2. The basic building blocks of Crystalline state‏ ‏
Crystal Structure
‘Basis and Lattice ’
The basic building blocks of Crystalline state‏ ‏
Author
Sachin Patil
Title of the concept

3. Objectives: After interacting with this Learning object; you will be able to:
Identify crystal structure formed given a lattice and a basis.
Title of the concept

4. Master layout or diagram
INSTRUCTIONS SLIDE 1
Master layout or diagram
Make a schematic diagram of the concept
Explain the animator about the beginning and ending of the process.
Draw image big enough for explaining.
In above image, identify and label different components of the process/phenomenon. (These are like characters in a film)‏
Illustrate the basic flow of action by using arrows. Use BOLD lines in the diagram, (minimum 2pts.)‏
In the slide after that, provide the definitions of ALL the labels used in the diagram 2 3 4 5

5. Master Layout (Lattice)‏1
FIG 1: 2 3
Lattice 4 5 5

6. 1 Master Layout (Basis )‏ 2 3 Basis 4 5 (a)‏ (b)‏ (c)‏ (d)‏
FIG 2: A list of basis 2
(a)‏
(b)‏ 3
Basis
(c)‏
(d)‏ 4 5 6 6

7. Master Layout (Crystal structure)‏
FIG 3: Crystal structures formed with lattice (fig1) and basis (fig2)
(c)‏
(a)‏
(b)‏
(d)‏
Each crystal structure refers to its respective basis fig 2

8. 2 Master Layout (Crystal Structure [lattice +basis]) 1 3 4 5 FIG 4:
Crystal structure formed
Basis 3 4 5 8 8

9. 2 Master Layout (Crystal Structure [lattice +basis]) 1 3 4 5 FIG 5:
Crystal structure formed
Basis 3 4 5 9 9

10. 2 Master Layout (3D 2 layers Crystal Structure [lattice +basis]) 1 3 4
FIG 6: 3
2 layer lattice
Basis 1
Basis 2 4
Basis 3
Basis 4 5 10 10

11. 2 Master Layout (3D 3 layers Crystal Structure [lattice +basis]) 1 3 4
FIG 7: 3
3 layer lattice
Basis 1
Basis 2 4
Basis 3
Basis 4 5 11 11

12. 1 Definitions of the components: 2 3 4 5 Basis Lattice
Group of atoms is called ‘Basis’
Basis may consist of single atom or a group of atoms.
Lattice
Lattice is a regular periodic array of points in space.
‘Lattice’ can be assumed as a series of points (which can go up to infinity) in two dimension space.
The arrangement of points about a given point is identical with that about any other point. 2 3 4 5 12

13. 1 Definitions of the components: 2 3 4 5 Crystal Structure
When Basis (group of atoms) is repeated in space, it forms a ‘crystal structure’.
In other words, the structure of all crystals can be described in terms of a lattice, with a group of atoms attached to every lattice point. 2 3 4 5 13

14. Stepwise description of process1
The goal of the IDD is to provide instructions to an animator who is not a expert.
You have to describe what steps the animator should take to make your concept come alive as a moving visualization.
Use one slide per step. This will ensure clarity of the explanation.
Add a image of the step in the box, and the details in the table below the box.
You can use any images for reference, but mention about it's copyright status
The animator will have to re-draw / re-create the drawings
Add more slides as per the requirement of the animation 2 3 4 5

15. 3 Interactivity Step 1: 1 2 4 5 Crystal structure Basis Lattice 1‏ 2‏
Chosen
basis 3 3 4
Interactivi ty type and action
Options
Boundar y limit
Feedback
Results
Single selection
Drop down for options to be chosen by the learner
Choose any one basis and click on the correct crystal formation:
(a)
(b)
(c)
(d)
The lattice appears after the basis is chosen and the crystal structures with it along with plus and equal too sign
------
Wrong answer chosen then
“ Look carefully at the basis and the crystals structure and try again!”
Correct answer
“ try another basis”
Basis (a) correct answer 1
Basis (b) correct answer 2
Basis (c) correct answer 3
Basis (d) correct answer 4 4 5

16. Description of the action1
Step 2:
List of basis
Lattice 2
(a)‏
(b)‏ 3
(c)‏
Action
Description of the action
Audio Narration
Choose any one basis fro the given list of basis to see the crystal structure formation
Click on the basis the others disappear and the animation begins.
Once the learner chooses any one basis from the list of basis the result for (a) (b) (c) and in fig 3 in the master layout.
The basis is shown coming one by one on each point.
After animation with one is over other three appear then other two till all basis are shown.
Every point in lattice can hold only one basis set of the same type.
The selected basis is repeated at all the points throughout the lattice 4 5

17. Description of the action1
Step 3:
List of basis 2
(a)‏
(b)‏ 3
(c)‏
2 layers
3 layers 4
Action
Description of the action
Audio Narration
1. Click on the 3 dimensional lattice layer of your choice.
2. Next click to select any one basis to see the crystal structure formed.
3. Now choose another basis
Only choice in layer appears with the action 1.
Then click on the basis of their choice with action 2.
After the choice the crystal structure for that basis and that layer is shown with the basis replacing the grey circles on the lattice one by one. (ref fig 6&7)
Action 3. appears and learner is asked to chose another basis till all are over with the lattice
Similar type 2D layers contribute to 3D Crystal Structure (with constant distance between them). 5

