MTL 200 EXAM PRACTICE
QUESTIONS AND 100% CORRECT
ANSWERS!!
How many anions and cations do you have in a Rock Salt Structure?
4 anions and 4 cations.
What is the main relationship between the unit cell and cesium chloride structure
(CsCl)and its coordination number?
2(r_c + r_a) = √3 × a
Its coordination number is 8
What is the main relationship between the unit cell and zinc blende structure (ZnS) and
its coordination number?
The main relationship is 4(r_c + r_a) = √3 a.
Its coordination number is 4.
What is the equation for the volume of a sphere?
V=4/3 πr3
What are the examples of ceramics with rock salt structure (NaCl)?
Examples include NaCl, MgO, MnS, LiF, and FeO.
What is the coordination number and structure of the CsCl structure?
Coordination number = 8, anions @ corners of a cube, single cation @ center.
What is the coordination number and structure of the zinc blende structure (ZnS)?
coordination number = 4, and each Zn is bonded to 4 S atoms. The structure is FCC.
What is the coordination number of AmXp-type ceramic?
, AX2 subdivision: coordination number is 8 and an example is CaF2, rc/ra = 0.8. (Ca - center, F -
corners)
What is AmBnXp - Type?
Cubic Structure (consists of 2 cations) ex. BaTiO3
What may ceramic crystal structures be considered in terms of?
closedpacked planes of ions, as well as unit cells
Coordination # of Tetrahedral and Octahedral Position
1. Tetrahedral Position - 4 2. Octahedral Position - 6
What do Ceramic Crystal structures depend on?
1. stacking of anion close packed layers (FCC, HCP)
2. Cations reside in octahedral positions
3. Manner which interstitial sites are filled with cations
What are interstitial sites?
they are small spaces between closely packed atoms or ions. In ceramics sites are filled
with cations, effecting properties.
What are silicate ceramics?
Silicates are composed of silicon and oxygen. Which are very common so examples are; bulk of
soil, rocks. clays, sand
What type of bond do silicate ceramics have?
Strong Covalent Bond!
What are the 3 sub divisions of silicate ceramics?
1. silica 2. silica glass
3. the silicates
Silica Key words
QUESTIONS AND 100% CORRECT
ANSWERS!!
How many anions and cations do you have in a Rock Salt Structure?
4 anions and 4 cations.
What is the main relationship between the unit cell and cesium chloride structure
(CsCl)and its coordination number?
2(r_c + r_a) = √3 × a
Its coordination number is 8
What is the main relationship between the unit cell and zinc blende structure (ZnS) and
its coordination number?
The main relationship is 4(r_c + r_a) = √3 a.
Its coordination number is 4.
What is the equation for the volume of a sphere?
V=4/3 πr3
What are the examples of ceramics with rock salt structure (NaCl)?
Examples include NaCl, MgO, MnS, LiF, and FeO.
What is the coordination number and structure of the CsCl structure?
Coordination number = 8, anions @ corners of a cube, single cation @ center.
What is the coordination number and structure of the zinc blende structure (ZnS)?
coordination number = 4, and each Zn is bonded to 4 S atoms. The structure is FCC.
What is the coordination number of AmXp-type ceramic?
, AX2 subdivision: coordination number is 8 and an example is CaF2, rc/ra = 0.8. (Ca - center, F -
corners)
What is AmBnXp - Type?
Cubic Structure (consists of 2 cations) ex. BaTiO3
What may ceramic crystal structures be considered in terms of?
closedpacked planes of ions, as well as unit cells
Coordination # of Tetrahedral and Octahedral Position
1. Tetrahedral Position - 4 2. Octahedral Position - 6
What do Ceramic Crystal structures depend on?
1. stacking of anion close packed layers (FCC, HCP)
2. Cations reside in octahedral positions
3. Manner which interstitial sites are filled with cations
What are interstitial sites?
they are small spaces between closely packed atoms or ions. In ceramics sites are filled
with cations, effecting properties.
What are silicate ceramics?
Silicates are composed of silicon and oxygen. Which are very common so examples are; bulk of
soil, rocks. clays, sand
What type of bond do silicate ceramics have?
Strong Covalent Bond!
What are the 3 sub divisions of silicate ceramics?
1. silica 2. silica glass
3. the silicates
Silica Key words
