MTL 200 Final Exam Questions and All
Correct Answers 2026 Updated.
What are ceramics? - Answer Ceramics are elements composed of at least two elements,
often more, with complex crystal structures that range from purely ionic to totally covalent.
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
Coordination # of Tetrahedral and Octahedral Position - Answer 1. Tetrahedral Position - 4
2. Octahedral Position - 6
What do Ceramic Crystal structures depend on? - Answer 1. stacking of anion close packed
layers (FCC, HCP)
2. Cations reside in octahedral positions
Correct Answers 2026 Updated.
What are ceramics? - Answer Ceramics are elements composed of at least two elements,
often more, with complex crystal structures that range from purely ionic to totally covalent.
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
Coordination # of Tetrahedral and Octahedral Position - Answer 1. Tetrahedral Position - 4
2. Octahedral Position - 6
What do Ceramic Crystal structures depend on? - Answer 1. stacking of anion close packed
layers (FCC, HCP)
2. Cations reside in octahedral positions
