JOURNAL OF PHYSICAL CHEMISTRY B
·
2018
·
IF 3.146
Minglun Li,Yuyuan Lu,Lijia An
Using our recently proposed method to obtain salt and ion polarizabilities in aqueous solutions, we determine the polarizabilities of five salts (LiCl, NaCl, NaBr, KBr, and MgSO4) in water–acetonitrile, water–ethanol, and water–acetone solutions at eight different water–organic solvent compositions at the D-line of sodium (589.3 ± 0.1 nm). Setting Li+ as the reference ion, we determine the ion polarizabilities of Na+, Cl–, and Br– in binary liquid mixtures. Our results show that cation polarizability is nearly unaffected by solvent composition, but anion polarizability exhibits a nonmonotonic behavior with increasing mole fraction of the organic component in the liquid mixture. This suggests that ion polarizability in a solution is affected by the solvent. The results of salt and ion polarizabilities can be used as important reference data for physical chemistry, atmospheric science, and biophysics.
研究领域:
物理化学
·
大气科学
·
生物物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Li-Jia Yao,Chun-Li Hu,Zhi Fang,Jiang-Gao Mao
Birefringent materials are very important in the laser industry. By combining the hexathiodiphosphate(IV) [P 2 S 6 ] 4- unit and the highly polarizable Hg 2+ , a mercury hexathiodiphosphate(IV) Hg 2 P 2 S 6 was designed and synthesized by using solid-state synthesis. Hg 2 P 2 S 6 crystallizes in P 1 ¯ space group. It has a layered structure as in many hexathiodiphosphates(IV) such as ZnPS 3 , CdPS 3 . Its crystal structure, electronic structure and optical properties are investigated by experimental methods and first-principle calculations. Hg 2 P 2 S 6 has a very large birefringence of 0.50 at 1064 nm and 0.48 at 2050 nm. Theoretical studies show the large birefringence comes from the synergistic effect of [P 2 S 6 ] 4- and [HgS 4 ] 6- groups with strong polarizability anisotropy.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2020
·
IF 7.635
Xuan Guo,Hua Deng,Qiang Fu
Materials with low dielectric constant have drawn more and more attention due to their wide range of applications in electronic devices. Two type of methods are often used to reduce the dielectric constant of a given materials: introducing voids and replacing groups having higher polarizability with the ones having lower through copolymerization . Different from above methods, current study proposes a novel and efficient method by allow inorganic filler participating the curing process of polymer matrix , thus, consuming some of the functional groups with high polarizability. Nickel hydroxide (Ni(OH) 2 ) is selected as filler to be dispersed in room temperature vulcanized silicone rubber (SR). The addition of 1% Ni(OH) 2 into SR has resulted a decrease in dielectric constant from 3.1 to 2.1, and slightly reduced dielectric loss. With further increasing Ni(OH) 2 content, the dielectric constant increases gradually. From various characterizations, it is confirmed that Ni(OH) 2 is involved in the curing process of SR, thus, the hydroxyl group content in the final composites is reduced. Meanwhile, Ni(OH) 2 with different size and synthesized Ni(OH) 2 from hydrothermal process is also used to further confirm such observation. This method provides a novel route for the preparation of low dielectric constant materials.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
·
2017
·
IF 3.177
Minglun Li,Bilin Zhuang,Yuyuan Lu,Zhen-Gang Wang,Lijia An
We present a novel method for obtaining salt polarizabilities in aqueous solutions based on our recent theory for the refractive index of salt solutions, which predicts a linear relationship between the refractive index and the salt concentration at low concentrations, with a slope determined by the intrinsic values of the salt polarizability and the density of the solution. Here we apply this theory to determine the polarizabilities of 32 strong electrolyte salts in aqueous solutions from refractive index and density measurements. Setting Li+ as the standard ion, we then determine the polarizabilities of seven cations (Na+, K+, Rb+, Cs+, Ca2+, Ba2+, and Sr2+) and seven anions (F–, Cl–, Br–, I–, ClO4–, NO3–, and SO42–), which can be used as important reference data. We investigate the effect of temperature on salt polarizabilities, which decreases slightly with increasing temperature. The ion polarizability is found to be proportional to the cube of bare ionic radius (rbare3) for univalent ions, but the relationship does not hold for multivalent ions. Contrary to findings of Krishnamurti, we find no significant linear relationship between ion polarizability and the square of the atomic number (N2) for smaller ions.
