CHEMOSPHERE
·
2022
·
IF 8.943
Zhenzhen Yao,Xiaoman He,Qian Wang,Chao Wang,Qing Shi,Qiwu Zhang
This study explored a possible destruction of hexachlorobenzene (HCB) as example of persistent organic pollutants (POPs) as well as the dechlorination mechanism by directly using minerals in the soil, such as antigorite , talc and olivine. Compared with a stable quartz phase of SiO 2 , all three Mg silicate minerals demonstrated certain degrading capacity for HCB with different efficiency order as: antigorite > talc > olivine > SiO 2 at 2 h of milling time. Interestingly, olivine exhibited a better performance than antigorite at 4 h of milling time, giving destruction percentage of 92.7% over 89.0% even at high concentrated HCB up to 5% added. Raman and ESR characterizations of the ball milled sample with olivine indicated the formation of amorphous carbon and graphitic carbon, and the occurrence of free radicals was observed to play an important role in dechlorination and carbonization of HCB. The first identified effectiveness of directly using Mg silicate minerals, allowed no addition of active chemicals during the ball milling, therefore avoided the concern over extrinsic contaminations on the soil. Olivine was further utilized to deal with actual contaminated soil and showed unique advantages on application prospects.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POWDER TECHNOLOGY
·
2020
·
IF 4.142
Zhenggen Liu,Lifeng Zhang,Mingyu Wang,Zichuan Zhao,Lihua Gao,Mansheng Chu
A new understanding of the reduction mechanisms of ferruginous manganese ores for ferromanganese alloy smelting was reported, and this new understanding was used to produce excellent ferromanganese alloys. To fulfill this objective, the effects of the operating variables on smelting ferromanganese alloys were initially investigated. The formation mechanisms and reduction reaction behaviors of olivine (Ca x Fe y Mn 2-x-y )SiO 4 , spinel (Ca x Fe y Mn 1-y-x )Al 2 O 4 , gehlenite (Ca x Mn 2-x )SiAl 2 O 7 and wüstite Mn x Fe y Ca 1-x-y O systems were systematically discussed to understand the phase transformation and reconstruction of manganese ore at high temperatures. The spinel (Ca x Fe y Mn 1-y-x )Al 2 O 4 that originated from (Fe y Mn 1-y )Al 2 O 4 was converted to CaAl 2 O 4 and then further reduced to ferromanganese alloys. A similar expression was applied to describe how the reduction mechanism of olivine (Ca x Fe y Mn 2-x-y )SiO 4 that originated from (Fe y Mn 2-y )SiO 4 was converted to Ca 2 SiO 4 . In addition, the importance of the formation of gehlenite (Ca x Mn 2-x )SiAl 2 O 7 and wüstite Mn x Fe y Ca 1-x-y O phases in smelting ferromanganese alloys was discussed and clarified in detail. Based on the findings, recommendations are provided for the theoretical basis and technical support of smelting ferromanganese alloys.
研究领域:
冶金学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 21
·1-13
·
IF 2.8
Su Congxue,Tao Wenlong,Chen Lianchun,Che Haiyan,Wang Ruijuan,Fan Jun,Qin Xingliu,Chen Zhilin,Fang Liang
Orthorhombic olivine-structured LiTmRO 4 (R = Si, Ge) ceramics were synthesized using a solid-state reaction. Promising microwave dielectric properties of ε r = 8.18, τ f = 13.7 ppm/°C and a high-quality factor ( Q × f ) of 24,274 GHz for LiTmSiO 4 were obtained at 1130 °C, and ε r = 8.67, τ f = − 24.4 ppm/°C and Q × f = 19,231 GHz for LiTmGeO 4 were achieved at 1090 °C. According to the bond valence results, Tm 3+ and Ge 4+ presented a compressed state, but Li + exhibited a strong rattling state in LiTmGeO 4 , which led to a higher ε r than ε theo . The integrated effect of the rattling cations (Li + and Si 4+ ) and a compressed cation (Tm 3+ ) in LiTmSiO 4 resulted in a smaller positive deviation ∆ ε r . The larger packing fraction of LiTmSiO 4 contributed to a higher Q × f than that of LiTmGeO 4 . The R–O bond in both ceramics played a leading role in influencing Q × f according to the Phillips–Van Vechten–Levine chemical bond theory.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Yulei Wang,Ruotong Li,Bin Feng,Tao Long,Kairong Wang,Qinqin Yu,Zuyong Wang,Yuan-Li Ding
Fast charging and all-climate electrochemical behaviors are two of the most important issues of olivine cathodes for lithium ion batteries (LIBs) owing to inferior Li + and electron conduction at a high current density or low temperature. Taking Mn-containing olivine cathode (LiFe 0.8 Mn 0.2 PO 4 , LFMP) as an example, herein, we report a facile interconnected, hierarchically porous and highly conductive framework design strategy to construct an advanced bulk LFMP@graphene hybrid, realizing superior fast charging capability and wide temperature performance (−20∼80 °C). Such hybrids not only offer well-interconnected and highly conductive graphene networks, but also possess hierarchical porous interiors where the former ensures high-efficiency charge transfer between active components while the latter facilitates Li + diffusion. Benefiting from these advantages, the obtained hybrids deliver superior rate capability (85.0 mAh g −1 up to 20C) and high capacity retentions of 94.1 % after 3000 cycles at 10C (50 °C), and 91.7 % after 500 cycles at 5C (80 °C), and 93.6 % after 1300 cycles at 1C (−20 °C). This work provides an efficient strategy to design practical olivine cathode at the material level for fast charging and all-climate LIBs.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Yi-Bing Zhang,Jin Wang,Jun-Xia Wang,Yi Huang,Ping Luo,Xiao-Feng Liang,Hong-Bin Tan
