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Dynamic heterogeneity in the glass-like monoclinic phases of CBrnCl4−n, n = 0,1,2
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View: Figures


Image of FIG. 1.
FIG. 1.

35Cl NQR spectra of CBrnCl4−n, n = 0, 1, 2 at 77 K.

Image of FIG. 2.
FIG. 2.

35Cl NQR spectra, at several temperatures, in the low-temperature monoclinic phase of CCl4.

Image of FIG. 3.
FIG. 3.

Temperature dependence of 35Cl NQR frequencies for the low-temperature monoclinic phase of CCl4. Inset: Temperature dependence of the central NQR frequency for the low-temperature monoclinic phase of CBrCl3 (empty blue squares) compared with line 1 for CCl4 (brown filled circles).

Image of FIG. 4.
FIG. 4.

Temperature dependence of the spin-lattice (filled symbols) and spin-spin (empty squares) relaxation times in CCl4. Solid and dashed lines fitted values with Eqs. (4) and (5).

Image of FIG. 5.
FIG. 5.

35Cl T 1 magnetization decay curves as a function of separation between pulses at T = 109 K for lines 11 (orange circle), 2, 6, 8, 16 (green, brown, black, and violet squares, respectively).

Image of FIG. 6.
FIG. 6.

35Cl (filled circles) and 37Cl (empty circles) spin lattice relaxation times of line 16 of CCl4.

Image of FIG. 7.
FIG. 7.

Temperature dependence of spin-lattice (empty triangle) and spin-spin (empty circle) relaxation times in CBrCl3 (blue), CBr2Cl2 (orange). For comparison T 1 (filled symbols) and T 2 (empty symbols) of some CCl4 NQR lines are presented (brown: line 1, red: line 14, and violet: line 6).

Image of FIG. 8.
FIG. 8.

Reorientational correlations times obtained from T 1 of CCl4 and the ratio between the different sets.

Image of FIG. 9.
FIG. 9.

Tetrahedral molecule: The four C3 axes and the jump probabilities w i around these axes are shown.

Image of FIG. 10.
FIG. 10.

Decay constants τ = λ−1 (λ being the eigenvalues of Λ) for different ratios w 2/w 1: (a) w 2/w 1 = 20, (b) w 2/w 1 = 1, (c) w 2/w 1 = 0.05.

Image of FIG. 11.
FIG. 11.

Spin polarization decay for different ratios w i /w 1 and initial conditions. Exponential decays with the four eigenvalues of Λ shown in Fig. 11 correspond to the black lines. Blue, red, cyan, and green refer to polarization of sites 1, 2, 3, and 4, respectively. (a) and (b) Full and dashed lines: saturating one and two sites at t = 0. (c) Full, dashed, and dotted lines: saturating one, two, or three nuclear sites at t = 0.

Image of FIG. 12.
FIG. 12.

Dielectric relaxation times: Empty squares (τα) and circles (τβ) for CBr2Cl2 (red) and CBrCl3 (black) from Ref. 9. NQR τc correlation times for CCl4: Filled squares from lines 2, 6, 8, 14, and 16; filled circles from lines 1, 7, 11, 12, 13, and 15. Empty blue and orange triangles NQR correlation times for CBrCl3 and CBr2Cl2.

Image of FIG. 13.
FIG. 13.

βKWW stretched exponent of the stretched relaxation function for CBrCl3 (empty black squares) and CBr2Cl2 (empty red squares). Blue filled triangles stretching parameter determined from the NQR correlation times.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Dynamic heterogeneity in the glass-like monoclinic phases of CBrnCl4−n, n = 0,1,2