研究领域:
物理化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·
IF 3.9
Yun Sun,Jiangtao Wu,Ying Tang,Huaicheng Xiang,Jie Li,Liang Fang
X-ray diffractometer with Rietveld refinement and Raman spectroscopy were used for phase analysis. Ca doping results in decreased ε r (24.09–21.52), Q × f (68 914–40 110 GHz), and τ f (−50.0 ppm/°C to −60.2 ppm/°C) all decrease, which obviously does not conform to the mutual constraint relationship among the three parameters of microwave dielectric properties. The ε r of Ce 1− x Ca x O 2− x ceramics is affected by the ion polarizability and the Ce rattling and valence states, among which the rattling of Ce cations plays a dominant role. The presence of oxygen vacancies in Ce 1− x Ca x O 2− x ceramics explains the decrease in Q × f . The τ ε , ε r , and α L are responsible for the decrease in τ f , especially for the τ αm -3 α L values.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
·
2015
·
IF 3.302
Ni An,Bilin Zhuang,Minglun Li,Yuyuan Lu,Zhen-Gang Wang
We propose a simple theoretical formula for describing the refractive indices in binary liquid mixtures containing salt ions. Our theory is based on the Clausius–Mossotti equation; it gives the refractive index of the mixture in terms of the refractive indices of the pure liquids and the polarizability of the ionic species, by properly accounting for the volume change upon mixing. The theoretical predictions are tested by extensive experimental measurements of the refractive indices for water–acetonitrile-salt systems for several liquid compositions, different salt species, and a range of salt concentrations. Excellent agreement is obtained in all cases, especially at low salt concentrations, with no fitting parameters. A simplified expression of the refractive index for low salt concentration is also given, which can be the theoretical basis for determination of salt concentration using refractive index measurements.
研究领域:
物理化学
·
分析化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 38
·9094-9102
·
IF 5.066
Ming Li,Hui Zhang,Yan Zhang,Baoshan Hou,Chuangyang Li,Xibin Wang,Ji Zhang,LingHan Xiao,Zhanchen Cui,Yuhui Ao
Novel benzothiadiazole-based second-order nonlinear optical (NLO) chromophores with different push–pull structures were developed. Incorporation of benzothiadiazole (BTD) as a bridge for improving the electro-optic (EO) coefficient (r33) of bulky materials has not been well investigated, despite its extensive application in other photonic materials as electron acceptor. NMR and MS have been used to characterize the structure of synthesized chromophores 5–7. Optical properties have been investigated by UV-vis spectra. Density functional theory calculations have been used to calculate the first-order hyperpolarizability (β) of chromophores r1, 5a, 7a and 5b. Moreover, the poling results of guest–host EO polymers, 5a/PC and 5b/PC, afforded good r33 values of 67 pm V−1 and 45 pm V−1, respectively. All the results demonstrated an improvement in both micro- and macroscopic nonlinearity after incorporation of BTD into chromophores.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2025
·
IF 4.7
Yuan-Bin Chen,Siyi Xiong
In this study, the NaAg 1-x Bi x/3 MoO 4 (x = 0.06, 0.12, 0.18, and 0.24) ceramics were successfully synthesized via solid-state reaction at 400–535 °C. Notably, the NaAg 0.82 Bi 0.06 MoO 4 ceramic exhibited exceptional dielectric properties at 450 °C (ε r = 7.39 ± 0.05, Q × f = 18,867 ± 1480 GHz, τ f = −84.8 ± 1.3 ppm/°C). The Rietveld refinement confirmed its spinel-like structure belonging to the Fd-3m (227) space group, along with the formation of a Na 0.5 Bi 0.5 MoO 4 secondary phase, as supported by SEM and EDS analyses. Further investigation revealed that the Na 0.5 Bi 0.5 MoO 4 phase adversely impacted the Q × f value, while the relative density positively correlated with Q × f. Based on the Shannon additivity rule, the contribution of Bi 3+ ions to ε r was elucidated. The P–V-L theory provided a theoretical foundation for understanding the dielectric behavior of NaAg 1-x Bi x/3 MoO 4 ceramics. Additionally, Raman spectroscopy directly confirmed the enhancement of molecular polarizability by Bi 3+ ions and disclosed a negative correlation between the A 1g vibration mode and Q × f, further elucidating the intimate link between internal lattice vibrations and microwave dielectric properties.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2020
·
IF 9.567
Minqiang Gai,Tinghao Tong,Ying Wang,Zhihua Yang,Shilie Pan
By the selective fluorination of IO4 in iodates, SrI2O5F2 (SIOF) and Ba(IO2F2)2 (BIOF) were synthesized successfully. They are the first reported cases of alkaline-earth metal fluoroiodates, and the (IO3F)2– units in SIOF were discovered for the first time to the best of our knowledge. BIOF possesses the shortest UV cutoff edge (230 nm), and SIOF has the largest birefringence (cal. 0.203 at 532 nm) among the reported fluoroiodates. The highly polarizable (IO3F)2–, with high polarizability anisotropy, induces a large birefringence in SIOF by theoretical calculation. This work will contribute to enlarge the structural diversity and provide a good choice for the material design in fluoroiodates.
