Papers by Keyword: Flux Method

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Authors: Chang Liu, Xi Feng Qin, Zhu Hong Yang, Xin Feng, Xiao Hua Lu
Abstract: In this work, flux method is used to control the surface morphologies and crystal structures of the fine K2Ti6O13 fibers. When K2CO3 as a flux is added into fine K2Ti6O13 fibers and heated at 1100oC for 2h, the crystal of fibers are transformed to K2Ti4O9 and K2Ti2O5, however, the resulting fibers have no significant change in morphologies. On the other hand, when KCl is used as flux (15wt%) and heated at 1200oC for 2h, the diameters of the resulting fibers become about 2 micron without any change of the crystal structure.
201
Authors: Sho Yoshimura, Yuji Noguchi, Masaru Miyayama
Abstract: Large Bi0.5Na0.5TiO3 (BNT) single crystals with 10 mm × 10 mm × 5 mm were successfully grown by a flux method using BNT powder and the mixed flux composed of Bi2O3 and NaF. Dielectric measurements show a dielectric-permittivity peak at 310°C, which is the result of the gradual phase transition from rhombohedral (R3c) to tetragonal (P4bm) structure. Electric-field induced strain measurements along [100]C reveal that the effective piezoelectric strain constant (d33 *) was estimated to be 130 pm/V in a multidomain state.
35
Authors: Shunsuke Teranishi, Yuji Noguchi, Masaru Miyayama
Abstract: 0.999Bi0.5Na0.5TiO3-0.001BaTiO3 (BNT-0.1%BT) single crystals with a maximum size of 1×1×1 mm3 were successfully grown by a flux method using BNT-6%BT powder and Bi2O3 as a flux. The crystals showed a remanent polarization of 33 μC/cm2 and coercive electric field of 40 kV/cm along [100]Cubic. Electric-field induced strain measurements along [100]Cubic revealed an effective piezoelectric strain constant d33 * of 80 pm/V.
241
Authors: Chao Wang, Bing Teng, Lin Hua Xia, De Gao Zhong, Yu Yi Li, Mu Liu, Yang Li, Xiu Jie Feng, Xu Jun Deng
Abstract: The flux growrh method is employed to grow the Yb:LuPO4 crystal using lead pyrophosphate Pb2P2O7 as the high-timperature solvent. The infrared spectroscopy(IR) was tested to determine the purity of the obtained crystal. The absorption spectra of the 5% Yb-doped Yb:LuPO4 crystal was measured at room temperature. Three absorption peaks that located on 985nm, 976nm and 953nm were found, and the absorption cross sections on the absorption peaks were calculated respectively. The results shows that Yb:LuPO4 crystal has potential to be applied as laser material.
180
Authors: M. Nevřiva, P. Beran, D. Sedmidubský, A. Strejc, J. Hejtmánek, Charles Martin, O. Perez, S. Malo, B. Raveau
371
Authors: Rajemepu Saravanan, Dodla Rajesh, S. Velu Rajasekaran, Rajakempu Perumal, M. Chitra, Ramaswamy Jayavel
Abstract: Lead free piezoelectric single crystals of sodium potassium niobate (K 0.5Na0.5)NbO3 single crystals were grown by high-temperature solution method using B2O3 flux The KNN crystals grown by without B2O3 flux and with B2O3 flux are referred to as samples A and B respectively. It was found that additions of small amounts of boron oxide B2O3 further lower the melting temperature of the eutectic mixture and exhibits excellent dielectric properties. Phase analysis showed that all samples crystallized in pure orthorhombic perovskite phase. AFM morphological studies show that the root mean square (rms) roughness values were measured to be, 5.3nm and 6.96nm for the sample A and sample B crystal respectively. A slight decrease in the orthorhombic to tetragonal phase transition temperature TOT> and Curie temperature Tc has been observed in sample B when compared with sample A.
150
Authors: Peng De Han, Xiao Gu Huang, Qi Tu Zhang
Abstract: Up-conversion luminescent materials of Y2O2S: Yb, Tm with different doping concentrations of Tm3+ ion (0.5 mol%–4 mol %) and Yb3+ ion (4 mol%–16 mol %) were prepared by flux method. As Tm3+ doping concentration was 1 mol% and Yb3+ doping concentration was 8 mol%, the blue and red up-conversion luminescent intensity reached the maximum. The concentration quenching of Tm3+ was due to the reducing of the distance between Tm3+ ions and the cross-relaxation increasing. The concentration quenching of Yb3+ was attributed to increasing of nonradiative transition. The blue emission intensity of 1G43H6 was always weaker than the red emission intensity of 3F33H6, and the blue emission intensity of 1G43H6 is similar with the red emission intensity of 1G43F4.
558
Authors: Peng De Han, Le Zhang, Yan Chen, Li Xi Wang, Qi Tu Zhang
Abstract: Up-conversion luminescent materials of Y2O2S:Yb, Er with different doping concentrations of Er3+ ion (1 mol%–6 mol%) and Yb3+ ion (4 mol%–16 mol%) were prepared by flux method. As Yb3+ doping concentration was fixed at 8 mol%, when Er3+ doping concentration was 2 mol%, the green and red up-conversion luminescent intensity reached the maximum. As Er3+ doping concentration was fixed at 2 mol%, when Yb3+ doping concentration was 4 mol%, the green and red emission intensity reached the maximum. The up-conversion luminescent colours were adjustable.
381
Authors: Li Jie Hao, Kazuaki Iwasa, Rong Deng Liu, Xiao Bai Ma, Zhong Xiao Liu, Shi Liang Li, Ding Hu, Yun Tao Liu, Dong Feng Chen
Abstract: PrFe4P12 shows an anomalously phase transition from a heavy fermion (HF) state to a non-magnetic ordered state. We prepared single crystal sample of Pr (Fe1-xCox)4P12 by Sn-flux method to investigate the effects of electron doping. The distinct change of magnetic property was observed. The phase transition of PrFe4P12 rapidly disappears when doped rate x=0.03. This result indicates that the d-electron plays an important role in formation of Low-temperutre phase and HF state of PrFe4P12.
2793
Authors: Ke Feng Cai, L.C. Zhang, Q. Lei
Abstract: Sr or Ba filled type-I Ge clathrate single crystals were prepared using high pure elemental Ga, Ge, and Sr or Ba as the starting materials, and Ga as a flux. Powder X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), differential scanning calorimeter (DSC) were used to characterize the crystals, respectively. The results show that large and well-crystallized single crystals can be prepared under optimum synthesis condition. The composition of the crystals is in good agreement with the nominal composition (M8Ga16Ge30, M=Sr, Ba). Raman spectra of the single crystals were studied at room temperature and several of the Raman active vibrational modes in the crystals have been identified.
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