Ch. 3 Crystalline Structure Flashcards by jose acosta

Q

Non crystalline =

A

amorphous

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Q

Optical properties of amorphous

A

transparent

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Q

Materials wiith cristals

A

Metals, ceramics, some polymers

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Q

Amorphous materials

A

Complex, rapid cooling, glasses

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Q

Plastics are

A

semi-crystalline

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Q

unit cell measurements

A

10^-9

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Q

Main unit cell types

A

SC, BCC, FCC, HCP

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Q

APF formula

A

(#atoms)(4/3)(pir^3)/a^3

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Q

FCC is similar to

A

hexagonal

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Q

Crystal density

A

p = (#atoms)(atomic weight)/((1 mol)(volume of cell))

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Q

Polyphormism meaning

A

Same element, different crystal structure

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Q

General material density heriarchy

A

metals > ceramics > polymers

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Q

7 types of crystal systems

A

Cubic, Hexagonal, Tetragonal, Rombohedral, Orthorhombic, Monoclinic, triclinic

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Q

Cubic crystal

A

Same distances, 90 degrees on all

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Q

Hexagonal

A

Triangular pattern

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Q

Tetragonal

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A

2 same distances, 90 degrees on all

Q

rombohedral

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A

same distances, 3 same angles, not 90 degrees

Q

orthorhombic

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A

3 different measures, all 90 degrees

Q

monoclinic

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A

3 different distances, one angle not 90 degrees

Q

triclinic

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A

all are different

Q

Position in lattice example

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A

[123]

Q

Plane example in lattice

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A

(123)

Q

Linear density

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A

atoms/length

Q

Planar density

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A

atoms centered/area of plane

Anisotropic properties

depend on crystal direcion

Examples of anisotropic properties

Stifness, Conductivity, Refraction

Isotropic properties

dont depend on crystal direction

Braggs law

n lambda = 2d(hkl)sin(theta)

D(hkl) formula

D(hkl) = a/sqrt(h^2+k^2+l^2)