JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Yanfei Fan,Ziyu Zhuang,Dandan Gao,Dongdong Li,Dewen Zeng
Solid–liquid phase equilibrium data of the Li2SO4 + Rb2SO4 + H2O and Li2SO4 + Cs2SO4 + H2O systems are of importance for the design of alkali metal element extraction processes from sulfate leaching solution of lepidolite. Considering the serious inconsistency of the reported solid phases, especially double salts and solid solutions, phase diagrams of the two systems were reinvestigated experimentally. The results on the Li2SO4 + Rb2SO4 + H2O system at 298.15 K show five solids, i.e., Rb2SO4, Rb2SO4·Li2SO4, Rb2SO4·3Li2SO4·2H2O, Rb2SO4·5Li2SO4·4H2O, and a solid solution with the end members Rb2SO4·5Li2SO4·4H2O and Li2SO4·H2O. For the Li2SO4 + Cs2SO4 + H2O system at 298.15 K, the results also show five solids, i.e., Cs2SO4, Cs2SO4·Li2SO4, Cs2SO4·3Li2SO4·2H2O, Cs2SO4·5Li2SO4·4H2O, and Li2SO4·H2O, while there is no solid solution phase with the end members Cs2SO4·5Li2SO4·4H2O and Li2SO4·H2O. Moreover, the single crystal structures of Rb2SO4·3Li2SO4·2H2O and Cs2SO4·3Li2SO4·2H2O were determined.
研究领域:
化学工程
·
材料科学
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高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2019
·
IF 2.29
Yanfei Fan,Dongdong Li,Dandan Gao,Dewen Zeng,Wu Li
Specific heat capacity of Rb 2 SO 4 (aq) and Cs 2 SO 4 (aq) solutions was determined using a Calvet-type calorimeter from 288.15 K to 338.15 K and from about 0.25 mol·kg −1 to concentration near room temperature solubility limits. For both Rb 2 SO 4 (aq) and Cs 2 SO 4 (aq) solutions, the specific heat capacity decreases with the increase of molality at constant temperature. Combining the heat capacity data determined in this study and other thermodynamic properties ( i.e. water activity, osmotic coefficient, mean ionic activity coefficient, enthalpy of dilution and solubility) reported in literature, thermodynamic and phase equilibria properties of the binary Rb 2 SO 4 + H 2 O and Cs 2 SO 4 + H 2 O systems were modelled using a comprehensive thermodynamic framework, in which a Pitzer-Simonson-Clegg model was applied to represent the non-ideality of aqueous phases. The models can represent all the properties over wide temperature and concentration ranges. This study forms a basis for solubility prediction in multi-component systems containing Rb and Cs sulfates.
研究领域:
物理化学
·
热力学
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高影响因子
CHEMISTRY OF MATERIALS
·
2025
·
IF 7
Luyong Zhang,Zhencheng Wu,Jingdong Yan,Shibin Wang,Zilong Chen,Zhihua Yang,Fangfang Zhang,Shilie Pan
Sulfates have remained promising candidates for deep-ultraviolet (DUV) optical crystals owing to the inherently wide bandgaps induced by the [SO4] tetrahedral groups. However, the structural rigidity of [SO4] tetrahedra imposes severe restrictions on the polarization anisotropy, fundamentally preventing sulfates from achieving sufficient birefringence required for regulating light polarization. Herein, by incorporating f0 rare earth metal cation Y3+ into alkali metal sulfates, we synthesized six compounds, AY(SO4)2 and A3Y(SO4)3 (A = K, Rb, Cs). They exhibit dramatically enhanced birefringence between 0.013–0.056 at 546 nm, with up to 25 times that of their parent alkali metal sulfates, which originate from the highly aberrant Y–O polyhedra and the dimensionality reduction of the Y–O–S network regulated by A-site cations. This study provides valuable insights into the further exploration of sulfate-based optical materials.
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Materials
·
2025
·Vol. 18
·期 12
·2871
·
IF 3.2
Yi Wang,Zilong Zhang,Ze Wang,Yujie Yan,Tong Feng,An Xie
Electrochromic devices have garnered significant interest owing to their promising applications in smart multifunctional electrochromic energy storage systems (EESDs) and their emerging next-generation electronic technologies. Tungsten oxide (WO3), possessing both electrochromic and pseudocapacitive characteristics, offers great potential for developing multifunctional devices with enhanced performance. However, achieving an efficient and straightforward synthesis of WO3electrochromic films, while simultaneously ensuring high coloration efficiency and energy storage capability, remains a significant challenge. In this work, a low-temperature hydrothermal approach is employed to directly grow hexagonal-phase WO3films on FTO substrates. This process utilizes sorbitol to promote nucleation and rubidium sulfate to regulate crystal growth, enabling a one-step in situ fabrication strategy. To complement the high-performance WO3cathode, a composite PB/SnO2film was designed as the anode, offering improved electrochromic properties and enhanced stability. The assembled EESD exhibited fast bleaching/coloration response and a high coloration efficiency of 101.2 cm2C−1. Furthermore, it exhibited a clear and reversible change in optical properties, shifting from a transparent state to a deep blue color, with a transmittance modulation reaching 81.47%.
