CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Dongxia Chen,Xiaofei Yan,Mengjie Yang,Xianli Wang,Linjie Fu,Mingyu Li,Zhanjun Yu
ZrP 2 O 7 is a promising material with excellent thermal and electrical properties. However, when temperature approaches to 563 K, it undergoes a structural phase transition, which will cause large thermal stresses. When Zr is substituted by Y and Nb, a new material of (YNb) 0.2 Zr 0.6 P 2 O 7 , was successfully prepared and the phase transition of material was effectively inhibited. This new material adopts a cubic structure similar to ZrP 2 O 7 , and exhibits medium thermal expansion (α = 7.1 × 10 −6 K −1 ) in the measured range of 200–1073 K. The values of thermal conductivity from RT to 973 K are between 0.4474 W m −1 K −1 and 0.8526 W m −1 K −1 , which can be comparable to the values of traditional thermal insulation materials. The dielectric constant and dielectric loss factor at the frequencies above 1 MHz are stable and low. The electrical conductivity of the material indicates that it is electronically insulating at RT-573 K.
研究领域:
材料科学
·
热力学
·
电学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jin Fang,Tao Ni,Minmin Mao,Yu Liu,Huan Liu,Lei Cao,Xueqing Yu,Bing Liu,Hadi Barzegar Bafrooei,Liang He,Yingjie Ren,Fayaz Hussain,Dawei Wang,Kaixin Song
MgSiO 3 ceramics with a low dielectric constant are highly promising for application in 5G communication due to their excellent performance and cost-effectiveness. However, the application remains constrained by phase transitions. This study aims to unlock their full potential by introducing Cu ions to mitigate phase transitions, thereby achieving stable and superior performance. Mg 1- x Cu x SiO 3 (0 ≤ x ≤ 0.25) ceramics were synthesized by solid-state method, and the effects of Cu introduction on the crystal structure, phase constitution, microstructure and microwave dielectric properties were systematically investigated. Through XRD patterns and Rietveld refinement , it was found that when x = 0, both protoenstatite (PEN) and low-temperature clinoenstatite (CEN) phases coexist due to a phase transition from PEN to CEN. As x increases, the PEN phase dominance rises while the CEN phase diminishes, indicating that the addition of Cu ions inhibits the occurrence of phase transition. At x ≥ 0.2, only the orthoenstatite (OEN) phase was observed. SEM and EDS analyses revealed the beneficial impact of Cu introduction on sintering, yet excessive amounts can lead to abnormal grain growth , local segregation, and uneven distribution of Cu elements, thereby deteriorating microwave dielectric properties . The optimal microwave dielectric performance was achieved at x = 0.05: ε r = 6.2, Qf = 93,600 GHz, τ f = −33.7 ppm/°C. A one-year long-term comparative study revealed the stabilizing effect of Cu incorporation for obtaining stable excellent performance. These findings underscore the potential of introducing an appropriate amount of Cu to achieve stable and superior microwave dielectric properties in MgSiO 3 ceramics, paving the way for practical applications in 5G communication.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2024
·Vol. 14
·期 3
·269
·
IF 2.9
Guojie Yang,Chenbing Han,Ying Chen,Fangwei Guo,Jie Lu,Ming Zhou,Lirong Luo,Xiaofeng Zhao
(La0.2Yb0.2Sm0.2Eu0.2Gd0.2)2Zr2O7(HEZ) has shown considerable promise as a novel thermal barrier coating material for temperatures exceeding 1300 °C. This study systematically investigates the interfacial stability of (La0.2Yb0.2Sm0.2Eu0.2Gd0.2)2Zr2O7with yttria-stabilized zirconia (YSZ), which is of paramount importance for its application in double-layer thermal barrier coatings. Our findings highlight that rare earth elements with a smaller radius diffuse more easily into the YSZ lattice, resulting in a broader diffusion zone. Simultaneously, the incorporation of rare earth elements into the YSZ lattice inhibits tetragonal-to-monoclinic phase transformation. Compared to La2Zr2O7/YSZ, HEZ/YSZ demonstrates superior high-temperature stability, which could be attributed to the higher fracture toughness and lower thermal expansion coefficient of HEZ, the absence of t-m transformation and the formation of a continuous gradient diffusion layer that minimizes interface stress. This study offers a practical strategy for designing materials for durable double-layer thermal barrier coating systems.
