The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Yongbin Hua - One of the best experts on this subject based on the ideXlab platform.
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synthesis and luminescence properties of reddish orange emitting ca2gdnbo6 sm3 phosphors with Good Thermal Stability for high cri white applications
Ceramics International, 2021Co-Authors: Yongbin HuaAbstract:Abstract Novel reddish-orange-emitting Ca2GdNbO6:Sm3+ phosphors based on the emission of 4G5/2 → 6H9/2 transition at 651 nm with the chromatic coordinate of (0.633, 0.366) were synthesized. The crystal structure and chemical purity were identified in detail. Under the 407 nm excitation, the optimum concentration of Sm3+ ion was found to be 5 mol% dominated by the dipole-dipole interaction in the Ca2GdNbO6 host material. The color purity of the sample with optimum doping was estimated to be about 78.38%. Besides, the Thermal Stability was also studied, and it was further found that the emission intensity remained 65.32% at 423 K. The packaged white LED device exhibited excellent CRI and CCT values of 92.43 and 4896 K. Finally, the polydimethylsiloxane film with a stable structure and flexible property was prepared. These above results reveal that novel reddish-orange-emitting Ca2GdNbO6:Sm3+ phosphors can be applied in high CRI white communication and flexible display applications.
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synthesis and luminescence properties of reddish orange emitting ca2gdnbo6 sm3 phosphors with Good Thermal Stability for high cri white applications
Ceramics International, 2020Co-Authors: Yongbin HuaAbstract:Abstract Novel reddish-orange-emitting Ca2GdNbO6:Sm3+ phosphors based on the emission of 4G5/2 → 6H9/2 transition at 651 nm with the chromatic coordinate of (0.633, 0.366) were synthesized. The crystal structure and chemical purity were identified in detail. Under the 407 nm excitation, the optimum concentration of Sm3+ ion was found to be 5 mol% dominated by the dipole-dipole interaction in the Ca2GdNbO6 host material. The color purity of the sample with optimum doping was estimated to be about 78.38%. Besides, the Thermal Stability was also studied, and it was further found that the emission intensity remained 65.32% at 423 K. The white LED device exhibiting excellent CRI and CCT values of 92.43 and 4896 K was packaged. Finally, the polydimethylsiloxane film with a stable structure and flexible property was prepared. These above results reveal that novel reddish-orange-emitting Ca2GdNbO6:Sm3+ phosphors can be applied in high CRI white communication and flexible display applications.
Xin Ning - One of the best experts on this subject based on the ideXlab platform.
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efficient synthesis of pvdf pi side by side bicomponent nanofiber membrane with enhanced mechanical strength and Good Thermal Stability
Nanomaterials, 2018Co-Authors: Ming Cai, Xiao Zhang, Xu Yan, Fuxing Chen, Ding Yuan, Xin NingAbstract:Bicomponent composite fibers, due to their unique versatility, have attracted great attention in many fields, such as filtration, energy, and bioengineering. Herein, we efficiently fabricated polyvinylidene fluoride/polyimide (PVDF/PI) side-by-side bicomponent nanofibers based on electrospinning, which resulted in the synergism between PVDF and PI, and eventually obtained the effect of 1 + 1 > 2. Scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) were used to characterize the morphology and chemical structure of nanofibers, indicating that a large number of side-by-side nanofibers were successfully prepared. Further, the Thermal Stability, mechanical strength, and filtration properties of PVDF/PI were carefully investigated. The results revealed that the bicomponent nanofibers possessed both Good mechanical strength and remarkable Thermal Stability. Moreover, the mechanical properties of PVDF/ PI were strengthened by more than twice after the heat treatment (7.28 MPa at 25 °C, 15.49 MPa at 230 °C). Simultaneously, after the heat treatment at 230 °C for 30 min, the filtration efficiency of PVDF/PI membrane was maintained at about 95.45 ± 1.09%, and the pressure drop was relatively low. Therefore, the prepared PVDF/PI side-by-side bicomponent nanofibers have a favorable prospect of application in the field of medium- and high-temperature filtration, which further expands the application range of electrospun fiber membranes.
