twin plane

twin plane

[′twin ‚plān]
(crystallography)
The plane common to and across which the individual crystals or components of a crystal twin are symmetrically arranged or reflected. Also known as twinning plane.
References in periodicals archive ?
1988 At least 164 people are killed in twin plane crashes in India.
Twin martensites are conventionally classified into three categories: type I (i.e., the twin plane is a rational crystal plane), type II (i.e., the twin shear is a rational crystallographic direction), and compound twin (both the twin plane and twin shear are rational), the detailed definitions of which are described in the review [15].
The term "polysynthetic" corresponds to the case when three or more individuals are repeated alternatively on the same twin plane. The lamellas are joined on successive twin planes, parallel with elongation (Figure 2).
Murai et al (1976) [7] conducted experiments on twin plane incompressible jets issuing at an angle from the nozzle exit plane.
(1961) and Mason and Berry (1968) all cite heart-shaped contact twins with twin and composition plane (201 } as "common." However, each of these authors chose a different unit cell orientation, yet cited the same twin plane as the most common!
It is estimated that a twin plane, stay-cable system would have required 23 percent more cable grout and 52 percent more weight of cable sheathing than the single plane system.
Murai et al (1976) [6] conducted experiments on twin plane incompressible jets issuing at an angle from the nozzle exit plane.
These twins are not as obvious as the flattened twins from Peru, Dalnegorsk and Bulgaria; Mogul mine galena twins are blocky, with only a hint of a re-entrant angle on the twin plane. A few rare examples, such as the one in Figure 6, do show a parallel growth accompanied by some flattening.
These parallel lines are attributed to polysynthetic twin planes corresponding to the rhombohedral {1011} faces of corundum.
Coppelius, here an inventor of photographic images, walks home alternately across the stage and on film, setting up Marin's twin planes of reality for this urban fairy tale with hardly a trace of cynicism.
The other two symmetry planes are identical to the Baveno twin planes {021}.