MTL200 EXAM SCRIPT TEST BANK EXAM
Q&A 2026 VIEW AHEAD EXAM.
⩥ Anisotropy Answer: directionality of properties
⩥ What influences the crystal structure of ceramics? Answer: The
electrical charge of ions and the relative sizes of the anion and cation.
⩥ Why must a ceramic molecule be neutral? Answer: 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?
Answer: 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?
Answer: The most common coordination numbers in ceramics are 4,
6, and 8
⩥ What happens when the ratio of the radii is greater than 1? Answer:
The coordination number is 12.
,⩥ What are the 3 types of ceramic crystal structures? Answer: AX,
AmXp, and AmBnXp Type
⩥ What are the 3 subdivisions of AX- Type ceramic structure?
Answer: 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? Answer: 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? Answer: 4 anions and 4 cations.
⩥ What is the main relationship between the unit cell and cesium
chloride structure (CsCl)and its coordination number? Answer: 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? Answer: 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? Answer: V=4/3 πr³
⩥ What are the examples of ceramics with rock salt structure (NaCl)?
Answer: Examples include NaCl, MgO, MnS, LiF, and FeO.
⩥ What is the coordination number and structure of the CsCl
structure? Answer: Coordination number = 8, anions @ corners of a
cube, single cation @ center.
⩥ What is the coordination number and structure of the zinc blende
structure (ZnS)? Answer: 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? Answer:
AX2 subdivision: coordination number is 8 and an example is CaF2,
rc/ra = 0.8. (Ca - center, F - corners)
⩥ What is AmBnXp - Type? Answer: Cubic Structure (consists of 2
cations) ex. BaTiO3
⩥ What may ceramic crystal structures be considered in terms of?
Answer: closedpacked planes of ions, as well as unit cells
Q&A 2026 VIEW AHEAD EXAM.
⩥ Anisotropy Answer: directionality of properties
⩥ What influences the crystal structure of ceramics? Answer: The
electrical charge of ions and the relative sizes of the anion and cation.
⩥ Why must a ceramic molecule be neutral? Answer: 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?
Answer: 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?
Answer: The most common coordination numbers in ceramics are 4,
6, and 8
⩥ What happens when the ratio of the radii is greater than 1? Answer:
The coordination number is 12.
,⩥ What are the 3 types of ceramic crystal structures? Answer: AX,
AmXp, and AmBnXp Type
⩥ What are the 3 subdivisions of AX- Type ceramic structure?
Answer: 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? Answer: 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? Answer: 4 anions and 4 cations.
⩥ What is the main relationship between the unit cell and cesium
chloride structure (CsCl)and its coordination number? Answer: 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? Answer: 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? Answer: V=4/3 πr³
⩥ What are the examples of ceramics with rock salt structure (NaCl)?
Answer: Examples include NaCl, MgO, MnS, LiF, and FeO.
⩥ What is the coordination number and structure of the CsCl
structure? Answer: Coordination number = 8, anions @ corners of a
cube, single cation @ center.
⩥ What is the coordination number and structure of the zinc blende
structure (ZnS)? Answer: 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? Answer:
AX2 subdivision: coordination number is 8 and an example is CaF2,
rc/ra = 0.8. (Ca - center, F - corners)
⩥ What is AmBnXp - Type? Answer: Cubic Structure (consists of 2
cations) ex. BaTiO3
⩥ What may ceramic crystal structures be considered in terms of?
Answer: closedpacked planes of ions, as well as unit cells
