JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Lili Liu,Haijie Guo,Lei Wang,Qiufeng Shi,Jianwei Qiao,Cai’e Cui,Ping Huang
Ultraviolet-A persistent luminescence (UVA PersL) materials have attracted considerable attention due to their extensive potential in applications such as photodynamic therapy, photocatalysis, and sterilization. Herein, we report a novel UVA PersL phosphor Y 3 Ga 3 MgSiO 12 :Bi 3+ (YGMSO:Bi 3+ ) with continuous photocatalytic capabilities. The PersL duration of the YGMSO:0.005Bi 3+ sample can exceed 8 h after excitation with 254 nm UV light, and the UVA PersL emission peak is located at 324 nm. Specifically, we investigated the distribution and depth of traps using thermoluminescence curves and further demonstrated that oxygen vacancy is the main defect type responsible for producing PersL by X-ray photoelectron spectroscopy. On this basis, the PersL mechanism of YGMSO:Bi 3+ is established. Furthermore, considering that the UVA PersL spectrum of YGMSO:Bi 3+ aligns with the absorption band of TiO 2 , we synthesized YGMSO:Bi 3+ /TiO 2 composite for methylene blue degradation experiments. The experimental results indicate that the material can serve as a continuous excitation source for TiO 2 , facilitating its application in continuous photocatalysis. Overall, the developed UVA PersL material YGMSO:Bi 3+ offers valuable insights for the design of UVA light sources for photocatalytic applications.
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高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2025
·
IF 4.6
Zixuan Tian,Jialing Jiang,Lei Wang,Songtao Dong,Jing Luan,Hongbo Ju
BiCuSeO has attracted significant interest in the field of thermoelectric materials due to its layered crystalline structure, along with advantages such as abundant elemental availability, low thermal conductivity, and outstanding thermal stability. However, the inherently low electrical conductivity of BiCuSeOlimiting overall thermoelectricperformance. To address this, as an effective strategy to enhance thermoelectric performance, BiCuSeO was subjected to tri-element co-doping. Bi 1−3x (CaSrBa) x CuSeO (x = 0.0, 0.02, 0.03, 0.04, and 0.05) ceramics were synthesized using an advanced fabrication process that combined high-energy ball milling with hot-press sintering techniques. Substituting Ca 2+ , Sr 2+ , and Ba 2+ at the Bi 3+ sites effectively optimized the carrier concentration, increased the effective mass, and significantly enhanced the electrical conductivity from 9.67 to 91.55 S cm −1 . Notably, the power factor of the Bi 0.88 (CaSrBa) 0.04 CuSeO sample reached 476.54 μW m −1 K −2 at 323 K. and electrical conductivity. Simultaneously, the introduction of lattice defects through co-doping considerably enhanced phonon scattering, reducing the lattice thermal conductivity to 0.342 W m −1 K −1 for Bi 0.85 (CaSrBa) 0.05 CuSeO, compared with 0.447 W m −1 K −1 for the pristine sample. Consequently, a maximum dimensionless figure of merit ( ZT ) of 0.65 was achieved at 773 K for Bi 0.88 (CaSrBa) 0.04 CuSeO. These findings provide valuable insights into improving the thermoelectric performance of BiCuSeO-based materials through multi-element co-doping.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2025
·
IF 5.7
Jinxin Fu,Changrong Zhou,Jinfang Cai,Qingning Li,Changlai Yuan,Jiwen Xu,Guanghui Rao
To meet the demands of aerospace and other fields for stable performance of piezoelectric ceramics in high-temperature environments, ensuring consistent performance across a wide temperature range has become a critical issue to address. This study developed composite ceramics by combining BNT-7BT and BNT-20BKT, both exhibiting morphotropic phase boundary (MPB) characteristics and similar piezoelectric coefficients. The multiphase coexistence in these ceramics preserved high piezoelectric performance ( d 33 ∼162pC/N) while minimizing the adverse effects of quenching on d 33 . The compositional gradient induced by inhomogeneous diffusion pinned domain walls, thereby suppressing domain disordering at high temperatures and effectively restricting the fluctuation of d 33 to ≤11.5% across the operational temperature range until depolarization. The quenching-induced thermal gradient generated a built-in electric field (E b ) that effectively compensated the depolarization field (E d ), enabling the composite ceramics to achieve an ultrahigh depolarization temperature ( T d ) of 195 °C. This work successfully integrates high d 33 , T d , and thermal stability in BNT-based ceramics, offering a promising solution for high-temperature applications.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 23
·40067-40078
·
IF 5.6
Meng Wang,Ting Wang
BiFeO 3 -BaTiO 3 exhibits a high dielectric constant , excellent ferroelectric properties, and mechanical stability , making it a promising material for energy storage applications . However, unmodified BiFeO 3 -BaTiO 3 ceramics typically exhibit high residual polarization and low breakdown strength , resulting in low energy storage density and efficiency. In this study, (1- x )(0.67BiFeO 3 -0.33BaTiO 3 )- x (Sr 0.7 Nd 0.2 )TiO 3 ceramics were prepared and demonstrated a pseudo-cubic perovskite structure at room temperature. As the x value increased, the long-range ordered ferroelectric structure was disrupted, the relaxation characteristics were enhanced, and the grain size decreased significantly. The maximum polarization strength (P max ) of the composition with x = 0.15 reached 38.57 μC/cm 2 at 180 kV/cm. Under low electric fields, this material achieved an excellent recoverable energy storage density (W rec ) of 2.57 J/cm 3 and a high energy storage efficiency (η) of 79 %, while also exhibiting good frequency stability and charge/discharge performance. These characteristics suggest its potential application as a next-generation electrostatic capacitor material.
