Physical Chemistry Chemical Physics

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ISSN / EISSN : 1463-9076 / 1463-9084
Current Publisher: Royal Society of Chemistry (RSC) (10.1039)
Total articles ≅ 42,683
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Fang Wu, Min Dou, Huan Li, Yunfei Liu, Qingnian Yao, Jiabao Wang
Physical Chemistry Chemical Physics; doi:10.1039/d1cp00052g

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Juan Carlos San Vicente Veliz, Debasish Koner, Max Schwilk, Raymond J. Bemish, Markus Meuwly
Physical Chemistry Chemical Physics; doi:10.1039/d1cp01101d

Abstract:
Thermal rates for the C(3P) + O2(3Σ- g) ↔ CO(1Σ+)+ O(1D)/O(3P) reaction are investigated over a wide temperature range based on quasi classical trajectory (QCT) simulations on 3-dimensional, reactive potential energy...
Christos P.E. Varsamis, Nikos Makris, Christina Valvi, E. I. Kamitsos
Physical Chemistry Chemical Physics; doi:10.1039/d1cp00301a

Abstract:
Bismuth-containing borate glasses, xBi2O3-(1-x)B2O3, were synthesized in the broad composition range 0.20≤x≤0.80 by melting in Pt crucibles and splat-quenching between two metal blocks. Infrared reflectance spectra, measured in the range 30-5000 cm-1, were transformed into absorption coefficient spectra and then deconvoluted into component bands to probe the glass structure as a function of composition. Integrated intensities of bands above 800 cm-1 were used in combination with mass and charge balance equations to quantify the short-range borate structure in terms of the molar fractions X4m, X4o, X3, X2, X1 and X0 for borate units BØ4-, BØ2O23-, BØ3, BØ2O-, BØO22- and BO33-, where Ø and O- denote bridging and non-bridging oxygen atoms. Borate tetrahedral units were found to be present in both the metaborate, BØ4-, and orthoborate, BØ2O23-, forms with BØ4- constituting the dominating tetrahedral species for 0.20≤x≤0.70. The BØ2O23- units prevail at higher Bi2O3 levels (x>0.7), and coexist with their isomeric triangular borate species BO33- (BØ2O23-⇌ BO33-). The present IR results for the total molar fraction of borate tetrahedral units, X4=X4m+X4o, are in very good agreement with reported NMR results for the fraction of boron atoms in four-fold coordination, N4. Besides evaluating X4m and X4o, the present work reports also for the first time the fractions of all types of triangular borate species X3-n with n=0, 1, 2 and 3. The IR region below 550 cm-1 was found to be dominated by the Bi-O vibrational activity in coexisting ionic (160-230 cm-1) and distorted BiO6 sites (330-365 cm-1 and 475-510 cm-1), a result reflecting the dual role of Bi2O3 as glass-modifier and glass-former oxide. The latter role dominates in glasses exceeding 60 mol% Bi2O3, and is consistent with the extended glass formation in the bismuth-borate system. The structural results were used to calculate the average number of bridging B-Ø bonds per boron center, the average Bi-O and B-O single bond energy, and the atomic packing density of the studied glasses. These properties vary approximately linearly with Bi2O3 content in the three regimes 0.2≤x≤0.4, 0.4
Physical Chemistry Chemical Physics; doi:10.1039/d0cp90285c

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Alexey Savelyev
Physical Chemistry Chemical Physics; doi:10.1039/d1cp00688f

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, , Pamela Rosado, Sri Hari Bharath Vinoth Kumar, Rene Gunder, Axel Hoffmann, Bernd Szyszka,
Physical Chemistry Chemical Physics; doi:10.1039/d1cp00102g

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Xiaoqiu Guo, Ruixin Yu, Jingwen Jiang, Zhuang Ma, Xiuwen Zhang
Physical Chemistry Chemical Physics; doi:10.1039/d1cp00736j

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Jan ThOgersen, Tobias Weidner, Frank Jensen
Physical Chemistry Chemical Physics; doi:10.1039/d1cp00205h

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Abrar Faiyad, Adnan Mahathir Munshi, Mahbubul Islam, Sourav Saha
Physical Chemistry Chemical Physics; doi:10.1039/d0cp06614a

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