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Efficient Synthesis of PVDF/PI Side-by-Side Bicomponent Nanofiber Membrane with Enhanced Mechanical Strength and Good Thermal Stability
MDPI AG, 2018Co-Authors: Ming Cai, Xiao Zhang, Xu Yan, Fuxing Chen, Ding Yuan, Xin NingAbstract:Bicomponent composite fibers, due to their unique versatility, have attracted great attention in many fields, such as filtration, energy, and bioengineering. Herein, we efficiently fabricated polyvinylidene fluoride/polyimide (PVDF/PI) side-by-side bicomponent nanofibers based on electrospinning, which resulted in the synergism between PVDF and PI, and eventually obtained the effect of 1 + 1 > 2. Scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) were used to characterize the morphology and chemical structure of nanofibers, indicating that a large number of side-by-side nanofibers were successfully prepared. Further, the Thermal Stability, mechanical strength, and filtration properties of PVDF/PI were carefully investigated. The results revealed that the bicomponent nanofibers possessed both Good mechanical strength and remarkable Thermal Stability. Moreover, the mechanical properties of PVDF/ PI were strengthened by more than twice after the heat treatment (7.28 MPa at 25 °C, 15.49 MPa at 230 °C). Simultaneously, after the heat treatment at 230 °C for 30 min, the filtration efficiency of PVDF/PI membrane was maintained at about 95.45 ± 1.09%, and the pressure drop was relatively low. Therefore, the prepared PVDF/PI side-by-side bicomponent nanofibers have a favorable prospect of application in the field of medium- and high-temperature filtration, which further expands the application range of electrospun fiber membranes
Huanfu Zhou - One of the best experts on this subject based on the ideXlab platform.
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Good Thermal Stability and improved piezoelectric properties of (K0.5Na0.5)NbO3-Bi(Mg0.75W0.25)O3 solid solutions
Journal of Materials Science: Materials in Electronics, 2016Co-Authors: Gaofeng Liu, Xiuli Chen, Guisheng Huang, Huanfu ZhouAbstract:In this paper, (1 − x)(K0.5Na0.5)NbO3–xBi(Mg0.75W0.25)O3 (x = 0–0.015) lead-free dielectric ceramics were investigated. XRD analysis certified that the Bi(Mg0.75W0.25)O3 has diffused into (K0.5Na0.5)NbO3 to fabricate a new solid solution. The addition of Bi(Mg0.75W0.25)O3 depressed the orthorhombic–tetragonal phase transition temperature from 210 to 176 °C and tetragonal–pseudocubic phase transition temperature (Curie point) from 419 to 400 °C. As x = 0.005, the ceramics exhibited high relative permittivity (e ~ 1325), low dielectric loss (tan δ < 2.9%) tan δ Stability (Δe/e168°C ≤ ±15%) in the temperature range of 168 ~ 369 °C. Especially, the ceramics also showed optimized piezoelectric constant (d33 = 122 pC N−1) and remnant polarization (Pr = 32.57 μC cm–2). These results indicated that the BMW added ceramics have potential applications in ferroelectric and Thermal Stability devices.
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k0 5na0 5 nbo3 bi zn0 5zr0 5 o3 perovskite ceramics high relative permittivity low dielectric loss and Good Thermal Stability
Ceramics International, 2015Co-Authors: Xiuli Chen, Huanfu Zhou, Guisheng Huang, Jie Chen, Liang FangAbstract:Abstract A novel lead-free perovskite ceramic system with the composition of (1− x )(K 0.5 Na 0.5 )NbO 3 – x Bi(Zn 0.5 Zr 0.5 )O 3 [(1− x )KNN– x BZZ, x =0–0.02] was developed. The effects of BZZ addition on the phase transition, microstructure and dielectric performances of KNN ceramic were systematically investigated. The BZZ addition can significantly enhance the relative permittivity and Thermal Stability of permittivity of ceramics below the Curie temperature. When x =0.015, the ceramic possessed the optimized dielectric performance with small Δ e / e 115 °C value (≤±15%) and relatively high permittivity (~1500) over the temperature range from 115 to 343 °C. Moreover, the dielectric loss was dramatically reduced below 4.5% from room temperature to ~544 °C, which suggests that this ceramic is a candidate for high-temperature capacitor application.
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high relative permittivity low dielectric loss and Good Thermal Stability of batio3 bi mg0 5zr0 5 o3 solid solution
Ceramics International, 2015Co-Authors: Xiuli Chen, Jie Chen, Liang Fang, Huanfu ZhouAbstract:Abstract (1− x )BaTiO 3 - x Bi(Mg 0.5 Zr 0.5 )O 3 (BT-BMZ, x =0–0.1) ceramics were fabricated via a conventional solid-state reaction method. The phase transition, microstructure and dielectric performances of the composites were investigated. It is intriguing that the relative permittivity ( e r ) increased rapidly (>10 5 ) at phase transition temperature by adding small amounts of BMZ ( x =0.01). With further increasing BMZ content (0.06≤ x ≤0.1), e r was deteriorated slightly, however, the temperature independence of permittivity was significantly improved (Δ e / e 200 °C
Shujun Zhang - One of the best experts on this subject based on the ideXlab platform.
