MTL200 Final Exam Questions with Complete
Solutions
What are ceramics?
Ceramics are elements composed of at least two elements, often more, with complex crystal
structures that range from purely ionic to totally covalent.
Anisotropy
directionality of properties
What influences the crystal structure of ceramics?
The electrical charge of ions and the relative sizes of the anion and cation.
Why must a ceramic molecule be neutral?
The net charge across the cation and anion must be 0, and the whole ceramic molecule must be
neutral.
What do cations and anions prefer in terms of nearest neighbors?
Cations prefer to have as many nearest neighbor anions as possible, and anions prefer to have
as many cations as possible.
What are the most common coordination numbers in ceramics?
The most common coordination numbers in ceramics are 4, 6, and 8
What happens when the ratio of the radii is greater than 1?
The coordination number is 12.
What are the 3 types of ceramic crystal structures?
AX, AmXp, and AmBnXp Type
What are the 3 subdivisions of AX- Type ceramic structure?
, 1. Rock salt structure (NaCl)
2. Cesium Chloride Structure (CsCl)
3. Zinc Blende Structutre (ZnS)
What is the main relationship between the unit cell and rock salt structure (NaCl) and its
coordination number?
The main relationship is 2(r_c + r_a) = a.
Its coordination number is 6.
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?
The main relationship is 2(r_c + r_a) = sqrt(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) = sqrt(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?
Solutions
What are ceramics?
Ceramics are elements composed of at least two elements, often more, with complex crystal
structures that range from purely ionic to totally covalent.
Anisotropy
directionality of properties
What influences the crystal structure of ceramics?
The electrical charge of ions and the relative sizes of the anion and cation.
Why must a ceramic molecule be neutral?
The net charge across the cation and anion must be 0, and the whole ceramic molecule must be
neutral.
What do cations and anions prefer in terms of nearest neighbors?
Cations prefer to have as many nearest neighbor anions as possible, and anions prefer to have
as many cations as possible.
What are the most common coordination numbers in ceramics?
The most common coordination numbers in ceramics are 4, 6, and 8
What happens when the ratio of the radii is greater than 1?
The coordination number is 12.
What are the 3 types of ceramic crystal structures?
AX, AmXp, and AmBnXp Type
What are the 3 subdivisions of AX- Type ceramic structure?
, 1. Rock salt structure (NaCl)
2. Cesium Chloride Structure (CsCl)
3. Zinc Blende Structutre (ZnS)
What is the main relationship between the unit cell and rock salt structure (NaCl) and its
coordination number?
The main relationship is 2(r_c + r_a) = a.
Its coordination number is 6.
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?
The main relationship is 2(r_c + r_a) = sqrt(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) = sqrt(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?
