Novel Ca 0.2 Zr 0.8 O 1.8 :Eu 3+ phosphor is synthesized by high-temperature solid-state reaction method in air. Host Ca 0.2 Zr 0.8 O 1.8 with excitation 310 nm shows deep-blue broadband emission within the range 340–500 nm owing to the Zr 4+ → O 2− transition in [ZrO 8 ] group. Ca 0.2 Zr 0.8 O 1.8 :Eu 3+ phosphor with excitation 263 and 394 nm emits reddish-orange light owing to the 5 D 0 → 7 F J ( J = 1, 2, 3, and 4) transitions of Eu 3+ ion, and that with excitation 310 nm shows a systematically varied hue from deep-blue to reddish-orange by changing Eu 3+ ion concentration . Tunable emission and energy transfer are confirmed via spectral properties. The optimal Eu 3+ concentration is ∼5 mol% in Ca 0.2 Zr 0.8 O 1.8 :Eu 3+ phosphor and the corresponding fluorescence lifetime is ∼1.994 ms. The luminous mechanism is analyzed and explained by the simplified energy level diagrams of [ZrO 8 ] group and Eu 3+ ion in Ca 0.2 Zr 0.8 O 1.8 :Eu 3+ phosphor.
Selective and effective enrichment of phosphopeptides from complex samples is essential in phosphoproteome study by mass spectrometry (MS). In this work, we compared perovskites (MgTiO 3 , CaTiO 3 , SrTiO 3 , BaTiO 3 and CaZrO 3 ) with metal oxides (ZrO 2 and TiO 2 ) in their capability for the selective enrichment of phosphopeptides. It was found here that perovskites exhibited higher selectivity towards phosphopeptides than commonly used ZrO 2 and TiO 2 , even though they all have high affinity to phosphopeptides. As for perovskites, CaTiO 3 exhibited better selectivity for enrichment of phosphopeptides than SrTiO 3 , MgTiO 3 , BaTiO 3 and CaZrO 3 , which might be ascribed to their crystal structures and electrophilic abilities. Moreover, to further confirm the performance of CaTiO 3 , CaTiO 3 and TiO 2 were applied to the enrichment of phosphopeptides from tryptic digest of proteins of human Jurkat-T cell lysate, respectively. The results showed CaTiO 3 has much higher selectivity than TiO 2 in the enrichment of phosphopeptides from the complex biological sample. Taken together, here we show that CaTiO 3 is an excellent material for the highly selective enrichment of phosphopeptides and it could be potentially used in the large-scale phosphoproteome study.
Yizhou Xiao,Yuanbo Yang,Shuai Yang,Jinglei Li,Dan Liu,Jie Wu,Mingwen Wang,Chunchun Li,Fei Li
Modified BaTiO 3 ceramics that possess high dielectric permittivity and acceptable temperature stability have been widely utilized as multilayer ceramic capacitors (MLCCs) for high-frequency bypass and power filtering in automotive applications. However, since the increasing demand for high-capacity and small-size, high-permittivity materials that can serve as dielectric layers in MLCCs are urgently required. In this work, we design and fabricate a special BaTiO 3 -0.03Mg-0.02Y-0.02CaZrO 3 ceramic with a high dielectric permittivity of 3000 and the dielectric variation below ±13% in the temperature range of -55–150°C, fulfilling the requirements of X8R capacitors. To achieve these results, we employed grain size engineering and cation doping, using BaTiO 3 precursors with a particle size of 240 nm to prepare the BaTiO 3 -based ceramics with fine grains, while Mg and Y co-doping was used for improving the temperature stability due to dielectric dispersion. Utilizing these high-permittivity BaTiO 3 -based materials, we fabricated MLCCs that satisfy the X8R criterion, possessing a high dielectric constant of 2950 and a high breakdown field (410 kV/cm).
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