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Qu'est-ce (qui) est Tetragonal - définition
CHEMICAL COMPOUND
Tetragonal zirconia polycrystaline; TZP; Tetragonal Zirconia Polycrystal
Tetragonal
·adj Having four prominent longitudinal angles.
II. Tetragonal ·adj Designating, or belonging to, a certain system of crystallization; dimetric. ·see Tetragonal system, under Crystallization.
III. Tetragonal ·adj Of or pertaining to a tetragon; having four angles or sides; thus, the square, the parallelogram, the rhombus, and the trapezium are tetragonal fingers.
tetragonal
[t?'trag(?)n(?)l]
¦ adjective denoting a crystal system with three axes at right angles, two of them equal.
Derivatives
tetragonally adverb
Origin
C16: via late L. from Gk tetragonon (neut. of tetragonos 'four-angled') + -al.
Tetragonal polycrystalline zirconia
Yttria blends of approximately 3% are called either tetragonal polycrystalline zirconia or tetragonal zirconia polycrystal (forming the initialisms TZP or TPZ) and have the finest grain size. These grades exhibit the highest toughness at room temperature, because they are nearly 100% tetragonal, but this degrades severely between 200 and 500 °C as these irreversible crystal transformations also cause dimensional change.
Wikipédia
Tetragonal polycrystalline zirconia
Yttria blends of approximately 3% are called either tetragonal polycrystalline zirconia or tetragonal zirconia polycrystal (forming the initialisms TZP or TPZ) and have the finest grain size. These grades exhibit the highest toughness at room temperature, because they are nearly 100% tetragonal, but this degrades severely between 200 and 500 °C as these irreversible crystal transformations also cause dimensional change.