18. Description of the action1
Step 4:
List of basis 2
(a)‏
(b)‏ 3
(c)‏
2 layers
3 layers 4
Action
Description of the action
Audio Narration
1. Now choose another lattice.
2. Now click on any of the basis to see the crystal structure formed.
3. Choose another basis.
Only choice in layer appears with the action 1 (with only other layer lattice clickable)
Then click on the basis of their choice with action 2.
After the choice the crystal structure for that basis and that layer is shown with the basis replacing the grey circles on the lattice one by one. (ref fig 6&7)
Action 3. appears and learner is aske dto chose another basis till all are over with the lattice
Similar type 2D layers contribute to 3D Crystal Structure (with constant distance between them). 5 18

19. 3 Interactivity Step 5: 1 2 4 5 Lattice Basis: Lattice ref to fig 6-7
Result ref to fig 6-7 3
Interactivit y type and action
Options
Feedback
Boundary limits
Results
Single selection
Drop down for the basis and lattice layer options
Select the basis and lattice layer of your choice and then click on the correct crystal structure:
Basis:
(a)
(b)
(c)
Lattice: 2 and 3 layer lattice fig 6-7
Wrong answer chosen then “ Look carefully at the basis and the crystals structure and try again!”
Correct answer “ try another basis”
No of Lattice layers
2 – 3 refer to (fig 6-7)
Only three basis
All the three (a, b, and c) crystal structures appear depending on layer chosen:
If 2 layers chosen then fig 6 crystals structures for basis 1, 2 and 3 appear. Same is with 3 layer lattice. Basis (a) correct answer 1 for each layer
Basis (b) correct answer 2 for each layer
Basis (c) correct answer 3 for each layer
Refer to fig (6-8) 4 5

20. 3 Interactivity Questions Step 6: 1 2 4 5 Lattice Crystal structure
Basis 2
Show the
chosen basis 3
Interactivity type and action
Options
Feedback
Boundary limits
Results
Drop down
Choose the basis that forms the crystal structure for the given lattice.
Feed back for wrong answer: “Look care full at the crystal structure and try again.”
Feed back for wrong answer: “Congratulations you have got it right proceed to the next question.”
One lattice only
One crystal structure
a., c., d. are wrong answers:
b is the correct answer 4
(a)‏
(b)‏
(c)‏ 5
(d)‏ 20

21. 3 Interactivity Questions Step 7: 1 2 4 5 Lattice Crystal structure
Basis c. 2 b. 3
Interactivit y type and action
Options
Feedback
Boundary limits
Results
Drop down
Change the lattice.
Given the basis and the new lattice what is the crystal structure formed?
Option:
triangle lattice
Show this fig
Feed back for wrong answer: “You are incorrect, follow the link to see the animation.”
(give the link for the triangle IDD)
Feed back for wrong answer: “Congratulations you have got it right confirm your answer and follow the link to see the animation.”
One lattice only
One crystal structure
a., c., are wrong answers:
b is the correct answer 4 5 21

22. Animation design 1
Please see the design template provided in the next slide.
This is a sample template, and you are free to change as per your design requirements.
Try and recreate the sections/subsections as shown in the template. 2 3 4 5

23. Formula with derivation Test your understanding
Credits
What will you learn
2 Layer
3 Layer
Play/pause
Restart
Basis
Lattice
Lets Learn!
Interactivity options
Sliders(IO1)‏
/ Input Boxes(IO2)‏
/Drop down(IO3)‏
(if any)‏
Definitions
Concepts
Assumptions (if any)‏
Formula with derivation
(if any)‏
Animation Area
Graphs/Diagram
(for reference)‏
Test your understanding
(questionnaire)‏
Lets Sum up (summary)‏
Want to know more…
(Further Reading)‏

24. Interactivity and Boundary limits1
Interactivity and Boundary limits
In this section, you will add the ‘Interactivity’ options to the animation.
Use the template in the next slide to give the details.
Insert the image of the step/s (explained earlier in the Section 3) in the box, and provide the details in the table below.
The details of Interactivity could be:
Types: Drop down, Slider bar, Data inputs etc.
Options: Select one, Multiple selections etc
Boundary Limits: Values of the parameters, which won’t show results after a particular point
Results: Explain the effect of the interaction in this column
Add more slides if necessary 2 3 4 5

25. 3 Interactivity : 1 2 4 5 Interactivity type and action Options
Feedback
Boundary limits
Results
For interactivity refer to slide no 15 and 19 step No 1 and 5 4 5 25

26. Links for further reading
Reference websites:
Books:
Solid State Physics – A J Dekker
Introduction to Solid State Physics – Charles Kittel
Solid State Physics – Ashcroft / Mermin 26

27. Title of the concept Summary:
Every point in lattice can hold only one basis set of the same type.
The selected basis is repeated at all the points throughout the lattice.
Similar type 2D layers contribute to 3D Crystal Structure (with constant distance between them).
Title of the concept