What is green compaction in powder processing? How is the porosity of compacted piece reduced?
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The enthalpy of vacancy formation in nickel is , and its melting point is
. What is the equilibrium vacancy concentration in nickel at
?
Common types of engineering materials are metals, ceramics, polymers and composites. Compare these four classes on the basis of their composition and any two properties. State one application of each type.
Given that the density of molten Ge is 5.60 g cm⁻³ calculate the amount of boron required to obtain 10 kg p-type Ge with dopant concentration of 10¹⁷ cm⁻³. Take density of boron = 2.34 g cm⁻³, atomic weight of boron = 10.811 and k₀ = 0.8.
Why are the metals opaque to visible light and transparent to x-rays and gamma rays?
Explain the working of organic LED.
Write the symmetries associated with the following 2-D defects:
i) Grain Boundary
ii) Twin Boundary
iii) Stacking Fault
Explain Lever rule with appropriate diagram.