In order to ascertain the structural relationship of zirconolite and pyrochlore for their potential application in HLW immobilization, the Gd-doped zirconolite-pyrochlore composite ceramics (Ca 1- x Zr 1- x Gd 2 x Ti 2 O 7 ) were systematically synthesized with x = 0.0–1.0 by traditional solid-phase reaction method. The phase evolution and microstructure of the as-prepared samples have been elucidated by XRD and Rietveld refinement , Raman spectroscopy , BSE-EDS and HRTEM analysis. The results showed that zirconolite-2M, zirconolite-4M, perovskite and pyrochlore, four phases were identified in Ca 1- x Zr 1- x Gd 2 x Ti 2 O 7 system and could be coexisted at x = 0.4 composition. With the increase of Gd 3+ substitution, the phase evolution was followed by zirconolite-2M→zirconolite-4M→pyrochlore. It is illustrated that the phase transformation from zirconolite-2M to zirconolite-4M was promoted by the preferential substitution of Gd 3+ for Ca 2+ . And the solubility of Gd 3+ in zirconolite-2M, zirconolite-4M and pyrochlore increased in sequence. The chemical stability test was also measured by the PCT leaching method. The normalized elemental release rates of Ca, Zr, Ti and Gd in Ca 1- x Zr 1- x Gd 2 x Ti 2 O 7 system were fairly low and in the range of 10 −6 −10 −8 g m −2 d −1 , which indicated a potential ceramics composite ensemble of CaZrTi 2 O 7 -Gd 2 Ti 2 O 7 system for nuclear HLW immobilization.
研究领域:
材料科学
·
核能工程
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Kui Liu,Huaiwu Zhang,Cheng Liu,Jie Li,Liang Shi,Xueying Wang,Dainan Zhang
Novel (Mg 0.2 Ni 0.2 Zn 0.2 Co 0.2 Mn 0.2 ) 2 SiO 4 (A5SO) high-entropy microwave dielectric ceramics with olivine structure were prepared in the sintering temperature range of 1100 °C–1300 °C via the solid-phase reaction route. The crystal structure was confirmed by XRD , Raman, and Rietveld refinement . Optimal microwave dielectric properties ( ε r = 8.02, tan δ = 0.00051 at 14.5 GHz, and τ f = −38.2 ppm/°C) were obtained at the sintering temperature of 1250 °C, where a relative density of 95.1% was detected. The complex chemical bonding theory manifests that the ε r value of A5SO is mainly affected by the ionicity of A-O (A = Mg, Ni, Zn, Co, Mn) bond, while the dielectric loss is affected by both A-O and Si–O lattice energy. The τ f value is mainly influenced by the [A(2)O 6 ] oxygen octahedral distortion (1.8 × 10 −3 ). The experimental results of this study provide both theoretical and practical guidance for high-entropy microwave dielectric ceramic applications.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Bin Yang,Haoran Sun,Donghui Wang,Wanzhong Yin,Shaohang Cao,Yulian Wang,Zhanglei Zhu,Kai Jiang,Jin Yao
Up to now, there is still a great challenge to efficiently separate magnesite from calcium-bearing carbonate minerals, especially dolomite, via froth flotation owing to their similar physicochemical properties. In this investigation, a novel depressant adenosine 5′-triphosphate disodium salt (Na 2 ATP) was introduced into the flotation process using the collector sodium oleate (NaOl), which was proved to be effective for the separation of dolomite and magnesite. The flotation results demonstrate that Na 2 ATP exhibits a more intense depression on the flotation of dolomite than that of magnesite and can separate effectively magnesite from dolomite, which depends on much less NaOl adsorption onto dolomite in the presence of Na 2 ATP. Zeta-potential detection and adsorption amount tests illustrate that the pre-addition of Na 2 ATP strongly interferes with the interaction between NaOl and dolomite so that a more significant reduction in adsorption of NaOl on the surface of dolomite in comparison with magnesite. Moreover, infrared spectral (IR) and X-ray photoelectron spectroscopy (XPS) measurements further confirm that the depressant Na 2 ATP is adsorbed more strongly onto dolomite than magnesite. And the selective adsorption of Na 2 ATP onto dolomite rather than magnesite was mainly due to the strong bonding of its phosphate groups and the calcium sites only exposed to the dolomite surface, resulting in selectively depressing the flotation of dolomite.