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PubMed
高影响因子
HYDROMETALLURGY
·
2025
·
IF 5.3
Yanfei Fan,Dandan Gao,Dongdong Li,Dewen Zeng
Alum is an important intermediate for the extraction and purification of Cs or Rb chemicals, due to its excellent separation ability for Cs, Rb and K. Although the solubility sequence K-alum > Rb-alum > Cs-alum has been well known, the separation factors among Cs, Rb and K during the formation of alum have not been determined. The formation of solid solution of alum controls the Cs or Rb content and Cs/Rb/K ratio in the sequentially precipitated Cs, Rb and K alums. In this study, the thermodynamic equilibrium separation factors were determined from the solid solution-aqueous solution equilibrium data of the two mixed alum systems: (i) RbAl(SO 4 ) 2 , CsAl(SO 4 ) 2 , and H 2 O, and (ii) KAl(SO 4 ) 2 , RbAl(SO 4 ) 2 and H 2 O. The separation factor β Cs/Rb varied from 48 to 2 with the increase of the Rb/Cs ratio in system (i), and β Rb/K varied from 22 to 0.2 with the increase of the K/Rb ratio in system (ii). This suggests that the purification of Cs or Rb using alums is more efficient from raw materials containing high Cs/Rb or Rb/K ratio than that from low Cs/Rb or Rb/K ratio. In kinetic studies, the apparent separation factors β Cs/Rb and β Rb/K were highly affected by the recrystallization process of cooling or non-cooling and the initial composition of raw alum, showing asymmetric kinetic intensification. The separation factors β Cs/Rb or β Rb/K obtained in the “dissolution by heating and crystallization by cooling (DHCC)” process for the raw alum with high initial Cs/Rb or Rb/K molar ratio is several times larger than the equilibrium value expected from thermodynamics. Finally, CsAl(SO 4 ) 2 and RbAl(SO 4 ) 2 with a metal-based purity of 99.97 % and 99.94 %, respectively, were obtained by using the DHCC process 3–4 times.
研究领域:
化学工程
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材料科学
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JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Wencheng Lu,Yaoguo Shen,Qiong Wu
The SO 4 tetrahedral group exhibits a low degree of polarization anisotropy, leading to a minimal level of birefringence of sulfates. Our report introduces a novel sulfate compound, RbY(SO 4 ) 2 ·4H 2 O, which exhibits exceptional birefringence in deep ultraviolet sulfates. This crystal possesses dimensions of 6 mm × 4 mm × 1 mm and was synthesized using a straightforward technique involving the evaporation of an aqueous solution. The structure of this substance is characterized by a unique arrangement of SO 4 tetrahedra YO 9 polyhedra, and H 2 O molecules. Each SO 4 moiety contribution two oxygen atoms to share edges with a neighboring YO 9 polyhedron, resulting in significant deformation of these groups. The unique arrangement of edge-sharing arrangement in RbY(SO 4 ) 2 ·4H 2 O results in a birefringence of about 0.045@546 nm. This sets a new record for sulfates in the deep ultraviolet range that have similar non-π-conjugated anionic groups. We elucidate UV–Vis–NIR diffuse-reflection, IR spectra, transmission spectra, and conduct theoretical calculations. These fascinating discoveries will improve our understanding of sulfates and provide valuable insights for studying deep-UV sulfates with strong birefringence.
研究领域:
材料科学
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晶体学
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DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2026
·
IF 7.1
Luyong Zhang,Jianyi Zuo,Guangsheng Xu,Jinbin Fan,Xue Bai,Zhihua Yang,Fangfang Zhang,Shilie Pan
Deep-ultraviolet (DUV) birefringent crystals are essential for modern optical technologies, yet achieving a balance between large birefringence and a wide bandgap remains challenging. Although conventional borosulfates with alternating [BO4] and [SO4] tetrahedra connected by sharing corners possess a wide bandgap, they suffer from small birefringence due to weak optical anisotropy resulting from the presence of only tetrahedral groups. This work introduced advantageous “genes” [BO2(OH)] groups to modify the common [B(SO4)4] supertetrahedra for the first time and ultimately produced two borosulfates, Na3B3S2O11(OH)2 and K3B3S2O11(OH)2, striking the balance. Isolated fundamental building block (FBB) [B3O3(OH)2(SO4)2] was observed in the two compounds. Additionally, three conventional borosulfates featuring isolated [B(SO4)4] supertetrahedra, Na4KB(SO4)4, Na4RbB(SO4)4, and Na3Cs2B(SO4)4, were also obtained for comparison. Structural analysis and theoretical calculations reveal that the directional alignment of [BO2(OH)] groups significantly enhances the birefringence of the borosulfates. The calculated birefringence at 1064 nm increases by approximately 10-fold, specifically from 0.0035–0.0047 for the three conventional borosulfates to 0.043–0.044 for the two hydroxylated ones. This work demonstrates the effectiveness of employing [BO2(OH)] groups in optimizing the optical anisotropy of borosulfates, providing a design paradigm for exploring advanced DUV birefringent materials in borosulfates.
