monoclinic system

monoclinic system

[¦män·ə′klin·ik ‚sis·təm]
(crystallography)
One of the six crystal systems characterized by a single, two-fold symmetry axis or a single symmetry plane.
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The crystal complex crystallizes in the monoclinic system with space group P2 (1)/c.
The analyzed results were packing of a monoclinic system (a = 4.85 [Angstrom], b = 6.47 [Angstrom], c = 16.03 [Angstrom], [alpha] = [gamma] = 90[degrees], [beta] = 117.9[degrees]).
The crystal structure of the complex belongs to monoclinic system and space group P2(l)/n, with cell parameters of a = 9.8468(7) [Angstrom], b = 5.2013(4) [Angstrom], c = 14.6041(15) [Angstrom], [beta] = 111.745(6)[degrees], Z = 2, and Dc = 1.666 g [cm.sup.-3].
XRD analysis indicates that the crystal belongs to a monoclinic system with unit cell parameters a = 1.1028 nm, b = 0.6556 nm, c = 0.9114 nm, and [beta] = 91.431[degrees].
By refinement of experimental X-ray data of as deposited W[O.sub.3] using the software DICVOL04, the data finds that they are in good agreement with the monoclinic system reported in the ICDD PDF (20-1324) (W[O.sub.3])[15].
For monoclinic phases two coordinate lattice systems can be used: with the 2-fold rotation axis, which is common to all point groups in the monoclinic system, defined parallel to c or b lattice vectors, resulting in first and second setting respectively.
It crystallizes in the monoclinic system and is isostructural with herderite.
In the monoclinic system, the cell is based on the shortest possible vectors in the ac plane with b the unique axis.
Optical data: Biaxial (-), [alpha] 1.99, [beta] 2.03, [gamma] 2.06, 2V(meas.) large, 2V (calc.) 80[degrees]; dispersion r < v, significant; nonpleochroic; orientation is given as X (or Y) ^ a = -11[degrees], Z = c, but this is not possible in the monoclinic system. Chemical analytical data: Means of four sets of electron microprobe data ([H.sub.2]O calculated from the ideal formula): CuO 2.46, ZnO 0.08, PbO 65.95, A[l.sub.2][O.sub.3] 5.75, F[e.sub.2][O.sub.3] 0.05, [P.sub.2][O.sub.5] 11.67, [V.sub.2][O.sub.5] 9.84, A[s.sub.2][O.sub.5] 0.06, S[O.sub.3] 0.10, Cr[O.sub.3] 1.99, [H.sub.2]O (1.35), Total (99.30) wt.%.
Carbon tetrachloride III crystallizes in the monoclinic system ([P2.sub.1]/c, Z= 4) with unit cell dimensions a = (9.079[+ or -]0.012)A, b = (5.764[+ or -]0.003)A, c = (9.201[+ or -]0.004)A, and [beta] - 104.29[degrees][+ or -]0.05[degrees].