Notes

Teflon is a brand name for polytetrafluoroethylene (PTFE), a high-performance plastic. The chemical formula for PTFE is (C2F4)n, meaning it is composed of carbon (C) and fluorine (F) atoms.

You're getting EDX (Energy-dispersive X-ray spectroscopy) peaks for barium (Ba), fluorine (F), sulfur (S), silicon (Si), and oxygen (O). These elements could be part of the coating or the material of the plate itself.

The elements you have mentioned can form various compounds:

1. Barium sulfate (BaSO4): Barium and sulfur might be present in the form of barium sulfate. Barium sulfate is a white crystalline solid that is insoluble in water. It's used as a pigment in paints and as a filler in plastics. It could be part of the coating to increase the hardness or heat resistance.

2. Silicon dioxide (SiO2): Silicon and oxygen could form silicon dioxide, also known as silica. Silica is commonly used in ceramics and glasses. In this case, it might be part of a ceramic coating, which could provide non-stick properties and heat resistance.

Now, you have mentioned BaO4S, but this is not a standard compound. You may be referring to BaSO4 (barium sulfate), which is a common compound of barium.

In terms of other compounds that might be present, here are a few possibilities:

1. Aluminum oxide (Al2O3): Since the plate is predominantly aluminum, the presence of oxygen might indicate the formation of aluminum oxide on the surface. This can occur naturally as aluminum reacts with oxygen in the air. Aluminum oxide layers can provide some level of protection against further oxidation or corrosion.

2. Various silicates: Silicates are compounds containing silicon, oxygen, and usually one or more other elements. If aluminum is present, you might see aluminosilicates, which could be part of a ceramic coating.

3. Fluorides: Since fluorine is present, it's possible that you might have various fluorides. Given the elements you've listed, possibilities could include aluminum fluoride (AlF3) or silicon tetrafluoride (SiF4). However, since PTFE is present, the fluorine peak in the EDX might largely be coming from the PTFE.

Remember, EDX tells you what elements are present, but not how they are bonded together. Therefore, interpreting EDX results involves some educated guessing based on what compounds are commonly used in these types of applications. XRD (X-ray diffraction) can provide more information about the crystalline structures present, which can help identify specific compounds.