Chapter 1, Problem 1.1PAE

Interpretation Introduction

Interpretation:

It should be stated whether all the critical materials are rare and the answer should be reasoned out.

Concept introduction:

• Any substance used in technology for which there are no easy substitutes as a result of their unique properties and that is subjected to supply risks due to environmental implications and cost are referred to as critical materials.
• Five rare earth elements, dysprosium, terbium, europium, neodymium and yttrium are considered as critical materials.
• All rare earth elements are not really rare.