Coordination number in ceramic crystals increases with the ratio of ________ Cer
ID: 519892 • Letter: C
Question
Coordination number in ceramic crystals increases with the ratio of ________ Ceramic materials can be used for high temperature applications, because of the (high or low) bonding energy. This bonding energy also make ceramic have (high or low) mechanical strength and elastic modulus. Frenkel defect is a pair of a cation vacancy and an anion vacancy (True or False) The chemical formula of structure unit in silicates is _______. Ceramics usually break in a _______ manner (brittle or ductile). Usually, ceramics have excellent creep resistance in a wide temperature range (True or False) The annealing treatment on glass could remove________. The tempering treatment on glass could impose a_______ surface. During particulate forming of silicate ceramics, to achieve uniform shrinkage of green component, the drying rate should be ________ (fast or slow) ______ is the hardening mechanisms in cementation. In the sintering process, the ceramic powder must be melted. (True or False) Please draw the Specific volume VS. Temperature plots for amorphous ceramics and crystalline ceramics, respectively.Explanation / Answer
Coordination number:
The number of atoms or ions surrounding a particular atom or ion.
As the ratio of cation to anion increases, the coordination number increases.
1) Coordination number in ceramic crystals increases with the ratio of cation to the anion.
2) Ceramics can be used for high-temperature applications because of high bonding energy. This bonding energy also makes ceramic have low mechanical strength and elastic modulus.
3) False.
Frenkel defect is a point defect caused when a cation leaves its original position and moves to an interstitial position creating a vacancy.
4) the chemical formula for structure unit in silicates is SiO44-
5)Ceramics break in a brittle manner.
Ceramics have excellent creep resistance. TRUE
6) The annealing treatment of glass removes the strain introduced during formation.
7)The tempering treatment on a glass could impose a distorted surface.
8)During particulate forming of silicate ceramics to achieve uniform shrinkage of the green component, the drying rate should be slow to avoid cracks due to non-uniform shrinkage.
9)Carbonation is the hardening mechanism in cementation.
10) In the sintering process, the ceramic powder must be melted. FALSE