CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Jiale Wu,Jin Hu,Zhongshan Deng,Yongjin Feng,Hongtao Fan,Zhiyi Wang,Kaijun Wang,Qingming Chen,Weijun Zhang
B 2 O 3 -MnO 2 -CdO ternary oxide glasses with amorphous properties were synthesised using the melt-quenching method. Structural and physical property analyses showed that the amount of non-bridging oxygen and the system stiffness increases, and the oxide network filling is more tightly packed as cadmium oxide (CdO) gradually replaces manganese Oxide (MnO 2 ) in the glass. The radiation-shielding performance of the B 2 O 3 -MnO 2 -CdO glasses was evaluated using the shielding parameters calculated by the MCNPX simulation and the Phy-X program. Glasses with 40% and 50% CdO loading exhibited an average specific lead equivalent (PbE) of 0.241 and 0.294 mmPb/mm in the medical X-ray diagnostic area at 0.03–0.08 MeV; thus, they could fully meet the specific PbE requirements for application as "protection devices against diagnostic medical X-radiation". Furthermore, their photon attenuation capability is superior to that of various commercial shielding glasses in fast-neutron nuclear applications at 1°–10 3 MeV. In addition, compared to the borate glass systems studied in the literature, B 2 O 3 -MnO 2 -CdO glasses have fast neutron removal cross-sections of 0.125 cm −1 at a smaller density of 3.9043–4.8135 g/cm 3 , making them potentially excellent fast neutron absorbers.
研究领域:
材料科学
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辐射防护
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
IF 3.5
Xuekai Wang,Yongze Cao,Xianglan Yan,Guojian Li,Xiangping Li,Jinshu Zhang,Baojiu Chen
Hexagonal Er 3+ /Yb 3+ co-doped LaZrTa 3 O 11 (LZTO) phosphor was prepared by molten salt synthesis with B 2 O 3 flux. Holding temperature, holding time, solute and solvent ratio were regulated. The green upconversion luminescence (UCL) integral intensity of the optimal sample can reach 29.2% of β-NaYF 4 :Er 3+ /Yb 3+ under 980 nm laser excitation. This outstanding pure green UCL is due to the low phonon energy, Er 3+ /Yb 3+ monolayer (2D) distribution, asymmetry of Er 3+ /Yb 3+ doped lattice sites, and low oxygen vacancy. The maximum relative temperature sensitivity attains 0.01221 K −1 at 303 K by employing luminescence intensity ratio (LIR) technique. LZTO:Er 3+ /Yb 3+ phosphor can be used in temperature sensing.
研究领域:
材料科学
·
光学
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高影响因子
Catalysis Science & Technology
·
2025
·
IF 4.2
Yumei Zhang,Yue Wang,Dongle Wang,Yating Liu,Tong Gao,Qingqiang Zhou,Qingzhi Luo,Jing An,Xueyan Li,Yandong Duan,Desong Wang
A novel Cu–B2O3/porous boron nitride (PBN) composite was developed as a highly efficient and reusable heterogeneous catalyst for the solvent-controlled conversion of arylboronic acids. In water, the catalyst promotes ipso-hydroxylation to phenols, while in methanol, it facilitates aerobic homocoupling to biphenyls, using air as a green oxidant. The synergistic interaction between Cu nanoparticles and B2O3 sites enhances both catalytic activity and stability. This work offers a sustainable and selective approach for synthesizing phenolic and biphenyl compounds under mild conditions.