研究领域:
矿物学
·
化学工程
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2025
·
IF 5.7
Weitong Li,Haoyi Wu,Yahong Jin
Broadband shortwave infrared (SWIR) light sources have become increasingly significant in various fields such as industrial monitoring, food testing, biomedical imaging, and environmental sensing. However, creating a reliable and efficient SWIR light sources remains a great challenge. One promising approach involves using SWIR phosphor-converted light emitting diodes (pc-LEDs), which leverage blue LED chips coated with SWIR-emitting phosphors. In this study, we describe a Cr 3+ -doped Li(In 1-x Sc x )GeO 4 olivine solid-solution phosphor that can be excited by blue light to produce broadband SWIR emission. By adjusting the ratio of Sc 3+ and In 3+ , the peak emission can be tuned from 1115 nm to 1155 nm, while the full width at half-maximum (FWHM) can be modified from 309 nm to 330 nm. The Sc 3+ /In 3+ ratio is optimized to be 3:17, at which a highest quantum efficiency (IQE) of 28.11% and an improved luminescence thermal stability are achieved. By integrating the title phosphor with a commercial blue InGaN LED chip, a prototype SWIR pc-LED that emit across the 780–1600 nm range with a SWIR output power of 4.4 mW at a driving current of 100 mA and photoconversion efficiency (PCE) of 8.23%@10 mA is fabricated. This work on Cr 3+ -doped olivine solid solution provides a strategy to design efficient SWIR phosphors for solid-state SWIR pc-LEDs and demonstrates potential applications in night-vision and optical imaging.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Thermal Science
·
2025
·
IF 2.6
Liu Wenyuan,Liu Hao,Wang Zhoufu,Ma Yan,Gu Jianming,Wang Xitang
The improvement of composite phase change materials in energy storage density and thermal conductivity is significant for the efficient use of energy. This study proposed novel composite materials based on forsterite with high specific heat as matrix materials, chloride salts (NaCl-KCl) with high latent heat as phase change materials and SiO 2 nanoparticles as fillers. The results indicated that forsterite and chloride salts exhibited excellent chemical compatibility, and the composite materials containing 40% (in weight) chloride salts achieved an energy storage density of 882.5 J/g within the range of 100°C to 800°C, a latent heat of 108.1 J/g, and a thermal conductivity of 0.68–0.81 W/(m·K) at 300°C–500°C. Furthermore, the addition of SiO 2 enhanced the thermal conductivity and energy storage density of composite materials due to the formation of unique nanostructures. More importantly, the removal of structural water during heat-treatment process resulted in the formation of micropores and increased specific surface area of forsterite particles, which facilitated the adsorption and stabilization of molten chloride salts. Combined with the stabilization effect of forsterite and synergistic effect of SiO 2 nanoparticles, the obtained composite materials with 2.0% (in weight) SiO 2 nanoparticles exhibited good thermal stability with 1.80% weight loss and 2.34% reduction in latent heat after 150 cycles, indicating a promising application in high-temperature thermal energy storage.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 103
·期 3
·1789-1797
·
IF 3.094
Junqi Chen,Ying Tang,Changzhi Yin,Mingyang Yu,Huaicheng Xiang,Chunchun Li,Xianran Xing,Liang Fang
An ultra-low dielectric loss ceramics Mg 2 Ge 0.98 O 4 with olivine structure was fabricated by conventional solid-state route. The phase composition, crystal structure, and microwave dielectric properties were investigated. The phase of Mg 2 Ge 0.98 O 4 is formed to the orthorhombic forsterite structure with a space group Pmnb (62). The dense microstructure and excellent microwave dielectric properties of Mg 2 Ge 0.98 O 4 ceramic were obtained at 1360°C for 4 hours, with relative density ~96.4%, ε r ~ 7.3, Q × f = 112 400 GHz, and τ f ~ −64.6 ppm/°C. The conductive mechanism of Mg 2 Ge 0.98 O 4 in the low frequency (<1 MHz) was studied by the dielectric spectroscopy and the result with E dc = 0.93 eV demonstrates that the defect was contributed to the double ionized oxygen vacancies. The intrinsic dielectric properties of Mg 2 Ge 0.98 O 4 in the microwave region were obtained by infrared reflectivity spectra with ε r ~ 7.13, Q × f = 120 400 GHz. And, acceptable τ f (~+2.6 ppm/°C) of 0.92Mg 2 Ge 0.98 O 4 –0.08CaTiO 3 composite ceramic was obtained by adding the CaTiO3.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
CLAYS AND CLAY MINERALS
·
2025
·
IF 2.1
Li Li,Guanzheng Zhuang,Yanfu Wei,Mohammad Fahimizadeh,Peng Yuan
