Density Computation For Ceramics

This problem features the density formula for ceramics.

Density computation for ceramics.

To compute for theoretical density of ceramics five essential parameters are needed and these parameters are number of formula units in unit cell n sum of atomic weights of atoms σa c sum of atomic weights of anions σa a unit cell volume v c and avogadro s number n a. Zm nv where z is the number of atom per unit. Melting points high 600 4000c thermal conductivities are low insulators thermal expansion values are low 1 15 ppm c 3. Calculate the density of feo given that it has the rock salt crystal structure.

First you shall have to determine the bulk density using the formula. Lectures 22 and 23 introduction to ceramics ceramic density calculations example. Or by immersing the uncoated sample in a non. Ceramic density computation a c a v n n a a c σ σ ρ number of formula units unit cell volume of unit cell n number of cations in unit cell ac atomic weight of cation na number of anions in unit cell aa atomic weight of anion vc volume of unit cell na avogadro s number.

Mole sc2o3 0 92 mole hfo2 1 03 mole ceo2 1 4. We use the equation c a fe o c a c a v n n a a v n n a a ρ since the crystal structure is rock salt n 4 formula units per unit cell and. There are many different ways to express density and not using or converting into the proper units will result in an incorrect value. Mass properties e g density ceramics are intermediate density 2 00 6 00 gms cm3 different for allotropes e g glass cristobalite tridymite quartz 2.

The theoretical density of the materials of the anode cathode and electrolyte are used to calculate the porosity of the materials a critical parameter in determining if the fuel cell will function properly. However it is important to pay special attention to the units used for density calculations. Mass volume and then determine the theoretical density from xrd data using. Mole tio2 86 58 mole zro2.

Materials science problem that calculates the number of chemical sio2 units per unit cell of silicon dioxide.