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Introduction to Solid State > Periodicity > Flashcards

Periodicity Flashcards

1
Q

what is a lattice point

A

points in a periodic pattern that all have identical environments

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2
Q

what is a lattice

A

the periodic collection of lattice points

describes periodic nature of the pattern

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3
Q

what is a unit cell

A

the smallest unit that generates the entire pattern

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4
Q

what is a primitive lattice

A

it has no atom in the centre of the unit cell

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5
Q

what is a centred lattice

A

it has an atom in the middle of the unit cell

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6
Q

where does the alpha angle lie

A

between b and c axis

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7
Q

where does beta angle lie

A

between a and c axis

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8
Q

where does angle gamma lie

A

between a and b axis

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9
Q

which is the a axis

A

the x axis side to side

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10
Q

what is the c axis

A

the z axis u and down

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11
Q

what is the b axis

A

the y axis into the page

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12
Q

where is the a face of a unit cell

A

the b and c axes

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13
Q

where is the b face of a unit cell

A

the a and c axes

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14
Q

where is the c face of a unit cell

A

the a and b axes

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15
Q

what are the seven crystal systems

A 
triclinic
monoclinic
orthorhombic
tetragonal
rhombohedral
hexagonal
cubic
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16
Q

what are the parameters for triclinic

A

all parameters are independent

17
Q

what are the parameters for monoclinic

A

the axis are independant alpha and gamma are both 90 whereas beta is not 90

18
Q

what are the parameters for orthorhombic

A

independant axes

alpha beta and gamma are all 90

19
Q

what are the parameters for tetragonal

A

a and b are the same but different to c

alpha beta and gamma are all 90

20
Q

what are the parameters for rhombohedral

A

all axes are the same

alpha and beta are 90 but gamma is not

21
Q

what are the parameters for hexagonal

A

a and b are the same but different to c

alpha and beta are 90 and gamma is 120

22
Q

what are the parameters for cubic

A

a b and c are the same

alpha beta and gamma are all 90

23
Q

what is P in 3D lattice types

A

primitive

24
Q

what is C in 3D lattice types

A

additional lattice points at the centre of the c face

25
Q

what is I in 3D lattice types

A

body centred, additional lattice points at the centre of the unit cell

26
Q

what is F in 3D lattice types

A

face centred

additional lattice points at the centres of all unit cell faces

27
Q

physical properties of molecular structures

A

gases, liquids or soft brittle solids

28
Q

physical properties of covalent network structures

A

hard and brittle solids

29
Q

physical properties of metals

A

hard solids but malleable and ductile

30
Q

physical properties of ionic compounds

A

hard and brittle solids

Introduction to Solid State (4 decks)

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