# What does this chemical formula mean?

Wikipedia says the formula of aluminum oxynitride is this $\ce{(AlN)_x·(Al2O3)_{1−x}}$, $0.30 \leq x \leq 0.37$ . What does this formula mean?

• I don't even understand it. – Hark Mar 6 '18 at 2:42
• Go through Non-stoichiometric defects of Crystal Lattice , such as metal excess defects, metal deficiency defects etc. You may find your answer – Soumik Das Mar 6 '18 at 2:58
• @Hark Have you been taught the simplest of on-stoichiometric defects? Forget the $x$, instead, do you understand what $\ce{Fe_{1.98}O}$ means? – