MTL 200 LATEST 2026 TEST PAPER QUESTIONS AND
SOLUTIONS GUARANTEE A+
✔✔What does the negative sign mean in the Ficks First Law equation? -
✔✔Decreasing/ high to low
✔✔Diffusion flux in steady state diffusion? - ✔✔Constant through time
✔✔How are fibre classes defined in terms of materials? - ✔✔Could either be
amorphous or polycrystalline.
✔✔The # of Vacancies points, how does it increase? (What function does it obey) -
✔✔Exponential
✔✔ 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? - ✔✔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
SOLUTIONS GUARANTEE A+
✔✔What does the negative sign mean in the Ficks First Law equation? -
✔✔Decreasing/ high to low
✔✔Diffusion flux in steady state diffusion? - ✔✔Constant through time
✔✔How are fibre classes defined in terms of materials? - ✔✔Could either be
amorphous or polycrystalline.
✔✔The # of Vacancies points, how does it increase? (What function does it obey) -
✔✔Exponential
✔✔ 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? - ✔✔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
