31. The technique is most commonly performed as powder diffraction, which only requires a polycrystalline powder. 32. Starship hulls are constructed using a " polycrystalline alloy " more durable than most conventional materials. 33. As a result, turbine blades are typically monocrystalline or polycrystalline with a preferred crystal orientation. 34. Single crystal nanorods and polycrystalline nanotubes of lead selenide have been synthesized via controlled organism membranes. 35. In 1986 Kienzle developed the first solar watch with light conditions and a polycrystalline solar element. 36. Polycrystalline cells can be recognized by a visible grain, a " metal flake effect ".37. Grain size has been shown to have an effect on the efficiency of polycrystalline solar cells. 38. Most inorganic solids are polycrystalline , including all common metals, many ceramics, rocks and ice. 39. Sulfur, while usually polycrystalline , may also occur in other allotropic forms with completely different properties. 40. Surface features and polycrystalline surfaces add complexity or change RHEED patterns from those from perfectly flat surfaces.
