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Phase-dependent dielectric properties and proton conduction of neopentyl glycol
Pan, Hailong1,2; Luo, Jiangshui1,2; Li, Bing3; Wubbenhorst, Michael2
Corresponding AuthorLuo, Jiangshui(Jiangshui.Luo@scu.edu.cn)
2021-07-14
Source PublicationRSC ADVANCES
Volume11Issue:38Pages:23228-23234
AbstractPhase-dependent dielectric properties and proton conduction of neopentyl glycol (NPG), which is an organic molecular plastic crystal, were studied via variable-temperature broadband dielectric spectroscopy (BDS). Permittivity and conductivity data show the phase transformations of NPG from the crystalline state to the plastic crystalline state at 315 K and then to the molten state at 402 K across the temperature range of 293-413 K. The Vogel temperatures (T-v) fitted from the Vogel-Fulcher-Tammann (VFT) equation agree well with the values extrapolated by the Stickel plot (linearized Vogel plot). Impedance and modulus data display a separation of the -Z '' (the imaginary part of the complex impedance) and M '' (the imaginary part of the complex electric modulus) peaks in the crystalline phase. However, they overlap in both the plastic crystalline phase and the molten phase, indicating long-range proton conduction. In both the molten phase and the plastic crystalline phase, the temperature dependence of direct current conductivity (sigma(dc)) obeys the VFT equation very well. While the vehicle mechanism (translational diffusion) is an intrinsic mechanism for ionic or protonic conduction in the molten phase, it is speculated that the Grotthuss mechanism also works due to the self-dissociation of NPG molecules, which are similar to water molecules. In the plastic crystalline phase, the proton hopping mechanism is most likely the underlying ion-conducting mechanism because of the rotational disorder and intrinsic defects (vacancies) of the NPG molecules. In the ordered crystalline phase, the proton conduction is presumed to follow the proton hopping mechanism as determined from the localized relaxation and the temperature dependence of sigma(dc) (Arrhenius behavior).
Funding OrganizationNational Natural Science Foundation of China ; Sichuan University ; China Scholarship Council (CSC) ; Research Foundation - Flanders (FWO) ; Natural Science Foundation of Fujian Province, China
DOI10.1039/d1ra03366b
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[21776120] ; Sichuan University[YJ202089] ; China Scholarship Council (CSC)[201808370196] ; Research Foundation - Flanders (FWO)[G0B3218N] ; Natural Science Foundation of Fujian Province, China[2018J01433]
WOS Research AreaChemistry
WOS SubjectChemistry, Multidisciplinary
WOS IDWOS:000671447100005
PublisherROYAL SOC CHEMISTRY
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/160202
Collection中国科学院金属研究所
Corresponding AuthorLuo, Jiangshui
Affiliation1.Sichuan Univ, Coll Mat Sci & Engn, Chengdu 610065, Peoples R China
2.Katholieke Univ Leuven, Dept Phys & Astron, Lab Soft Matter & Biophys, B-3001 Leuven, Belgium
3.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China
Recommended Citation
GB/T 7714
Pan, Hailong,Luo, Jiangshui,Li, Bing,et al. Phase-dependent dielectric properties and proton conduction of neopentyl glycol[J]. RSC ADVANCES,2021,11(38):23228-23234.
APA Pan, Hailong,Luo, Jiangshui,Li, Bing,&Wubbenhorst, Michael.(2021).Phase-dependent dielectric properties and proton conduction of neopentyl glycol.RSC ADVANCES,11(38),23228-23234.
MLA Pan, Hailong,et al."Phase-dependent dielectric properties and proton conduction of neopentyl glycol".RSC ADVANCES 11.38(2021):23228-23234.
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