研究领域:
材料科学
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高温材料
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2024
·Vol. 16
·期 11
·1566
·
IF 4.7
Fengdan Zhu,Chang Liu,Desheng Yang,Guoping Li
The application of hexanitrohexaazaisowurtzitane (HNIW) as an oxidizer in solid propellants aligns with the pursuit of high-energy materials. However, the phase transformation behavior and high impact sensitivity of HNIW are its limitations. Due to the strong adhesion and mild synthesis conditions, polydopamine (PDA) has been employed to modify HNIW. However, the method suffers from a slow coating process and a non-ideal coating effect under short reaction time. Herein, oxygen-accelerated dopamine in situ polymerization coating method was developed. It was found that oxygen not only reduced the coating time but also contributed to forming a dense and uniform PDA layer. HNIW@PDA coated in oxygen for 6 h exhibited the most favorable performance, with a delay of 20.8 °C in the phase transition temperature and a reduction of 145.45% in the impact sensitivity. The -OH groups on the surface of PDA enhanced the interaction between HNIW and polymer binders, resulting in a 20.36% reduction in the dewetting percentage. The lower content of PDA in HNIW@PDA (1.17%) resulted in minimal variation in the heat of explosion for HNIW@PDA-based HTPB propellant (6287 kJ/kg) in comparison to HNIW-based HTPB propellant (6297 kJ/kg). Hence, HNIW@PDA-based propellants are expected to offer an alternative with promising safety and mechanical performance compared to existing HNIW-based propellants, thus facilitating the application of HNIW in high-energy propellants. This work presents a low-cost method for efficiently inhibiting the phase transformation of polycrystalline explosives and reducing the impact sensitivity. It also offers a potential approach to enhance the interfacial interaction between nitro-containing explosives and polymer binders.
研究领域:
材料科学
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化学工程
·
能源与燃料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Energy Storage Materials
·
2023
·
IF 20.4
Bo Peng,Yanxu Chen,Liping Zhao,Suyuan Zeng,Guanglin Wan,Feng Wang,Xiaolei Zhang,Wentao Wang,Genqiang Zhang
The O3-type layered oxides featuring sufficient Na reservoir have been extensively investigated as promising cathode candidates for sodium-ion batteries. However, the complicated phase transitions derived fast capacity decay has severely impeded its practical applications. Herein, we present a scalable yet feasible strategy to tune the local chemical environment in O3-NaNi 0.5 Mn 0.5 O 2 via Al 3+ doping for dramatically enhancing its electrochemical properties. Specifically, the modulated O3-NaNi 0.45 Al 0.1 Mn 0.45 O 2 cathode raises the capacity retention rate from 40.9% to 86.2% within 200 cycles at a current density of 85 mA g −1 . Combining theoretical calculation and experimental characterizations, it is confirmed that the Al 3+ doping induced reinforcement of transition metal-oxygen bonds and enlargement of Na layer distance can simultaneously inhibit the complicated phase transitions and decrease the Na + diffusion energy barrier, which are responsible for the impressive performance improvement. Importantly, the full-cell device based on this unique cathode and commercial hard carbon anode can deliver a high energy density of 213.5 Wh kg −1 , suggesting its great potential of practicability. This work provides a new insight in finely designing high performance layered oxide cathode for sodium ion batteries, which advances the next generation of cost-effective yet grid-level energy storage systems.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2025
·
IF 12.1
Lizhuo Qi,Jing Li,Yuanyuan Liu,Kaihua Liu,Meiri Wang,Hongtao Cui
The behavior transformation of battery-type materials to extrinsic pseudocapacitive behavior is accomplished by suppressing their phase transition. The resulting extrinsic pseudocapacitive materials are a valuable supplement to intrinsic pseudocapacitive materials, enriching the connotation of pseudocapacitive materials. Nevertheless, the research on this category of materials remains inactive as of now, probably due to the as yet unclear phase transition suppression mechanism and the associated electrochemical mechanism. In this work, the battery-type Co(OH) 2 is selected as a research object to create an extrinsic pseudocapacitive material by S 2− doping. It is revealed that the K + intercalation/deintercalation is the essential reason for the phase transition of CoOOH that is irreversibly converted from Co(OH) 2 , leading to its battery-type behavior. Whereas, the fully protonated CoOOH produced due to the high reaction activity of S 2− doped Co(OH) 2 only allows the intercalation/deintercalation of H + . During the process of intercalation/deintercalation of H + , CoOOH retains the P3 structure, thereby giving rise to extrinsic pseudocapacitive behavior. The electrochemical measurement results indicate that this extrinsic pseudocapacitive material and the assembled device have electrochemical performance equivalent to that of intrinsic pseudocapacitive materials.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 28