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JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Feng Wang,Meiqi Zheng,Xiyan Zheng,Peng Liu,Daosheng Liu,Jiageng Liu,Shankui Wei,Chun Wang,Yongdong Liu,Jianqiu Deng
Due to the remarkable high energy density and high operating voltage, lithium-rich layered oxides (LLOs) are emerging as one of the most promising candidates for high-specific-energy cathode materials . However, the poor cycling stability and severe voltage degradation are key barriers, which limit their practical application. In this paper, Bi 2 O 3 modified Li 1.2 Mn 0.6 Ni 0.2 O 2 (LMO@BO) is developed to address these challenges. The uniform and dense coating is constructed on the surface of LMO, which utilizes number of oxygen vacancies in its crystal structure to mediate the release of O 2 and mitigate the irreversible loss of lattice oxygen, further suppress the phase transformation during the cycling process. Specifically, the specific discharge capacity of the LMO@BO cathode maintains 197.9 mAh g −1 at 1C with capacity retention rate of 96.3 % after 200 cycles(vs. unmodified LMO with capacity of 147.5 mAh g −1 and retention rate of 80.1 %. Meanwhile, a small amount of Bi 3+ is doped into the bulk phase to broaden the Li + migration channel, resulting in an efficient Li + diffusion. Overall, Bi 2 O 3 modified LMO sample is conducive to meeting the requirements of high energy density for lithium-ion batteries applications.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xiangshuai Wang,Mengwei Tian,Zihao Zheng,Jinming Guo,Ji Zhang,Kongjun Zhu,Jing Wang
Dielectric capacitors have been widely employed in advanced pulse power technology and electronic devices. Nevertheless, the insufficient recoverable energy storage density and efficiency pose a major obstacle for realizing further miniaturization and integration. Herein, multilayer structured NaNbO 3 -based ceramics, composed of random and textured layers with identical chemical compositions, were prepared via the tape casting technique. As a result, in the sample with two random layers outside and one textured layer in middle, a remarkable recoverable energy storage density of 11.9 J/cm 3 with an efficiency of 76.8 % is achieved concurrently at an electric field of 728 kV/cm. The finite element simulation implicates that this approach effectively tunes local electric potential, electric field and polarization distributions. More importantly, the investigated ceramics exhibited benign stability over a wide temperature range (20–100 °C), frequency range (1–500 Hz) and cycling up to 10 5 cycles. This work not only provides a multilayer structured ceramic applicable to novel high-performance dielectric capacitors, but also proposes a feasible strategy for regulating the local electric field and polarization distributions and finally boosting the energy storage performance.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2026
·Vol. 37
·期 20
·1612
·
IF 3.2
Yao Long,Xu Fang,Yang Hongwei,Ren Yong,Liu Guixiang,Dai Bo
This study demonstrated that magnetic properties of the LiZnTi ferrite can be enhanced by precisely controlling the dosage of Nb 2 O 5 and Bi 2 O 3 additives. XRD results indicated that the ferrite possessed a spinel structure. Furthermore, SEM revealed that the synergistic effect of Nb 2 O 5 and Bi 2 O 3 not only effectively suppressed the growth of big grains but also promoted the densification of the LiZnTi ferrite. Moreover, the magnetic performance was further enhanced when doped with 0.40 wt.% Nb 2 O 5 and 1.50 wt.% Bi 2 O 3 . Specifically, the ferromagnetic resonance linewidth ( ΔH ) decreased to 220 Oe and the saturation magnetization (4π M s ) of LiZnTi ferrite increased to 2619 Gs. The improvements of magnetic performance indicated that Nb 2 O 5 and Bi 2 O 3 are promising composite additives for the preparation of low-loss ferrite materials for microwave devices.
