X射线-物相XRD-PDF4学习资料-01：2D Diffraction-Basics

Use

2D

PatternsUse

2D

PatternsRing

Pattern

for

Cerium

Indium

Platinum

A

graphical

2D

diffraction

pattern,

or

Ring

Pattern,

can

be

produevery

entry

in

the

ICDD

PDF-4+

database.

A

Ring

Pattern

provides

a

2-dimensional

simulation

ofthe

X-ray

pattern

for

a

givenphaseas

it

would

appear

ona

flat

2-dimensional

detectorsuch

as:Photographic

filmPhosphor

image

platesSolid

state

arraysUse

2D

PatternsEach

ring

corresponds

to

a

peak

(d-spacing

and

intensity),

calculated

usinCrystallite

Size

parameter

specified

in

the

‘Ring

Pattern’.The

higher

the

intensity,

the

brighter

the

ring.1865100Ring

Pattern

for

Cerium

Indium

PlatinumPeak

list

for

Cerium

Indium

PlatinumUse

2D

PatternsThe

simulation

assumes:No

preferred

orientation

in

the

specimen

Uniaxial

positioning

of

the

detector

(transmission

geometry

with

incibeam

centered)Infinite

number

of

randomly

oriented

crystallitesRing

Pattern

for

Iron

Ruthenium

SiliconRing

Pattern

for

Potassium

Boron

HydrideRing

Pattern

Preferences

There

are

various

preferences

used

to

control

how

the

Ring

Pattern

iscalculated

and

displayed.Plot

SizeCamera

LengthCrystallite

SizeColorsWavelength

New

for

2011:

You

candynamically

change

thepreferences

on

the

form

forthat

individual

Ring

Pattern.Ring

Pattern

for

Cerium

Indium

PlatinumRing

Pattern

Preferences

Alternatively,

you

can

change

the

preferences

for

alRing

Patterns

by

using

the

Ring

Pattern

Preferencesform.Click

Preferencesin

the

Edit

menuRing

Pattern

PreferencesRing

Pattern

PreferencesThe

Wavelength

of

the

Ring

Pattern

can

be

set

using

thecombobox.To

change

the

wavelength

for

all

Ring

Patterns,

use

the

Simulated

Profile

PreferencRing

Pattern

for

Cerium

Indium

Platinum1.54056Å

WavelengthRing

Pattern

PreferencesThe

Crystallite

Size

parameter

(in

Å)

affects

the

broadness

of

tNarrow

rings

correspond

to

larger

Crystallite

Sizes.Ring

Pattern

for

Sodium

Gallium

Silicon

OxideDiffraction

Pattern

for

Sodium

Gallium

Silicon

Oxide500Å

Crystallite

sizeNarrow

peaks/ringsRing

Pattern

PreferencesThe

Plot

Size

controls

the

detector

dimensions

(width

and

height

in

cIf

the

Ring

Pattern

is

not

visible

on

the

form,

try

increasing

the

PlotRing

Pattern

for

Cerium

Indium

Platinum25cm

Plot

SizeRing

Pattern

Preferences

The

Camera

Length

controls

the

sample-to-detector

distancecm).Ring

Pattern

for

Cerium

Indium

Platinum20cm

Camera

LengthRing

Pattern

Preferences

The

Scale

Background

and

Scale

Font

colors

control

theappearance

of

the

Ring

Pattern.Ring

Pattern

for

Cerium

Indium

PlatinumYellow

foregroundwith

blue

backgroundRing

Pattern

ManipulationDrag

the

slider

tozoomDrag

the

scrollbars

to

panRing

Pattern

for

Cerium

Indium

PlatinumClick

to

resetzoomDouble-click

anywhere

toreset

zoomThank

you

for

viewing

our

tutorial.Additional

tutorials

are

available

at

the

ICDD

website.International

Centre