Sepiolite is considered a suitable substrate for Maya blue pigment. However, the interaction between sepiolite and indigo dye has not been fully understood. Previous studies have demonstrated that pre-treatment of sepiolite by heating or acid was useful in identifying the sepiolite–indigo interaction. The purpose of the present study was to prepare a series of hybrid sepiolite–indigo pigments after modifying the sepiolite using various alkali treatments (NaOH), then to evaluate their properties with respect to color, chemical resistance, and photostability. Samples were characterized using reflectance spectroscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, Raman spectroscopy, transmission electron microscopy, and N2 adsorption-desorption. Under alkaline conditions, Si4+ and Mg2+ ions in sepiolite partially dissolved, disrupting the coordinated water associated with them. Mg2+ ions precipitated and blocked the structural channels of the sepiolite. The impact of the alkali treatment on the microporous structure and coordinated water of sepiolite significantly influenced the color properties and stability of the hybrid pigments. Proper alkaline treatment enhanced the greenish hue and chemical stability of the pigment, while severe treatments apparently compromised the structural integrity of the sepiolite, thus diminishing the quality of the hybrid pigment. Results from this study provide new insights into the color-causing and stabilizing mechanisms of sepiolite-based Maya blue pigment and also provide guidance for developing hybrid pigments based on clay minerals and organic dyes.
研究领域:
材料科学
·
考古化学
·
矿物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PETROLOGY
·
2025
·Vol. 66
·期 9
·
IF 3.5
Liu Zairong,Chou I-Ming,Ta Kaiwen,Li Zhongjuan,Wang Yu,Klemme Stephan
Kimberlite magmatism provides critical information about the mineralogical and chemical composition of the deep mantle and geodynamic processes within the deep lithosphere and upper asthenosphere. Understanding the fractional crystallization processes of kimberlite magma after separation from its source and before emplacement is essential for quantifying the degassing of kimberlite magmas, which is responsible for their explosive eruption styles. While mineral fractionation has been proposed to explain compositional variations in the evolved aphanitic kimberlites, the mineral assemblages and the extent of crystallization during magma transport remain poorly constrained. In this study, we conducted a series of experiments with the proposed primary kimberlitic magma composition at 3.0–2.0 GPa and 1200–900 °C, under both graphite-saturated reducing conditions and nickel–nickel oxide (NNO)-buffered oxidizing conditions in a piston-cylinder apparatus. This study presents the first experimental investigation into the effects of redox conditions on the fractional crystallization of kimberlite magma. Our results show that olivine crystallizes under all conditions studied, followed by clinopyroxene with decreasing temperature. Orthopyroxene is stabilized under reducing conditions at 3.0–2.4 GPa. Phlogopite, rutile, magnesian ilmenite, and apatite crystallize after clinopyroxene under both redox conditions, while carbonates (mainly dolomite) are observed only under oxidizing conditions in the absence of melt and at temperatures ≤1000 °C. The crystallization of magnesian ilmenite occurs mainly under oxidizing conditions, indicating that its presence in kimberlite does not imply diamond-preserving reducing conditions. Our study shows that, as the temperature of kimberlite magma decreases to and below 1200 °C, olivine ± pyroxene fractionation becomes increasingly significant, and low oxygen fugacity promotes a higher extent of crystallization. This silicate-dominated fractional crystallization could account for the formation of aphanitic kimberlites from Kimberley and Uintjiesberg, South Africa. The residual melt after fractionation is a transitional carbonate–silicate melt and becomes progressively depleted in SiO2 and evolves toward carbonatitic compositions with decreasing temperature, irrespective of redox conditions, which may explain the co-occurrence of carbonatite and kimberlite in the Premier pipe, South Africa. Our experiments confirm that oxygen fugacity strongly controls the stability of carbonates and transitional melts, with transitional melts stable at lower oxygen fugacity than carbonates. Progressive oxidation during magma cooling facilitates promotes the full complete crystallization of kimberlite magma, which may potentially resulting inform the formation of intrusive kimberlite bodies within the lithospheric mantle.
研究领域:
岩石学
·
地球化学
·
实验地球科学
·
矿物学
·
火山学
·
地幔动力学
✓ 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）