Structure of solids - islam Flashcards Preview

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Flashcards in Structure of solids - islam Deck (13)
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1
Q

What are the four main solid types?

A

Ionic solid, metal, covalent network and molecular solids.

2
Q

What are solid materials important for?

A

Fundamental research and technological applications, such as heterogeneous catalysis, batteries, semiconductors and solar cells.

3
Q

What is body centred cubic structure?

A

It is neither hcp or ccp and is not as common. It has a lattice site at the centre of the cube with atoms at the corners.

4
Q

What is the definition of the unit cell?

A

It is the smallest repeating unit that show the full symmetry of the solid structure which repeat in 3D to give an infinite solid lattice.

5
Q

What are the features of the cubic crystal system?

A

a=b=c, alpha=beta=gamma=90 degrees.

6
Q

What are the features of the tetragonal crystal system?

A

a=b, alpha=beta=gamma= 90 degrees.

7
Q

What are the features of the orthorhombic crystal system?

A

Neither a, b or c are equal, but alpha=beta=gamma= 90 degrees.

8
Q

What are the features of the monoclinic crystal system?

A

Neither a, b or c are equal, alpha=gamma=90, but beta is a different angle.

9
Q

What are the features of the triclinic crystal system?

A

Neither a, b, c, alpha, beta or gamma are equal.

10
Q

What are the features of the hexagonal crystal system?

A

a=b but c is different, alpha=beta=90, but gamma =120.

11
Q

What are the features of the trigonal/rhombohedral crystal system?

A

a=b=c, alpha=beta=gamma are NOT equal to 90 degrees.

12
Q

In terms of radius ratio, what gives the most stable structure?

A

Maximising contact between cations and anions.

13
Q

What is the radius ratio equation?

A

R+/R-