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CERAMICS INTERNATIONAL
·
2026
·
IF 6
Chenyang Zhang,Qiu Zhang,Liying Pan,Xueyue Lyu,Xinrui Wang,Jiawei Qi,Yuying Chang,Yutong Zhang,Guangdong Zhao
Lead-free dielectric ceramics exhibiting both high recoverable energy density and ultrahigh efficiency are critically sought for advanced pulsed power applications; however, achieving these properties remains challenging due to inherent trade-offs among polarization difference, energy loss, and breakdown strength in conventional antiferroelectric systems. In this work, (1− x )NaNbO 3 – x Sr 0 . 7 Bi 0 . 2 TiO 3 [(1− x )NN– x SBT] ceramics were successfully synthesized via a conventional solid-state method, and the composition–structure–property relationships were systematically elucidated. Structural characterizations indicate that increasing the SBT content induces a continuous transition from long-range antiferroelectric ordering to a relaxor state, accompanied by enhanced lattice disorder and the formation of polar nanoregions (PNRs), as confirmed by X-ray diffraction (XRD), Raman spectroscopy, and transmission electron microscopy (TEM) analyses. Concurrently, significant grain refinement and improved microstructural homogeneity effectively enhance the breakdown strength. Consequently, the polarization behavior evolves from hysteretic domain switching to highly reversible PNR-dominated responses, resulting in markedly suppressed remnant polarization and an increased polarization difference (Δ P ). As a result, the optimized compositions exhibit outstanding energy-storage performance, with a maximum recoverable energy density ( W rec ) of 8.17 J/cm 3 obtained at x = 0.7 and an ultrahigh energy-storage efficiency ( η ) of 99.8% achieved at x = 0.8 under a high breakdown strength of 620 kV/cm. Furthermore, the optimized ceramics exhibit excellent thermal stability over 20–140 °C, robust fatigue endurance up to 10 5 cycles, and ultrafast discharge characteristics with a t 0.9 of approximately 50 ns, together with a high-power density. These superior performances are attributed to the synergistic effects of PNR-dominated dynamic polarization, suppressed long-range antiferroelectric ordering, and refined microstructure. This work provides a clear strategy for designing high-performance lead-free NaNbO 3 -based dielectric capacitors through coordinated structural disorder and nanoscale polarization engineering.
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JOURNAL OF RARE EARTHS
·
2026
·
IF 9.6
Biao Xu,Zihao Xu,Chunyu Li,Jian Peng,Xingyu Li,Wubin Dai
Phosphor with thermally stable and highly efficient photoluminescence (PL) is a premise/challenge for use in high-quality phosphor-converted light-emitting diodes (pc-LEDs). Herein, via a facile solid-phase sintering method in air, a negative thermal quenching (TQ) blue emitting SrGa 2 B 2 O 7 (SGB): Bi is reported, mainly associating with the underlying collaborative effect of negative volumetric thermal expansion of rigid host, heterovalent substitution (Bi 3+ → Sr 2+ )-induced V Sr /V O vacancies, and generating self-reduction ions (Bi 2+ ). For charge balance under the condition of temperature rising, both opposite process of self-oxidation (Bi 2+ to Bi 3+ ) and charge release from trap levels can compensate blue-PL loss. This phosphor is comparable to Eu 2+ /Ce 3+ -activated blue-emitting phosphors, and even boasts superior quantum efficiency (QE) and thermal stability. Via artificially codoping Na + for charge compensation, the QE of the SGB:Bi/Na can be further significantly enhanced. Color-tunable PL is achieved via cascade-connected energy transfer (ET) from Bi 3+ to Tb 3+ (green)/Eu 3+ (red) in SGB: Bi/Na/Tb/Eu that possesses high QE/stability than the case of blue/green/red tricolor phosphor blends adopted in warm white LEDs (wLEDs). Finally, the SGB: Bi/Na and SGB: Bi/Tb/Eu/Na are respectively, encapsulated with distinct encapsulants via either traditional or remote “capping” packaging strategy to form blue LEDs and wLEDs, showcasing splendid electroluminescence behaviors and luciferous application prospects.