研究领域:
催化化学
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有机合成
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材料化学
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绿色化学
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纳米催化
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高影响因子
Ceramics-Switzerland
·
2026
·Vol. 9
·期 4
·37
·
IF 2.8
Chaochen Chen,Fang Lei,Shiqing Dang,Hongyang Zhang,Ying Shi,Haohong Chen
To address the lack of suitable glass systems for silicon nitride (Si3N4) surface metallization, which requires high wettability and thermal stability, and robust bonding between the copper layer and the ceramic substrate, a novel Bi2O3-TeO2-B2O3-CuO glass system was developed. This study systematically investigated the influence of Bi2O3concentration, glass properties, optimized paste composition, and brazing mechanism using phase analysis, microstructural characterization, particle size statistics, thermal analysis, and tensile testing. An optimal glass composition containing 20 mol% Bi2O3was identified, exhibiting high thermal stability (ΔT = 224 °C) and a coefficient of thermal expansion of 9.63 × 10−6°C−1. At a brazing temperature of 750 °C, the glass demonstrated excellent wettability with a contact angle of 27°. A conductive paste comprising 94 wt% Cu and 6 wt% glass yielded a thick film with a minimum resistivity of 6.25 μΩ·cm and a maximum tensile strength of 25.2 MPa. Mechanism analysis revealed that the superior wettability drives the liquid glass phase to form a thin intermediate layer that significantly reinforces adhesion. These findings contribute to the research and development of subsequent novel glass systems with superior performance.
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CERAMICS INTERNATIONAL
·
2026
·
IF 6
Hesham Y. Amin,Safia Abdullah R. Alharbi,Abd El-razek Mahmoud,Essam A. Elkelany
Herein, a nickel-doped borate glass system, with variable additions of lead oxide, was prepared by melting and air quenching method. The impact of heavy lead oxide on structure, optical, electronic transitions, ligand field and nonlinear optical features was investigated. The glass structure was scrutinized by XRD, indicating the amorphousness of the current glass. The measured and empirical densities increased with lead oxide additions, indicating the densification of the network, while comparing both densities confirms the randomness of the glass network. Infrared spectra confirmed the deteriorated existence of non-bridging oxygen (NBO) bonds and the high ability of lead oxide to modify the glass network and form different structural units such as Pb . The current optical studies revealed the existence of ions in octahedral coordination, with high optical activity within some of the optronic transitions that were observed in visible and infrared regions. Among these optronic transitions, the transitions at 429, 524, 805 and 1222 nm were exploited using a Gaussian deconvolution process to determine the splitting energy and Racah parameters. Bewitchingly, the splitting energy increased; meanwhile, the Racah B and C parameters decreased, indicating that the lead addition increased the ligand- ions interaction energy and decreased the internal electronic interactions inside d-orbitals of ions. As a result of these interactions, the covalent bonding nature increased. Furthermore, lead oxide additions push the glass edges toward low energy, mitigating the optical band gaps from 3.41 eV to 2.92 eV, while Urbach energy increased due to enhanced amorphousness. Due to the higher polarizability of lead ions, the linear and non-linear optical properties of current glasses are enhanced.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Siping Wang,Zhaoyang Chen,Shala Bi,Zuyang Gao,Houjin Hu,Yi Liu,Bolong Zhang
Developing luminescent materials with lower cost and higher temperature sensitivity can provide more options for achieving precise optical thermometry. Therefore, the Tb 4 O 7 and Eu 2 O 3 co-doped BaO-ZnO-P 2 O 5 -B 2 O 3 glasses for optical thermometry were designed and synthesized using a high-temperature melting and quenching method. Due to the low optical basicity and the formation of defects of the glasses, the coexistence of Eu 2+ and Eu 3+ ions was achieved without the reducing agent. In Eu 2 O 3 doped glasses, the relative content variation of Eu 2+ and Eu 3+ ions was analyzed using high-resolution X-ray photoelectron spectroscopy. Emission spectra and fluorescence lifetimes confirmed the effective energy transfer processes between Eu 2+ and Tb 3+ or Tb 3+ and Eu 3+ , which play critical roles in the tunable white emission properties of the material. In the temperature-dependent fluorescence spectra, Eu 2+ ions exhibit significant thermal quenching behavior, which is key to achieving higher temperature sensitivity in optical thermometry. The Eu 2+ /Tb 3+ /Eu 3+ co-doped glasses were investigated for their optical temperature sensing behavior, utilizing the fluorescence intensity ratio techniques, within the temperature range of 273 K–498 K. The maximum absolute (at 498 K) and relative (at 273 K) sensitivity based on the fluorescence intensity ratio, were observed for Eu 2+ /Eu 3+ pairs were 0.145 K −1 and 1.46 % K −1 , respectively, outperforming the conventional Tb 3+ /Eu 3+ combination. Additionally, no significant fluctuation occurred during the repeated experiment. This work demonstrates that Eu 2+ /Tb 3+ /Eu 3+ co-doped BaO-ZnO-P 2 O 5 -B 2 O 3 glasses could be considered a promising candidate for optical thermometry.
研究领域:
材料科学
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光学
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Liu Yunan,Fu Renli,Lu Ran,Shen Minhao,Hu Yunjia,Bei Guoping
Low Temperature Co-Fired Ceramic (LTCC) substrates used for microwave circuits typically must have low dielectric loss and low permittivity, as well as the ability to co-fire with metals. The dielectric properties of the microcrystalline glass materials used as the LTCC substrates are closely related to the crystallization process during sintering. This study focuses on the crystallization process of CaO-B 2 O 3 -SiO 2 microcrystalline glass. Wollastonite and pseudowollastonite seeds were used to control the degree of crystal precipitation. The phase composition and microstructure of each sample were analyzed in detail to elucidate the changes in the dielectric properties and sintering performance of the material. The addition of crystal seeds as nucleation sites promoted crystallization and led to the formation of quartz crystals. The sintered samples exhibited excellent dielectric properties: ε r < 4 at 18 GHz, tan δ < 0.0015, and Q × f > 12000 GHz. They have great potential as high-performance LTCC substrates.
研究领域:
材料科学
·
电子工程
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Ziqiang Jiang,Jingtian Li,Guodong Sun,Weihua Luo,Peng Zhao
Transparent ceramics Y 3 Al 5 O 12 : Ce 3+ (YAG: Ce) were prepared by the spark plasma sintering (SPS) process with B 2 O 3 acting as the sintering additive. The effect of B 2 O 3 on the microstructure and luminescent properties were examined. With the help of the liquid phase created by the low melting point B 2 O 3 additives, the carbon contamination of the SPS prepared YAG: Ce ceramics was remarkably relieved, the relative density and the in-line transmittance were enhanced, and the starting temperature of densification was lowered by approximately 170 °C. Moreover, the B 2 O 3 additive could enter into the YAG host lattice as a dopant . Consequently, the smaller B 3+ ions replaced the Al 3+ ions, enhancing the crystal field splitting of Ce 3+ and significantly redshifting its 5d→4 f emission band.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Rui-Lin Lin,Wei-Chao Bao,Jun-Jie Yu,Wei-Ming Guo,Hua-Tay Lin
Based on the previous work on Si 3 N 4 -ZrB 2 , the addition of 2.5 vol.% ZrB 2 promoted α - to β -Si 3 N 4 phase transformation, bimodal microstructure, and toughness and strength improvement after hot-pressing at 1500 °C. However, the mechanism needed to be further explored. In the present work, the effect of ZrB 2 and its oxide impurities (ZrO 2 and B 2 O 3 ) on phase composition, microstructure and mechanical properties of Si 3 N 4 ceramics with MgO-Yb 2 O 3 additives were studied. Results showed that the addition of B 2 O 3 had no influence on Si 3 N 4 ceramics, whereas the addition of ZrO 2 inhibited the α - to β -Si 3 N 4 phase transformation, formed an uniform equiaxed microstructure, and deceased the toughness and strength. The positive effect of oxide impurities can be eliminated. Based on the STEM analysis , the possible reason was that the addition of ZrB 2 led to the formation of Si-Mg-O-N-Yb-Zr-B liquid phase , and then promoted α - to β -Si 3 N 4 phase transformation.
