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Questions tagged [ceramics]

Use this tag for ceramics materials and their properties.

2
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1answer
32 views

Synthetic ruby - damaged by heat less than its melting point?

A bit of a jewellery question but chemistry related. I want to encase a synthetic ruby (corundum, Al2O3) in silver by melting the silver around it. Either in a furnace or by casting. The MP of silver ...
5
votes
1answer
50 views

What is the crystal structure of bismuth oxyhydroxyphosphate (BOHP)?

The recent Chemical & Engineering News article Photocatalyst shreds drinking water contaminant PFOA report the following: Cates and his colleagues made an accidental breakthrough while testing ...
4
votes
0answers
31 views

Prince Rupert's Tears - with Alumina?

When molten glass is dropped into water you can get tear shaped objects which are both incredibly strong and which have massive internal stresses. Which means any scratch can cause them to explode. ...
2
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0answers
28 views

Reaction that will produce a silica coating (glaze)

The normal way to create a coating of pure silicon dioxide glaze is to coat the object to be glazed in a slurry of silica particles and then put it in a kiln. However, if I have an object that is too ...
0
votes
0answers
23 views

3D printing of alumina

I want to print a structure of alumina, and the 3D printer that I am using is an extrusion-based printer. So I need your help in knowing that what composition (binders and deflocculant) of alumina ...
1
vote
1answer
141 views

How to get ionic radii for coordination number 12?

I am studying $\ce{ABX3}$ perovskites, and I would like to calculate Goldschmidt tolerance factors for them. The $\ce{A}$ sites in these materials have a coordination number $12$. The Shannon's ...
3
votes
0answers
40 views

“Non-stick” action on ceramic-coated pans

I understand how PTFE, or Teflon as it is commonly called, prevents anything from sticking to pans; apparently, anything coming into contact with the PTFE coating has ignorably tiny van der Waals ...
5
votes
0answers
774 views

Can a solid be both crystalline and amorphous? [closed]

The first line in the Wikipedia article for "Glass" reads: Glass is a non-crystalline amorphous solid that is often transparent and has widespread practical, technological, and decorative usage in, ...
-1
votes
1answer
512 views

Can using isopropyl alcohol on a zirconium oxide ceramic knife harm or dissolve/degrade it? [closed]

Can using isopropyl alcohol to clean a zirconium oxide ceramic knife harm or dissolve/degrade it?
12
votes
1answer
627 views

Why do rare earth metal oxides vary in color so much?

I only know a little about what causes different color, but I know it has to do with the electron orbitals and how they reflect or absorb/emit incoming light. The rare earth metals are in the ...
3
votes
3answers
99 views

Extracting iron oxide from ceramics waste

In my ceramics class, we use iron oxide in our glazes, but a lot of it goes to waste. We have a bucket full of scrap glaze which contains quite a lot of iron oxide, but is also mixed in with silica, ...
5
votes
1answer
987 views

What is the chemical structure of ceramic nonstick coating on pans?

There are lots of pans nowadays that have a ceramic nonstick coating instead of a PTFE coating. However I can not find anything online describing what kind of ceramic such nonstick coatings are. Does ...
3
votes
1answer
95 views

Why does the barium ion in barium titanate move in its tetragonal crystal structure?

Barium titanate is known in the materials science world to be a great dielectric. This is known to be because the $\ce{Ba^2+}$ ion sits off center in the middle of the tetragonal crystal structure. ...
5
votes
1answer
367 views

What does delta letter mean in some ceramics chemical material formula?

Here is a given chemical formula for ceramic material: La0.6Sr0.4Fe0.8Ni0.2O3-δ There is a letter δ. What does it stand for? I guess it is something about oxygen vacancies in crystal lattice.
2
votes
2answers
292 views

Is it safe to hold silicon nitride ceramic without protection?

If I have a complete silicon nitride ball bearing unit, is it safe to hold without any protection? If it cracks, or disintegrates is it also safe?