Engineering Materials and Metallurgy: Unit 0: Review of Crystal Physics

Void Space (or Interstitial Space)

Definition, Formula, Calculation | Crystal Physics

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The void space in the unit cell is the vacant space left unutilized in the cell.

Void Space (or Interstitial Space)

✓ The void space in the unit cell is the vacant space left unutilized in the cell.

✓ It is equal to (1 - APF). It is often expressed as percentage.

⸫ Void Space = (1-APF) × 100

Calculation of void space

Void spaces are calculated as follows for various structures.

1. Simple Cubic (SC) structure

A.P.F for SC lattice = 0.52

⸫ Void space = (1 - APF) × 100 

                       = (1-0.52) × 100 = 48%

2. Body Centred Cubic (BCC) structure

A.P.F for BCC lattice = 0.68

⸫ Void space = (1 - APF) × 100

                      = (1 - 0.68) × 100 = 32%

3. Face Centred Cubic (FCC) structure

A.P.F for FCC lattice = 0.74

⸫ Void space = (1 - APF) × 100

                      = (1 - 0.74) × 100 = 26%

4. Hexagonal Close Packed (HCP) structure

A.F.F for HCP lattice = 0.74

⸫ Void space = (1 - APF) × 100

                      = (1 - 0.74) × 100 = 26%

Engineering Materials and Metallurgy: Unit 0: Review of Crystal Physics : Tag: : Definition, Formula, Calculation | Crystal Physics - Void Space (or Interstitial Space)

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Engineering Materials and Metallurgy: Unit 0: Review of Crystal Physics


Review of Crystal Physics - Introduction

Classifications of solids - Crystal Physics

Crystallographic Terms

Crystal Systems (or Types of Crystals)

Bravais Lattices - Crystal Physics

Summary of Bravais Lattices - Crystal Physics

Crystal symmetry - Crystal Physics

Simple crystal structures

Unit Cell Characteristics - Crystal Physics

Coordination Number - Definition, Calculation | Crystal Physics

Atomic Radius - Definition, Formula, Calculation | Crystal Physics

Atomic Packing Factor (APF) - Definition, Formula, Calculation | Crystal Physics

Void Space (or Interstitial Space) - Definition, Formula, Calculation | Crystal Physics

Relation between Lattice Constant (a) and Density (ρ) - Crystal Physics

Summary of Characteristics of the Unit Cells - Crystal Physics

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