| 词汇 | tetragonal |
| 释义 | tetragonal adjective chemistry specializeduk /təˈtræɡ.ə.nəl/ us /təˈtræɡ.ə.nəl/ of or relating to the shape of a crystal in which two of three axes of each crystal are of the same length and all three axes form right angles: 四方形的 Some of the larger crystals are elongate, which gives them a tetragonal rather than cubic appearance.一些较大的晶体是拉长的，这使得它们呈四方形而不是立方形。 When heated from room temperature, the crystals change to show tetragonal symmetry. Two crystal forms were obtained; one had tetragonal symmetry, and the second had hexagonal symmetry. The symmetry of the tetragonal system requires the crystal to have three axes, with two of them equal in length and the third axis either longer or shorter than the other two. Geometrical shapes -cornered circularly congruently conic cylindrically lozenge orbicular ovally ovoid parallelogram pentagon polyhedron polytope prism pyramid quadrilateral rectangle rectangular rhombus three-dimensional Examples of tetragonaltetragonal The more common, tetragonal beta phase was first identified as the mineral plattnerite around 1845 and later produced synthetically. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The alpha allotrope is rhombohedral, and the beta allotrope is tetragonal. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. When the phosphate anion is replaced by the larger vanadate anion, the tetragonal crystal system preferentially accommodates the larger light rare earth elements. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The crystal structure of zircon is tetragonal crystal system. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It usually forms tetragonal-shaped crystals and it has a hardness of 3 mohs. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Other columnar phases with long-range order are classified by their two-dimensional lattices: hexagonal, tetragonal, rectangular, and oblique phases. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In some cases, the tetragonal phase can be metastable. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It belongs to the spinel group and forms tetragonal crystals. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The "tetragonal trisoctahedron" is another name for the deltoidal icositetrahedron, a different polyhedron with three quadrilateral faces for every face of an octahedron. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Crookesite is an opaque, bluish grey to pink toned brown metallic mineral crystallizing in the tetragonal system. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It is a brown to black metallic mineral which crystallizes in the tetragonal system. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Numerous examples are known with cubic, tetragonal, rhombohedral, and orthorhombic symmetries. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Vesuvianite occurs as tetragonal crystals in skarn deposits and limestones that have been subjected to contact metamorphism. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The others are akaogiite (monoclinic), anatase (tetragonal) and rutile (tetragonal). From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Those minerals have same chemical composition but different crystal symmetry: orthorhombic for columbite and tetragonal for tapiolite. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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