rhombohedral


Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.

rhom·bo·he·dral

 (rŏm′bō-hē′drəl)
adj.
1. Of or relating to a rhombohedron.
2. Mineralogy Of or relating to a crystal having three axes of equal length intersecting at oblique angles.

rhombohedral

(ˌrɒmbəʊˈhiːdrəl)
adj
1. (Mathematics) of or relating to a rhombohedron
2. (Chemistry) crystallog another term for trigonal2

rhom·bo·he·dral

(rŏm′bō-hē′drəl)
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.rhombohedral - having threefold symmetry
crystallography - the branch of science that studies the formation and structure of crystals
symmetric, symmetrical - having similarity in size, shape, and relative position of corresponding parts
References in periodicals archive ?
It appears that negatively charged block of the copolymer binds only to the edges and vertices of the rhombohedral calcite crystal and other water soluble block sterically inhibits the introduction of the ions into the vertices and edges of the crystal structure at higher pHs.
Calcite occurs as micrite, sparite and signifies rhombohedral cleavage occasionally.
[18] prepared La doped BFO by sol-foam-gel method and observed that La doping results change in crystallographic structure of BFO from rhombohedral to Tetragonal.
In Figure 3 is shown the X-ray diffraction patterns for all of the hydrotalcite samples, where it is possible to observe the R-3m rhombohedral phase as a single phase in the precipitate samples, despite of the iron insertion, according the card number 89-5434 of the JCPDS data bank for powder diffraction patterns.
The structure of SiCr[Te.sub.3] is rhombohedral with space group 148 (R[bar.3]) and is shown in Figure 3.
To study the kinetics of hydrogen adsorption and desorption in such structures, three sets of the nc-SiC films containing mixtures of cubic and rhombohedral phases (3C + 21 R polytypic) were deposited on the single-crystalline Cu substrates.
The observed diffraction peaks were indexed on the basis of the standard rhombohedral structure of delafossite CuAl[O.sub.2] with R3m space group (JCPDS Card number 35-1401).
Impurity fringes are commonly observed along chalk fragments in the hydraulic breccia and also contain rhombohedral dolomite crystal ghosts (Figures 3(b) and 3(c)).
A morphotropic region exists on the T-x phase diagram around x [approximately equal to] 0.35 wherein several phases can come about: the cubic, pseudo-cubic, tetragonal, and rhombohedral [9].
This correlated with the report of [16], where in rhombohedral (trigonal) structure was exhibited by the calcium carbonate obtained from the sample.
In addition, its binding energy on (104) was much less than the attachment energy of (104), which was also in accordance with the experimental observation of PEI not affecting the general rhombohedral morphology of calcite [11].