研究领域:
无机化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2018
·
IF 2.873
H.L. Pan,Y.X. Mao,Y.K. Yang,Y.W. Zhang,H.T. Wu
Li 2 Mg 3 Ti 1-X (Mg 1/3 Ta 2/3 ) X O 6 (x = 0.00, 0.05, 0.10, 0.15, 0.20) solid solution ceramics were prepared by the conventional solid-state reaction method. Rietveld refinements, Raman spectra, infrared spectra, polarizability and bond energy were used to research the changes of microwave dielectric properties of these solid solutions. With the increase of x values from 0 to 0.2, dielectric constants ( ε r ) gradually increased, which could be explained by the variations of the polarizability, infrared resonant modes and Raman vibration modes. The variations of the quality factor ( Q·f ) could be explained by the changes of the bond valences. The temperature coefficient of resonant frequency ( τ ƒ ) correlated with the bond energy of Ti O bonds. A small quantity of (Mg 1/3 Ta 2/3 ) 4+ can obviously improve the microwave dielectric properties. Excellent microwave dielectric properties of ε r = 14.70, Q·f = 200,600 GHz and τ f = −11.83 ppm/°C were obtained for Li 2 Mg 3 Ti 0.95 (Mg 1/3 Ta 2/3 ) 0.05 O 6 ceramic sintered at 1550 °C.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 36
·8490-8495
·
IF 5.066
Liang Bai,Shi Qiao,Yu Fang,Jianguo Tian,J. Mcleod,Yinglin Song,Hui Huang,Yang Liu,Zhenhui Kang
We quantitatively investigate the nonlinear optical (NLO) property of carbon nanodots (CNDs, less than 10 nm) by the Z-scan technique using a tunable 532 nm nanosecond laser system. These CNDs were fabricated by an electrochemical etching method from graphite rods. Our results suggested that the third-order nonlinear susceptibility χ(3) of CNDs is strongly dependent on the diameter of the CNDs apparently; the nonlinear refractive index γ decreased as the size of CNDs decreased, while the nonlinear absorption coefficient β showed an opposite tendency to γ. We further demonstrated that the carboxyl group on the CND surface plays a key role and has significant impact on the third-order nonlinear susceptibility χ(3).
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 29
·期 5
·3640-3647
·
IF 2.019
Guo Jingdong,Ma Weibing,Ma Minjie,Zhao Huaidang,Yang Yixuan,Gao Jifeng
Microwave dielectric properties and microstructures of ultra-low loss Li 2 Mg 3 TiO 6 ceramic prepared by reaction-sintering method (RS) and conventional solid-state reaction method (CS) have been investigated. The XRD patterns and SEM images revealed that the single phase of Li 2 Mg 3 TiO 6 and uniform morphology are obtained by both RS and CS methods at the optimal sintering temperatures. In order to further investigate the effects of different sintering methods on the microwave dielectric properties of Li 2 Mg 3 TiO 6 ceramics, the oxide polarizabilities and packing fraction were calculated based on the Rietveld refinement. The calculation results revealed that the RS method was more beneficial to the microwave dielectric properties of Li 2 Mg 3 TiO 6 ceramics in comparison with CS method. Excellent microwave dielectric properties for Li 2 Mg 3 TiO 6 ceramics with enhanced Q × f value of 157,036 GHz could be obtained using RS method sintered at 1250 °C for 6 h.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
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