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• W2093658319 abstract "An investigation of the permittivity and ac conductivity was performed for the first time on the isostructural tetrasubstituted alkylammonium (CH 3 ) 4 NBF 4 and (CH 3 ) 4 NClO 4 single crystals, in the wide temperature range 12–300 K. For both the explored compounds, an orientational order/disorder phase transition was brought out as a result of the overlapping of two distinct transitions occurring with different dynamics. The first one is the settlement of a stable array, at low temperature, of the anionic groups (orientationally disordered at RT) with a first order character; the second one is the correspondent cationic sublattice rearrangement with the characteristics of second order. The critical temperatures and limits of the transitions were defined. Different conductivity processes above and below the transition were detected and analyzed. At lower temperatures the intra- and inter-molecular motions of the cationic group were brought out through their contribution to the dielectric constant. The temperature values of the freezing out of the vibrational motions were experimentally established for both the observed ionic crystals. Furthermore, the IR spectroscopy has provided spectra of the vibrational modes in the different phases below and above the phase transition, in excellent agreement with the dielectric data. In a general perspective, the obtained results clearly suggest that the thermal evolution displayed by the two investigated compounds is characteristic of the isostructural tetramethylammonium salts; the expected variations for different anionic groups are discussed. • Complex dielectric properties behavior of the quoted salts was firstly investigated. • Coexistence of two different phase transitions related to the two sublattices. • Three temperature regions with different conduction processes were brought out. • Below the transition the freezing of molecular vibrational modes was pinpointed. • IR modes spectra are provided in different phases correlated with dielectric results." @default.
• W2093658319 created "2016-06-24" @default.
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• W2093658319 date "2014-09-01" @default.
• W2093658319 modified "2023-09-24" @default.
• W2093658319 title "Thermal evolution of tetramethylammonium tetrafluoborate and perchlorate investigated through dielectric and IR spectroscopy" @default.
• W2093658319 cites W1965593357 @default.
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• W2093658319 doi "https://doi.org/10.1016/j.matchemphys.2014.04.018" @default.
• W2093658319 hasPublicationYear "2014" @default.
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