·14943-14953
·
IF 14.511
Kanghui Tian,Huan He,Xiao Li,Dan Wang,Zhiyuan Wang,Runguo Zheng,Hongyu Sun,Yanguo Liu,Qinchao Wang
Complex phase transitions induced by interlayer slides in layered cathode materials lead to poor cycling stability and rate capability for sodium-ion batteries. Herein, we design and prepare a new six-component high-entropy oxide (HEO) layered cathode O3–Na(Fe0.2Co0.2Ni0.2Ti0.2Sn0.1Li0.1)O2 to enable highly reversible electrochemical reaction and phase-transition behavior. The HEO cathode exhibits good cycling performance (capacity retention of ∼81% after 100 cycles at 0.5C) and outstanding rate capability (capacity of ∼81 mA h g−1 at 2.0C) due to the higher sodium diffusion coefficient (above 5.75 × 10−11 cm2 s−1) than most reported O3-type cathodes. Moreover, the high-entropy cathode has superior compatibility with the hard carbon anode and delivers a specific capacity of 90.4 mA h g−1 (energy density of ∼267.5 W h kg−1). Ex situ X-ray diffraction proves that the high-entropy designing effectively suppresses the intermediate phase change to achieve reversible O3–P3 phase evolution, and in turn stabilizes the layered structure. X-ray absorption spectroscopy and Mössbauer spectrum of 57Fe suggest that Ni2+/Ni3.5+, Co3+/Co3.5+, and part of Fe3+/Fe3.5+ redox reaction contribute the charge compensation. The enhanced performance can be attributed to the disordered distribution of multi-component transition metals in HEO suppressing the ordering of electric charges and sodium vacancies, thereby inhibiting the interlayer slide and phase transition.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Nano
·
2023
·
IF 17.1
Shiyong Chu,Caoyang Shao,Jiaming Tian,Jingyang Wang,Yuan Rao,Chengrong Xu,Haoshen Zhou,Shaohua Guo
Layered oxides are widely accepted to be promising cathode candidate materials for K-ion batteries (KIBs) in terms of their rich raw materials and low price, while their further applications are restricted by sluggish kinetics and poor structural stability. Here, the high-entropy design concept is introduced into layered KIB cathodes to address the above issues, and an example of high-entropy layered K0.45Mn0.60Ni0.075Fe0.075Co0.075Ti0.10Cu0.05Mg0.025O2 (HE-KMO) is successfully prepared. Benefiting from the high-entropy oxide with multielement doping, the developed HE-KMO exhibits half-metallic oxide features with a narrow bandgap of 0.19 eV. Increased entropy can also reduce the surface energy of the {010} active facets, resulting in about 2.6 times more exposure of the {010} active facets of HE-KMO than the low-entropy K0.45MnO2 (KMO). Both can effectively improve the kinetics in terms of electron conduction and K+ diffusion. Furthermore, high entropy can inhibit space charge ordering during K+ (de)insertion, and the transition metal–oxygen covalent interaction of HE-KMO is also enhanced, leading to suppressed phase transition of HE-KMO in 1.5–4.2 V and better electrochemical stability of HE-KMO (average capacity drop of 0.20%, 200 cycles) than the low-entropy KMO (average capacity drop of 0.41%, 200 cycles) in the wide voltage window.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Nano
·
2024
·
IF 15.8
Qi Wang,Guihui Yu,Bi Luo,Weijie Ji,Zihang Liu,Minghuang Li,Yutong Nong,Yi Tian,Xiaowei Wang,Jiafeng Zhang,Chi-Liang Chen,Chung-Kai Chang,Zhiyuan Sang,Zaowen Zhao,Ruirui Zhao,Ji Liang
Advancing the high-voltage stability of the O3-type layered cathodes for sodium-ion batteries is critical to boost their progress in energy storage applications. However, this type of cathode often suffers from intricate phase transition and structural degradation at high voltages (i.e., >4.0 V vs Na+/Na), resulting in rapid capacity decay. Here, we present a Li/Ti cosubstitution strategy to modify the electronic configuration of oxygen elements in the O3-type layered oxide cathode. This deliberate modulation simultaneously mitigates the phase transitions and counteracts the weakening of the shielding effect resulting from the extraction of sodium ions, thus enhancing the electrostatic bonding within the TM layer and inducing and optimizing the O3–OP2 phase transition occurring in the voltage range of 2.0–4.3 V. Consequently, the cosubstituted NaLi1/9Ni1/3Mn4/9Ti1/9O2 exhibits an astounding capacity of 161.2 mAh g–1 in the voltage range of 2.0–4.3 V at 1C, and stable cycling up to 100 cycles has been achieved. This work shows the impact mechanism of element substitution on interlayer forces and phase transitions, providing a crucial reference for the optimization of O3-type materials.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·Vol. 46