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CERAMICS INTERNATIONAL
·
2026
·
IF 6
Yue Wang,Zhiping Wang,Xin Li,Jiaxin Li,Hao Li,Li-Qian Cheng
The development of dielectric ceramics with high energy storage performance (ESP) is essential for the advancement of high-power capacitors and pulsed-power systems. However, achieving simultaneous improvements in both recoverable energy density ( W rec ) and energy storage efficiency ( η ) remains a significant challenge. In this study, the complementary advantages of the paraelectric CaZr 0.5 Ti 0.5 O 3 (CZT) and Bi 0.5 Na 0.5 TiO 3 (BNT) are first leveraged to synthesize the BNT-CZT (Δ S config = 1.15R), thereby enhancing the relaxor characteristic. Subsequently, K 0.5 Na 0.5 NbO 3 (KNN) is introduced to modulate the configurational entropy (Δ S config ), yielding a series of BNT-CZT- x KNN ( x = 0.05, 0.1, 0.15, 0.2) high-entropy ceramics (Δ S config = 1.57R, 1.77R, 1.89R, 1.96R). This strategy effectively delays polarization saturation, while simultaneously suppressing the remnant polarization ( P r ), thereby achieving superior comprehensive ESP. Δ S config = 1.89R ceramic achieves a high W rec of 5.75 J/cm 3 and η of 79.5%. Furthermore, the material exhibits exceptional thermal and frequency stability, with variation rates maintains below 6.2% and 4.5% across the tested ranges, respectively, while simultaneously demonstrating ultra-fast charge-discharge rates. In summary, this synergistic strategy demonstrates excellent effect in enhancing the comprehensive ESP of BNT-based relaxor ferroelectric ceramics.
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ADVANCED FUNCTIONAL MATERIALS
·
2026
·Vol. 36
·期 61
·e76823
·
IF 19.9
Honglai Li,Xuejia Ma,Zhanfeng Wang,Chang Liu,Xiaoang Li,Mengyu Zhang,Liang Ma,Weihao Zheng,Xiaobing Yan,Anlian Pan
Advanced biometric security systems require photodetectors that not only exhibit strong immunity to environmental interference but also possess the capability to perform intelligent information processing directly at the sensing level. Two-dimensional (2D) materials have emerged as promising candidates for next-generation optoelectronic devices; however, the simultaneous realization of high-performance solar-blind ultraviolet (UV) detection and neuromorphic functionality within a single material platform remains a significant challenge. Here, we report a chemical vapor deposition strategy for the synthesis of 2D BiOBr nanosheets enriched with bismuth vacancies (BiOBr-V Bi ). The resulting cation-deficient nanosheets display a pronounced photoresponse in the solar-blind UV region (265 nm) together with well-defined photonic synaptic plasticity. The introduction of Bi vacancies generates defect-mediated carrier trapping states that induce persistent photoconductivity, thereby enabling synapse-like behaviors such as short-term plasticity and learning-forgetting dynamics. Exploiting this dual functionality, we further establish an optoelectronic computing framework capable of performing fingerprint recognition. Through an optoelectronic reservoir computing architecture, the BiOBr-V Bi -based system achieves an identification accuracy of 99.94% even under 20% noise perturbation. This work highlights defect engineering in 2D BiOBr as a powerful strategy for endowing optoelectronic materials with multifunctional capabilities and presents a compact platform for secure biometric authentication, anti-counterfeiting technologies, and intelligent solar-blind imaging.
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BIOMATERIALS
·
2026
·
IF 13.6
Jianqi Deng,Yuping Zhang,Ke Xiang,Gang Shu,Jiaojiao Wang,Jinbin Pan,Cai Zhang,Dingbin Liu,Xuejun Zhang,Ran Cheng,Shao-Kai Sun
Bismuth chelates represent promising alternatives to clinical iodinated contrast agents for computed tomography (CT) imaging, given their higher X-ray attenuation and favorable safety profiles. However, achieving an optimal balance among imaging performance, physicochemical properties, biosafety, and scalable production remains a major challenge for their potential clinical translation. Herein, we report a scalable synthesis of a bismuth pyclen chelate with superior water solubility, high stability, and low osmolarity for preclinical in vivo CT imaging. Bi-PCTA can be achieved starting from 2,6-pyridinedimethanol through a six-step procedure on a 16-g scale, exhibiting low osmolarity and high stability. Notably, Bi-PCTA featured superior water solubility compared to the developed non-ionic bismuth chelates, which is beneficial for biocompatibility, renal clearance efficiency, and contrast enhancement. In vivo gastrointestinal and renal CT imaging studies in rat models proved its diagnostic capabilities for related diseases. The high K-edge of Bi (91 keV) enabled Bi-PCTA for metal artifact-reducing CT angiography (CTA) in rabbits. Especially, the high water solubility of Bi-PCTA allowed for the successful acquisition of high-quality CTA images in a porcine model, highlighting its strong potential for clinical translation.
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PubMed
高影响因子
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