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domain configuration and Thermal Stability of k0 48na0 52 nb0 96sb0 04 o3 bi0 50 na0 82k0 18 0 50zro3 piezoceramics with high d33 coefficient
ACS Applied Materials & Interfaces, 2016Co-Authors: Jialiang Zhang, Chaojing Lu, Shujun ZhangAbstract:The domain configuration of lead-free (K0.48Na0.52)(Nb0.96Sb0.04)O3–Bi0.50(Na0.82K0.18)0.50ZrO3 ceramics with rhombohedral–tetragonal morphotropic phase boundary, accounting for the high piezoelectric property and Good Thermal Stability, were systematically studied. Short domain segments (before poling) and long domain stripes with wedge-shaped or furcated ends (after poling) were found to be typical domain configurations. The reduced elastic energy, lattice distortion, and internal stress, due to the coexistence of rhombohedral and tetragonal phases, result in much easier domain reorientation and domain wall motion, responsible for the high piezoelectric properties, being on the order of 460 pC/N, in which the extrinsic contribution from irreversible domain switching was estimated to be around 50% of the total piezoelectricity. Minor piezoelectric property variations (<6% over a temperature range from −50 to 100 °C) were observed as a function of temperature, showing a Good Thermal Stability. In addition...
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enhanced piezoelectric properties of nb and mn co doped cabi4ti4o15 high temperature piezoceramics
Materials Research Bulletin, 2015Co-Authors: Yanxue Tang, Zongyang Shen, Yueming Li, Shujun ZhangAbstract:Abstract The properties of CaBi4Ti4O15 (CBT), CaBi4Ti3.95Nb0.05O15 (CBTN) and CaBi4Ti3.95Nb0.05O15 + 0.2 wt% MnO2 (CBTN–Mn) ferroelectric ceramics with bismuth layer structure were studied. Significant enhancement of piezoelectric coefficient was obtained for CBTN–Mn ceramics (d33 = 23 pC/N), being nearly three times that of CBT counterpart (d33 = 8 pC/N). Together with its high Curie temperature (Tc = 790 °C), low dielectric loss (tanδ = 0.2%), high resistivity (ρ = 4.2 × 106 Ω cm at 500 °C) and Good Thermal Stability up to 700 °C, the CBTN–Mn ceramic is a potential material for high temperature piezoelectric applications.
Liang Fang - One of the best experts on this subject based on the ideXlab platform.
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k0 5na0 5 nbo3 bi zn0 5zr0 5 o3 perovskite ceramics high relative permittivity low dielectric loss and Good Thermal Stability
Ceramics International, 2015Co-Authors: Xiuli Chen, Huanfu Zhou, Guisheng Huang, Jie Chen, Liang FangAbstract:Abstract A novel lead-free perovskite ceramic system with the composition of (1− x )(K 0.5 Na 0.5 )NbO 3 – x Bi(Zn 0.5 Zr 0.5 )O 3 [(1− x )KNN– x BZZ, x =0–0.02] was developed. The effects of BZZ addition on the phase transition, microstructure and dielectric performances of KNN ceramic were systematically investigated. The BZZ addition can significantly enhance the relative permittivity and Thermal Stability of permittivity of ceramics below the Curie temperature. When x =0.015, the ceramic possessed the optimized dielectric performance with small Δ e / e 115 °C value (≤±15%) and relatively high permittivity (~1500) over the temperature range from 115 to 343 °C. Moreover, the dielectric loss was dramatically reduced below 4.5% from room temperature to ~544 °C, which suggests that this ceramic is a candidate for high-temperature capacitor application.
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high relative permittivity low dielectric loss and Good Thermal Stability of batio3 bi mg0 5zr0 5 o3 solid solution
Ceramics International, 2015Co-Authors: Xiuli Chen, Jie Chen, Liang Fang, Huanfu ZhouAbstract:Abstract (1− x )BaTiO 3 - x Bi(Mg 0.5 Zr 0.5 )O 3 (BT-BMZ, x =0–0.1) ceramics were fabricated via a conventional solid-state reaction method. The phase transition, microstructure and dielectric performances of the composites were investigated. It is intriguing that the relative permittivity ( e r ) increased rapidly (>10 5 ) at phase transition temperature by adding small amounts of BMZ ( x =0.01). With further increasing BMZ content (0.06≤ x ≤0.1), e r was deteriorated slightly, however, the temperature independence of permittivity was significantly improved (Δ e / e 200 °C
