Ba2Co9O14(BCO)是一种新型的电子-氧离子混合导体,在氧离子导体的固体氧化物燃料电池(SOFC)中,其作为阴极材料的应用可能性已经得到证实,本工作探索BCO在质子导体SOFC中的应用可能性。采用固相反应法制备BCO粉体,研究BCO与质子导体电解...Ba2Co9O14(BCO)是一种新型的电子-氧离子混合导体,在氧离子导体的固体氧化物燃料电池(SOFC)中,其作为阴极材料的应用可能性已经得到证实,本工作探索BCO在质子导体SOFC中的应用可能性。采用固相反应法制备BCO粉体,研究BCO与质子导体电解质BZCY(Ba Zr0.1Ce0.7Y0.2O3-δ)之间的化学相容性,分析BCO-BZCY复合阴极在BZCY电解质上的电化学性能。当复合阴极中BCO的质量含量为70%时,阴极性能最佳,界面阻抗活化能为1.26 e V。以BCO-BZCY为阴极,Ni-BZCY为阳极,BZCY为电解质的阳极支撑型单电池,700℃时,单电池的极化阻抗为0.15Ω·cm2,最大功率密度为400 m W·cm-2。展开更多
With the interest in using lead-free materials to replace lead-containing materials increasing,the use of Na_（0.5）Bi_（0.5）TiO_3（NBT） has come into our sight.We studied the composition of NBT and found that NaBiT...With the interest in using lead-free materials to replace lead-containing materials increasing,the use of Na_（0.5）Bi_（0.5）TiO_3（NBT） has come into our sight.We studied the composition of NBT and found that NaBiTi_6O_（14） ceramics can be compositionally tuned by Mg-doping on the Ti-site to optimize the dielectric properties.In this study,Mg-doped NaBiTi_6O_（14）（NaBi（Ti_（0.98）Mg_（0.02））_60_（14-d）） ceramics were prepared by a conventional mixed oxide route at different sintering temperatures,and their dielectric properties have been studied at a wide temperature range.X-ray diffraction（XRD） patterns of the NBT-based ceramics indicate that all samples have a pure phase without any secondary impurity phase.The experimental data show that after Mg-doping,the relative permittivity and dielectric loss become lower at 1040,1060,and1080 ℃ except 1020 ℃ and at different frequencies from 10 kHz,100 kHz to 1 MHz.Take 1060 ℃ for example,when the sintering temperature is 1060 ℃ at 1 MHz,the minimum relative permittivity of NaBiTi_6O_（14） is 32.9 and the minimum dielectric loss is 0.01417,the relative permittivity of NaBi（Ti_（0.98）Mg_（0.02））_60_（14-δ） under the same condition is 25.8 and the dielectric loss is 0.000104.We explored the mechanism of Mg-doping and surprisingly found that the dielectric property of NaBi（Ti_（0.98）Mg_（0.02））_60_（14-δ） becomes better owing to Mg-doping.Thus,NaBi（Ti_（0.98）Mg_（0.02））_60_（14-δ） can be used in microwave ceramics and applied to new energy materials.展开更多
Four crystals with the general formula of A3BGa3Si2O14 （A = Ca^2＋, Sr^2＋; B=Nb^5＋ , Ta^5＋） grown by using the Czoehralsky technique were reported. They are all uniaxial and belong to 32 point group. Their transm...Four crystals with the general formula of A3BGa3Si2O14 （A = Ca^2＋, Sr^2＋; B=Nb^5＋ , Ta^5＋） grown by using the Czoehralsky technique were reported. They are all uniaxial and belong to 32 point group. Their transmission, rotatory angle and specific rotation dispersion were investigated by speetrophotometer and compared with LGS. The transmission spectra show that they are transparent in the visible wavelength region beyond 294 nm and infrared region, and their transmission are all larger than that of LGS.The transmission spectra between parallel polasizers show that they have large optical activities which are larger than that of LGS. Of the four crystals, Sr3NbGa3Si2O14 has the largest optical activity ： 240.75 （°）·mm^-1 at 0.30 μm wavelength, 34.73 （°） ·mm^-1 at 0. 633 μm wavelength. The Bohzmann＇s coefficients of these crystals were calculated, which were in good agreement with earlier measurement in other reference.展开更多
A new complex[Ni(en) 2V 6O 14] n was hydrothermally synthesized and characterized by 2-dimensional vanadium oxide framework pillared by Ni(en) 2 group. Single crystal X-ray analysis indicates that this compound crysta...A new complex[Ni(en) 2V 6O 14] n was hydrothermally synthesized and characterized by 2-dimensional vanadium oxide framework pillared by Ni(en) 2 group. Single crystal X-ray analysis indicates that this compound crystallizes in monoclinic system, space group P2 1/c with a= 0.892 17(18) nm, b= 1.711 1(3) nm, c=0.662 73(13) nm, β=111.58(3)°, V=0.940 8(3) nm 3, Z=2, D c= 2.501 g/cm 3, R=0.042 3, wR=0.060 9, S=1.006.展开更多
