“trigonal system”的意思、由来-百科全书

trigonal system

crystallography

also called Rhombohedral System,

one of the structural categories to which crystalline solids can be assigned. The trigonal system is sometimes considered to be a subdivision of the hexagonal system.

Components of crystals in the trigonal system, like those of the hexagonal system, are located by reference to four axes—three of equal length with 120° intersections and one perpendicular to the plane of the other three. The trigonal unit cell is distinguished by the presence of a single line called an axis of three-fold symmetry about which the cell can be rotated by 120° to produce a face indistinguishable from the face presented in the starting position. Selenium and other elements may crystallize in trigonal form.

词条	trigonal system
释义	trigonal system crystallography also called Rhombohedral System, one of the structural categories to which crystalline solids can be assigned. The trigonal system is sometimes considered to be a subdivision of the hexagonal system. Components of crystals in the trigonal system, like those of the hexagonal system, are located by reference to four axes—three of equal length with 120° intersections and one perpendicular to the plane of the other three. The trigonal unit cell is distinguished by the presence of a single line called an axis of three-fold symmetry about which the cell can be rotated by 120° to produce a face indistinguishable from the face presented in the starting position. Selenium and other elements may crystallize in trigonal form.
随便看	Sir George Hubert Wilkins Sir George James Frampton Sir George Jessel Sir George Mackenzie Sir George Otto, 2nd Baronet Trevelyan Sir George Otto Trevelyan, 2nd Baronet Sir George Paget Thomson Sir George Porter, Baron Porter of Luddenham Sir George Prevost, 1st Baronet Sir George Robey Sir George Stapledon Sir George Thomas Beilby Sir George-Étienne, Baronet Cartier Sir George-Étienne Cartier, Baronet Sir Georg Solti Sir Geraint Evans Sir Gerald du Maurier Sir Gilbert, 1st Baronet Blane Sir Gilbert, Baronet Parker Sir Gilbert Blane, 1st Baronet Sir Gilbert Hay Sir Gilbert Parker, Baronet Sir Gilbert Roberts Sir Giles Gilbert Scott Sir Godfrey, Baronet Kneller