green body with high-strength. The sintering behaviors of the green specimens were evaluated by determining linear shrinkage, water absorption, bulk density and flexural strength. It was found that the anorthite porcelain fired at 1215 o C had excellent technical properties such as water absorption: 0.00% and flexural strength: 109.5 MPa. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis results showed the high flexural strength was due to the densification of microstructures and the formation of high crystalline content in the porcelain body. In addition, thermal expansion performance and appearance quality of the final product were discussed.
Jilin Hu,Qizhong Huang,Hongxia Peng,Xiuying Tian,Zhanjun Chen,Yangxi Peng 한양대학교 세라믹연구소 2018 Journal of Ceramic Processing Research Vol.19 No.3
Aluminium oxide (Al2O3)-aluminium nitride (AlN) composites were prepared at 1500-1600 oC by pressureless sintering. Themain raw materials used were AlN and Al2O3, and appropriate amounts of TiO2-Y2O3-CaO-La2O3 quaternary sintering aidswere added. The effects of different AlN contents and sintering temperatures on the bulk density, bending strength, Rockwellhardness, thermal conductivity, and other properties of Al2O3-based ceramics were studied. The phase composition andmicrostructure of the samples were analysed with an X-ray diffractometer and scanning electron microscope. Results showedthat the Al2O3-AlN composites had excellent overall performance in terms of a flexural strength of 295.7MPa, a Rockwellhardness of 61.5 HRA, and a thermal conductivity of 38.8W/(m·K) (at 25 oC) after pressureless sintering at 1600 oC for 3 hwith 10 wt% AlN content. These properties met the requirements of high-power ceramic LED lamp holders. The Al2O3-10 wt%AlN composites sintered at 1600 oC had a dense microstructure, tight bonding among grains, and few pores, whichexplained the excellent performance of the samples.