Ali Reza Jahangiri

I attached the calculation of the PB Ratio in the picture. (However, there is one mistake in the picture, The Unit listed in the C4 cell should be in the C5 cell).

You can calculate the PB Ratio yourself and for the formula, you can cite for example the following publication for the equation:

Article Pilling-Bedworth ratio for oxidation of alloys

And you can look for a credible source for the molar weight and density to calculate the PBR.

However, maybe Ag2O is not listed in the PBR lists you mentioned, because it could react with CO2 from the atmosphere to Ag2CO3, but that is just a guess.

Dear Marcus Sommerfeld ,

Thank you for your helpful insight. I will study Xu et al's paper in detail. Although I am now even more curious as to why silver oxide is not mentioned in PBR lists.

Dear Ali Reza Jahangiri

By calculation the Pilling-Bedworth Ratio (PBR) for silver oxide (Ag2O): silver (Ag) is 1.58 as follow.

Ag2O

Molecular mass=231.73 gm/mole

Density=7.14 gm/cm3

No. of mole=1mole

Ag

Molecular mass=107.8 gm/mole

Density= 10.49 gm/cm3

No. of mole= 2mole

PBR= (231.73 gm/mole)( 1mole)( 10.49 gm/cm3)/( 7.14 gm/cm3)( 107.8 gm/mole)( 2mole)

PBR= 1.58

And by attached reference is 1.59

Best regards

Thank you for your detailed calculations Mr Mohammed Hussein j. H. Al'Atia . What is the title of the reference shown in the attached screenshot?

1,59 - it is protective oxide. :)

Mohammed Hussein j. H. Al'Atia

Thanks for correcting my mistake, seems like I accidentally used the Molar Mass of Ag2 instead of Ag in my calculation.