研究领域:
材料科学
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陶瓷
·
机械工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Tao Que,Yang Lu,Yiting Shan,Kai Huang,Fei Liu,Xiang Ding,Hongqing Zhou
The effects of CaO additive on the phase composition, sintering behaviour, microstructure, and properties of CaO–B 2 O 3 –SiO 2 (CBS) glass-ceramics were investigated. The results revealed that a small amount of added CaO (0.5 wt%, 1 wt%) facilitated the transformation of α-CaSiO 3 to β-CaSiO 3 and improved the crystallinity. When the amount was greater than 1 wt%, it weakened this transformation and also decreased the crystallinity. The pure CBS sample needed a sintering temperature of 850 °C for maximum densification, whereas the CaO-added samples achieved densification at a sintering temperature of 750–770 °C. The addition of an appropriate amount of CaO significantly enhanced the densification, dielectric properties , and flexural strength of CBS glass-ceramics. However, the addition of CaO had minimal impact on the coefficient of thermal expansion (CTE), which varied from 7.69 to 8.51 ppm/°C. The sample doped with 1 wt% CaO was sintered at 770 °C for 15 min, and it exhibited fairly ideal performance with a bulk density of 2.64 g/cm 3 , ε r of 6.43, tanδ of 0.9 × 10 −3 (15 GHz), and a CTE value of 7.69 ppm/°C.
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高影响因子
Chemical Science
·
2024
·Vol. 15
·期 32
·12964-12972
·
IF 7.6
Yuqing Dai,Zihan Hou,Gui Luo,Duo Deng,Wenjie Peng,Zhixing Wang,Huajun Guo,Xinhai Li,Guochun Yan,Hui Duan,Wenchao Zhang,Jiexi Wang
Benefiting from high energy density of ultrahigh-nickel cathode materials and good safety of PEO-based electrolytes, PEO-based ultrahigh-nickel solid-state lithium batteries (SLMBs) are considered to be new-generation energy storage devices. However, the incompatibility of ultrahigh-nickel cathode materials and PEO-based electrolytes is the main challenge due to serious interfacial side reactions. Therefore, the modification of the cathode/electrolyte interface is crucial. Herein, the residual lithium on the surface of LiNi0.9Co0.06Mn0.04O2 is utilized to construct an interfacial coating layer by reacting with H3BO3. The in situ formed xLi2O-B2O3 coating layer (LBO1-NCM) with high ionic conductivity can be regulated with different crystal structures during the sintering process. Besides, an all-solid-state three-electrode cell is fabricated, which verifies that the xLi2O-B2O3 coating can effectively stabilize the interface. Astonishingly, uneven Li anode deposition is observed in SLMBs, which is caused by the breakage of PEO molecular chains due to the strong oxidation of the cathode, while this crosstalk is also suppressed by the xLi2O-B2O3 coating layer. Consequently, Li|PEO|LBO1-NCM achieves a substantially improved electrochemical performance, exhibiting 90.5% of capacity retention after 100 cycles for the coin cell and 80.3% of capacity retention after 200 cycles for the pouch cell. Apparently, the targeted modification of interfaces should be paid as much attention as electrolyte optimization in SLMBs.
研究领域:
材料科学
·
电化学
·
能源存储
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DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Biao Wu,Meng Yan,Fen Luo,Xiaoyan Shu,Yi Liu,Guilin Wei,Zhentao Zhang,Yi Xie,Xirui Lu
Spent nuclear fuel contains 129 I, which has deleterious effects on human health. This study focused on the immobilization of iodine waste forms via a novel preparation method with B 2 O 3 –Bi 2 O 3 –ZnO–SiO 2 glass at 500–600 °C. The XRD results manifest that the sample with 30 wt % iodine sintered at 550 °C exhibits an obvious amorphous phase. The density of the samples with different iodine contents increases with the temperature increasing, so does the amorphous fraction except for 25 wt %. The FT-IR results reveal the matrix is mainly composed of [BO 3 ], [BO 4 ], [SiO 4 ], and [BiO 6 ]. TGA analysis shows high water content in the prepared samples. SEM-EDS results present that at 550 °C one part of the iodine is chemically immobilized into the glass matrix, and meanwhile, the other physically packed by the vitrified bulk. Our findings demonstrate the potential of the new preparation method for the disposal of iodine waste forms.
研究领域:
核废料管理
·
材料科学
·
环境工程
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高影响因子
危险品化学品经营许可证（带存储）