The single crystal of GdP 5O 14 :Sm 3+ ,Pr 3+ (GdPP:Sm,Pr) was grown by the hydrothermal method. The crystal belongs to the monoclinic space group P2 1/ C by X ray powder diffraction results. The dependence of Pr 3+ i...The single crystal of GdP 5O 14 :Sm 3+ ,Pr 3+ (GdPP:Sm,Pr) was grown by the hydrothermal method. The crystal belongs to the monoclinic space group P2 1/ C by X ray powder diffraction results. The dependence of Pr 3+ ion concentration in GdPP:Sm,Pr crystals on the emission intensity of 4 G 5/2 → 6 H 7/2 transitions of Sm 3+ ion and the energy transfer between Sm 3+ and Pr 3+ ions have been investigated and discussed.展开更多
文摘Ba2Co9O14(BCO)是一种新型的电子-氧离子混合导体,在氧离子导体的固体氧化物燃料电池(SOFC)中,其作为阴极材料的应用可能性已经得到证实,本工作探索BCO在质子导体SOFC中的应用可能性。采用固相反应法制备BCO粉体,研究BCO与质子导体电解质BZCY(Ba Zr0.1Ce0.7Y0.2O3-δ)之间的化学相容性,分析BCO-BZCY复合阴极在BZCY电解质上的电化学性能。当复合阴极中BCO的质量含量为70%时,阴极性能最佳,界面阻抗活化能为1.26 e V。以BCO-BZCY为阴极,Ni-BZCY为阳极,BZCY为电解质的阳极支撑型单电池,700℃时,单电池的极化阻抗为0.15Ω·cm2,最大功率密度为400 m W·cm-2。
基金Project supported by the Fund from the Hubei Provincial Department of Education,China(Grant No.D20161006)
文摘With the interest in using lead-free materials to replace lead-containing materials increasing,the use of Na_（0.5）Bi_（0.5）TiO_3（NBT） has come into our sight.We studied the composition of NBT and found that NaBiTi_6O_（14） ceramics can be compositionally tuned by Mg-doping on the Ti-site to optimize the dielectric properties.In this study,Mg-doped NaBiTi_6O_（14）（NaBi（Ti_（0.98）Mg_（0.02））_60_（14-d）） ceramics were prepared by a conventional mixed oxide route at different sintering temperatures,and their dielectric properties have been studied at a wide temperature range.X-ray diffraction（XRD） patterns of the NBT-based ceramics indicate that all samples have a pure phase without any secondary impurity phase.The experimental data show that after Mg-doping,the relative permittivity and dielectric loss become lower at 1040,1060,and1080 ℃ except 1020 ℃ and at different frequencies from 10 kHz,100 kHz to 1 MHz.Take 1060 ℃ for example,when the sintering temperature is 1060 ℃ at 1 MHz,the minimum relative permittivity of NaBiTi_6O_（14） is 32.9 and the minimum dielectric loss is 0.01417,the relative permittivity of NaBi（Ti_（0.98）Mg_（0.02））_60_（14-δ） under the same condition is 25.8 and the dielectric loss is 0.000104.We explored the mechanism of Mg-doping and surprisingly found that the dielectric property of NaBi（Ti_（0.98）Mg_（0.02））_60_（14-δ） becomes better owing to Mg-doping.Thus,NaBi（Ti_（0.98）Mg_（0.02））_60_（14-δ） can be used in microwave ceramics and applied to new energy materials.
文摘Four crystals with the general formula of A3BGa3Si2O14 （A = Ca^2＋, Sr^2＋; B=Nb^5＋ , Ta^5＋） grown by using the Czoehralsky technique were reported. They are all uniaxial and belong to 32 point group. Their transmission, rotatory angle and specific rotation dispersion were investigated by speetrophotometer and compared with LGS. The transmission spectra show that they are transparent in the visible wavelength region beyond 294 nm and infrared region, and their transmission are all larger than that of LGS.The transmission spectra between parallel polasizers show that they have large optical activities which are larger than that of LGS. Of the four crystals, Sr3NbGa3Si2O14 has the largest optical activity ： 240.75 （°）·mm^-1 at 0.30 μm wavelength, 34.73 （°） ·mm^-1 at 0. 633 μm wavelength. The Bohzmann＇s coefficients of these crystals were calculated, which were in good agreement with earlier measurement in other reference.
文摘A new complex[Ni(en) 2V 6O 14] n was hydrothermally synthesized and characterized by 2-dimensional vanadium oxide framework pillared by Ni(en) 2 group. Single crystal X-ray analysis indicates that this compound crystallizes in monoclinic system, space group P2 1/c with a= 0.892 17(18) nm, b= 1.711 1(3) nm, c=0.662 73(13) nm, β=111.58(3)°, V=0.940 8(3) nm 3, Z=2, D c= 2.501 g/cm 3, R=0.042 3, wR=0.060 9, S=1.006.
文摘The single crystal of GdP 5O 14 :Sm 3+ ,Pr 3+ (GdPP:Sm,Pr) was grown by the hydrothermal method. The crystal belongs to the monoclinic space group P2 1/ C by X ray powder diffraction results. The dependence of Pr 3+ ion concentration in GdPP:Sm,Pr crystals on the emission intensity of 4 G 5/2 → 6 H 7/2 transitions of Sm 3+ ion and the energy transfer between Sm 3+ and Pr 3+ ions have been investigated and discussed.