·期 2
·117772
·
IF 6.2
Jingdan Lei,Chunhui Wang,Xiaoyun Yang,Xiwei Zhang,Di Yuan,Xu-Jin Ge,Shike Zhang,Gui Yang,Chao Wang
AgCuTe has attracted significant interest due to their superior electrical and thermal transport characteristics. In this work, we focuses on investigating the effects of Se and S solid solution on AgCuTe thermoelectric properties. A series of AgCu(Te, Se, S) solid solutions were synthesized via melting reaction. We found these compositions effectively inhibited the typical hexagonal-to-cubic phase transition and showed features of secondary phase segregation, such as Ag 2 Te, Cu 2 Te, and Cu 2 S. These nano- to microscale chemistry fluctuations significantly affect the thermoelectric transport properties, particularly thermal transport, resulting in an exceptional low lattice thermal conductivity of 0.19 W m −1 K −1 , which was approaching the amorphous limits. Consequently, a maximum figure of merit zT up to 1.4 was obtained at 723 K for AgCuTe 0.65 Se 0.1 S 0.25 sample. This work investigates the relationships between composition, structure, and thermoelectric properties of AgCuTe, providing substantial support for the further development of high-performance AgCuTe-based materials.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Feng Li,Yuhang Tian,Yanyun Sun,Peiyu Hou,Xianqi Wei,Xijin Xu
High-voltage and low-cost manganese-based P 2-type oxides show real promise as promising cathode for sodium-ion batteries (SIBs). But the P 2 − O2 phase transformation and Na + /vacancy ordering results in the inferior structural stability and Na + diffusion coefficient , which further leads to rapid decay of capacity and poor rate capability. Herein, in consideration of the synergetic effects of dual cationic doping, electrochemically inactive Li + and active Co 3+ codoping are proposed to solve the above issues. The novel two-step doping strategy, Co doping during synthesis of precursors via coprecipitation reaction followed by Li doping during solid-state reaction, are rationally developed. As anticipated, the Li/Co codoped P 2-type oxide exhibits the absence of P 2 − O2 phase transformation and Na + /vacancy disordering, which gives rise to an outstanding cycling stability (86.7% capacity retention within 100 cycles at 0.1C) and high-rate capability (reversible capacity of 109 mAh g −1 even at 10C). In addition, the full-cells composed of the codoped P 2-type positive and hard carbon negative show high energy-density, good lifespan and high-rate property. This proposed cationic codoping provides an effective and scalable tactics for modulating the structural properties of high-voltage P 2-type cathodes for advanced SIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Hao Zhang,Zhen Teng,Yiwang Bao,Man Jiang,Qingguo Feng,Chunfeng Hu
Oxide ceramic aerogels, one of the most important aerogels, hold significant application promise in thermal insulation and protection. However, their low strength, long preparation cycle, and supercritical drying dependence hinder their widespread use. In this study, we proposed a hybrid interpenetrating network strategy and prepared a hybrid Al 2 O 3 -SiO 2 aerogel (PAS) via ambient pressure drying. The structures, mechanical properties, thermal insulation performance, and mechanisms of PAS were systematically investigated. PAS exhibited remarkably low drying linear shrinkage (6.08%), substantially compressive strength (8.05 MPa), and impressive strain capacity (45%). Furthermore, PAS demonstrated exceptional thermal insulation (0.039 W/m·K at 25°C) and high-temperature structural stability. Mechanistic studies revealed that the hybrid interpenetrating network significantly reinforced the Al 2 O 3 -SiO 2 network, and inhibited the phase transition of Al 2 O 3 -SiO 2 in high-temperature. This study provides a reproducible approach for the rapid preparation of high-strength, low-thermal conductivity oxide ceramic aerogels and demonstrates its promising application potential in thermal protection.
研究领域:
材料科学
·
陶瓷材料
·
热工工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）