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高影响因子
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2019
·Vol. 645
·期 10
·745-751
·
IF 1.337
Xiaofang Li,Yuandong Wu,Dajiang Mei,Thomas Doert
Three new alkali metal transition metal sulfate-oxalates, RbFe(SO 4 )(C 2 O 4 ) 0.5 · H 2 O and Cs M (SO 4 )(C 2 O 4 ) 0.5 · H 2 O ( M = Mn, Fe) were prepared through hydrothermal reactions and characterized by single-crystal X-ray diffraction, solid state UV/Vis/NIR diffuse reflectance spectroscopy, infrared spectra, thermogravimetric analysis, and powder X-ray diffraction. The title compounds all crystallize in the monoclinic space group P 2 1 / c (no. 14) with lattice parameters: a = 7.9193(5), b = 9.4907(6), c = 8.8090(6) Å, β = 95.180(2)°, Z = 4 for RbFe(SO 4 )(C 2 O 4 ) 0.5 · H 2 O; a = 8.0654(11), b = 9.6103(13), c = 9.2189(13) Å, β = 94.564(4)°, Z = 4 for CsMn(SO 4 )(C 2 O 4 ) 0.5 · H 2 O; and a = 7.9377(3), b = 9.5757(4), c = 9.1474(4) Å, β = 96.1040(10)°, Z = 4 for CsFe(SO 4 )(C 2 O 4 ) 0.5 · H 2 O. All compounds exhibit three-dimensional frameworks composed of [ M O 6 ] octahedra, [SO 4 ] 2– tetrahedra, and [C 2 O 4 ] 2– anions. The alkali cations are located in one-dimensional tunnels.
研究领域:
材料科学
·
晶体学
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Feng Zheng,Hanqin Gong,Zheng Li,Weiguang Yang,Jiahe Xu,Pengfei Hu,Yang Li,Yu Gong,Qiang Zhen
WO 3 microspheres film with a tertiary, textured and porous structure assembled of WO 3 hierarchical nanorods has been directly prepared on Cu foil using a one-step hydrothermal method . The field emission scanning electron microscopy (FESEM), energy dispersive X-ray (EDX) spectrum, X-Ray Diffraction (XRD), high resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS) are used to reveal the surface microtopography, crystal structure, elementary composition, valence state and formation mechanism of WO 3 tertiary structure. Moreover, the electrochemical properties and supercapacitive performances of WO 3 microspheres film are also intensively investigated. The WO 3 microspheres film has high specific capacitances of 485, 426, 372, 319 and 260 F g −1 at unit currents of 0.5, 1, 2, 5 and 10 A g −1 and exhibits good cycle stability (93% after 5000 cycles) and reversibility (98.5%), a lower charge transfer resistance (0.5 Ω) and high energy densities ranging from 21 to 17 W h kg −1 corresponded to high power densities varied from 150 to 3000 W kg −1 .
研究领域:
材料科学
·
电化学
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高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 45
·12240-12244
·
IF 5.976
Yanqiang Li,Sangen Zhao,Pai Shan,Xianfeng Li,Qingran Ding,Shuai Liu,Zhenyue Wu,Sasa Wang,Lina Li,Junhua Luo
Sulfates have long been ignored as nonlinear optical materials over the past decades. Here we report a new sulfate deep-ultraviolet nonlinear optical material Li8NaRb3(SO4)6·2H2O synthesized by the facile water solution method. It crystallizes in the asymmetric monoclinic space group C2 (No. 5). Its single-crystal structure features a three-dimensional framework made up of SO4 and LiO4 tetrahedra. Powder second-harmonic generation tests demonstrate that Li8NaRb3(SO4)6·2H2O is phase-matchable with a second-harmonic generation response of about 0.5 × KH2PO4. Ultraviolet-visible-near-infrared diffuse reflectance spectra illustrate that the ultraviolet cutoff edge of Li8NaRb3(SO4)6·2H2O may be as low as λ < 190 nm. Theoretical calculations reveal that the optical properties of Li8NaRb3(SO4)6·2H2O are mainly attributed to S–O groups. All these results reveal that Li8NaRb3(SO4)6·2H2O may possess potential use in the deep-ultraviolet nonlinear optics field. We believe that the discoveries in our work will attract scientists’ attention to sulfate systems for their potential as deep-ultraviolet nonlinear optical materials.
研究领域:
材料科学
·
光学
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高影响因子
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