©BRIGHTSTARS EXAM SOLUTIONS 2024/2025
ALL RIGHTS RESERVED.
MSE 250 Exam Questions With Verified
Answers
Ionic bonding - Answers✔btw metallic and nonmetallic
non-directional
dissimilar en's
requires valence electron transfer
high bonding energies
high melting points
low conductivities
spatial distribution of atoms is detrermined through geometric arrangement of ions only (lattice,
crystal structure)
covalent bonding - Answers✔small diff in en
shared e's
directional bonding
nonmetallic elements or molecules
bonding energies range
magnitude of ionic bond character formula - Answers✔%IC = { 1-exp[-.25(Xa-Xb)^2] } x 100
crystal structure in ceramics - Answers✔spatial distribution of atoms is detrermined through
geometric arrangement of ions only (lattice, crystal structure)
atomic radii affects ionic radius and electric charge
more stable to surround cation with max # anions
must maintain charge neutrality (reflected in chem. formula AmXp)
<0.155 - Answers✔CN = 2
0.155 - 0.225 - Answers✔CN = 3
1
, ©BRIGHTSTARS EXAM SOLUTIONS 2024/2025
ALL RIGHTS RESERVED.
0.225 - 0.414 - Answers✔CN = 4
0.414 - 0.732 - Answers✔CN = 6
0.732 -1 - Answers✔CN = 8
octahedral sites CN - Answers✔CN = 6
tetrahedral sites CN - Answers✔CN =4
FCC sites number - Answers✔4 octahedral
8 tetrahedral
cubic sites CN - Answers✔CN = 8
Rock Salt Crystal Structure - Answers✔CN = 6
Zincblende CS - Answers✔CN = 4
every other tetrahedral site filled
Fluorite CS - Answers✔CN = 8
cation in every second interstitial
density computation - Answers✔n' = number of formula units within the unit cell
sums of atomic weights of all cat/anions
Vcell = unit cell vol.
Na = avogadro's number
Avogadro's number - Answers✔6.02 x 10^23
Cesium Chloride CS - Answers✔CN = 8
how to improve creep resistance - Answers✔increase grain size
choose mat. w/higher Tm
precipitation hardening
Schottky defect - Answers✔cation vacancy and anion vacancy
Frenkel defect - Answers✔a cation vacancy-cation interstitial pair
k - Answers✔Boltzman's constant
2
, ©BRIGHTSTARS EXAM SOLUTIONS 2024/2025
ALL RIGHTS RESERVED.
1.38E-23
Cesium Chloride CS - Answers✔CN = 8
equal number cat and anions
gamma - Answers✔= deltaX/Y = tan(theta)
nu - Answers✔Poisson's ratio
v = -ex/ez
tau - Answers✔= gamma * G
v, E, and G - Answers✔E = 2G(1+v)
Resilience - Answers✔area under curve until yield
Toughness - Answers✔
Toughness - Answers✔Area under curve until fracture
BCC # octahedral and tetrahedral sites - Answers✔6 octahedral
12 tetrahedral
crystallographic direction notation - Answers✔[ 1 1 1 ]
miller indices notation - Answers✔( 1 1 1 )
APF - Answers✔atomic packing factor
n = # atoms/unit cell
Va = volume/atom
Vc = volume/unit cell
theoretical density - Answers✔A = atomic weight
Na = Avogadro's number
Avogadro's number - Answers✔6.02 x 10^23
Miscibility - Answers✔the ability to mix without separating into two phases
Point defects - Answers✔--vacancy
--substitutional
--interstitial (substitutional or self-interstitial)
3
ALL RIGHTS RESERVED.
MSE 250 Exam Questions With Verified
Answers
Ionic bonding - Answers✔btw metallic and nonmetallic
non-directional
dissimilar en's
requires valence electron transfer
high bonding energies
high melting points
low conductivities
spatial distribution of atoms is detrermined through geometric arrangement of ions only (lattice,
crystal structure)
covalent bonding - Answers✔small diff in en
shared e's
directional bonding
nonmetallic elements or molecules
bonding energies range
magnitude of ionic bond character formula - Answers✔%IC = { 1-exp[-.25(Xa-Xb)^2] } x 100
crystal structure in ceramics - Answers✔spatial distribution of atoms is detrermined through
geometric arrangement of ions only (lattice, crystal structure)
atomic radii affects ionic radius and electric charge
more stable to surround cation with max # anions
must maintain charge neutrality (reflected in chem. formula AmXp)
<0.155 - Answers✔CN = 2
0.155 - 0.225 - Answers✔CN = 3
1
, ©BRIGHTSTARS EXAM SOLUTIONS 2024/2025
ALL RIGHTS RESERVED.
0.225 - 0.414 - Answers✔CN = 4
0.414 - 0.732 - Answers✔CN = 6
0.732 -1 - Answers✔CN = 8
octahedral sites CN - Answers✔CN = 6
tetrahedral sites CN - Answers✔CN =4
FCC sites number - Answers✔4 octahedral
8 tetrahedral
cubic sites CN - Answers✔CN = 8
Rock Salt Crystal Structure - Answers✔CN = 6
Zincblende CS - Answers✔CN = 4
every other tetrahedral site filled
Fluorite CS - Answers✔CN = 8
cation in every second interstitial
density computation - Answers✔n' = number of formula units within the unit cell
sums of atomic weights of all cat/anions
Vcell = unit cell vol.
Na = avogadro's number
Avogadro's number - Answers✔6.02 x 10^23
Cesium Chloride CS - Answers✔CN = 8
how to improve creep resistance - Answers✔increase grain size
choose mat. w/higher Tm
precipitation hardening
Schottky defect - Answers✔cation vacancy and anion vacancy
Frenkel defect - Answers✔a cation vacancy-cation interstitial pair
k - Answers✔Boltzman's constant
2
, ©BRIGHTSTARS EXAM SOLUTIONS 2024/2025
ALL RIGHTS RESERVED.
1.38E-23
Cesium Chloride CS - Answers✔CN = 8
equal number cat and anions
gamma - Answers✔= deltaX/Y = tan(theta)
nu - Answers✔Poisson's ratio
v = -ex/ez
tau - Answers✔= gamma * G
v, E, and G - Answers✔E = 2G(1+v)
Resilience - Answers✔area under curve until yield
Toughness - Answers✔
Toughness - Answers✔Area under curve until fracture
BCC # octahedral and tetrahedral sites - Answers✔6 octahedral
12 tetrahedral
crystallographic direction notation - Answers✔[ 1 1 1 ]
miller indices notation - Answers✔( 1 1 1 )
APF - Answers✔atomic packing factor
n = # atoms/unit cell
Va = volume/atom
Vc = volume/unit cell
theoretical density - Answers✔A = atomic weight
Na = Avogadro's number
Avogadro's number - Answers✔6.02 x 10^23
Miscibility - Answers✔the ability to mix without separating into two phases
Point defects - Answers✔--vacancy
--substitutional
--interstitial (substitutional or self-interstitial)
3
