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Issue 3, 2017
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Formation of a solid solution between [N(C2H5)4][BF4] and [N(C2H5)4][PF6] in crystal and plastic crystal phases

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Abstract

The phase behavior of [N2222][BF4] and [N2222][PF6] (N2222+ = tetraethylammonium cation) binary systems has been investigated in the present study. Differential scanning calorimetry revealed that the crystal-to-plastic-crystal transition temperature decreases upon mixing the two salts, with a minimum at x([N2222][PF6]) = 0.4, where x([N2222][PF6]) denotes the molar fraction of [N2222][PF6]. Powder X-ray diffraction analysis indicated the formation of a solid solution with a rock-salt type structure in the plastic crystal phase at all ratios and the lattice parameter a changes according to Vegard's law. In the crystal phase, two solid solution phases based on the structures of the single salts are observed. Raman spectroscopy confirmed the changes in the solid–solid transition temperature as observed by differential scanning calorimetry. Consequently, in the resulting phase diagram, the solid solution is formed in a wide x([N2222][PF6]) range for both the crystal and plastic crystal phases.

Graphical abstract: Formation of a solid solution between [N(C2H5)4][BF4] and [N(C2H5)4][PF6] in crystal and plastic crystal phases

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Publication details

The article was received on 22 Nov 2016, accepted on 05 Dec 2016 and first published on 08 Dec 2016


Article type: Paper
DOI: 10.1039/C6CP07992J
Citation: Phys. Chem. Chem. Phys., 2017,19, 2053-2059
  • Open access: Creative Commons BY-NC license
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    Formation of a solid solution between [N(C2H5)4][BF4] and [N(C2H5)4][PF6] in crystal and plastic crystal phases

    K. Matsumoto, R. Nonaka, Y. Wang, G. Veryasov and R. Hagiwara, Phys. Chem. Chem. Phys., 2017, 19, 2053
    DOI: 10.1039/C6CP07992J

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