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What is the meaning of a decimal in a subscript in a chemical formulas? e.g. Co28.6FeTa4.3B8.7O46

See http://www.nature.com/articles/ncomms13497What is the meaning of a decimal in a subscript in a chemical formulas?

"We introduce oxygen into a ferromagnetic metallic glass to form a Co28.6Fe12.4Ta4.3B8.7O46 magnetic semiconductor withI came across the fractional subscripts in a Curie temperature above 600 K. "publication,[1] for example:

We introduce oxygen into a ferromagnetic metallic glass to form a $\ce{Co_{28.6}Fe_{12.4}Ta_{4.3}B_{8.7}O46}$ magnetic semiconductor with a Curie temperature above $\pu{600 K}$. "

How do I interpret these numbers?

References:

  1. Liu, W.; Zhang, H.; Shi, J.; Wang, Z.; Song, C.; Wang, X.; Lu, S.; Zhou, X.; Gu, L.; Louzguine-luzgin, D. V.; Chen, M.; Yao, K.; Chen, N. A room-temperature magnetic semiconductor from a ferromagnetic metallic glass. Nat. Commun. 2016, 7, 13497 DOI: 10.1038/ncomms13497.

What is the meaning of a decimal in a subscript in a chemical formulas? e.g. Co28.6FeTa4.3B8.7O46

See http://www.nature.com/articles/ncomms13497

"We introduce oxygen into a ferromagnetic metallic glass to form a Co28.6Fe12.4Ta4.3B8.7O46 magnetic semiconductor with a Curie temperature above 600 K. "

What is the meaning of a decimal in a subscript in a chemical formulas?

What is the meaning of a decimal in a subscript in a chemical formulas?

I came across the fractional subscripts in a publication,[1] for example:

We introduce oxygen into a ferromagnetic metallic glass to form a $\ce{Co_{28.6}Fe_{12.4}Ta_{4.3}B_{8.7}O46}$ magnetic semiconductor with a Curie temperature above $\pu{600 K}$. "

How do I interpret these numbers?

References:

  1. Liu, W.; Zhang, H.; Shi, J.; Wang, Z.; Song, C.; Wang, X.; Lu, S.; Zhou, X.; Gu, L.; Louzguine-luzgin, D. V.; Chen, M.; Yao, K.; Chen, N. A room-temperature magnetic semiconductor from a ferromagnetic metallic glass. Nat. Commun. 2016, 7, 13497 DOI: 10.1038/ncomms13497.
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