Would you expect significant scatter in the data for tests of fracture strength

Question

Would you expect significant scatter in the data for tests of fracture strength of a ceramic material? No, For a given ceramic material, the distribution of defects is approximately the same, and determined by thermodynamic conditions. Yes, The fracture strength depends on the existence of internal flaws, which are randomly distributed, and the probability of the existence of a crack is different for each specimen tested. No, Ceramics don't have flaws, so the results should always be the same. Yes, The person doing the test will probably make lots of mistakes, resulting in a large scatter in the results. An AX ceramic is made from an anion with radius 0.25 nm and cation with radius 0.15 nm. What is the most likely crystal structure for this ceramic? Octahedral (like NaCI) Tetrahedral (like ZnS) Triangular (It won't make a 3D crystal) Cubic (like CsCI)

Explanation / Answer

Solution :

Question 29: CORRECT OPTION B: YES

Reason : Because the fracture strength depends on the probability of the existence of the flaw which has the capability to initiate a crack.

Question 30: CORRECT OPTION A :

Here the Radius ratio i.e Rcat/Ran= 0.15/0.25= 0.6

And of the radius ratio is between 0.414-0.732 the structure is Considered to be OCTAHEDRAL and the Nacl has the similar structure.

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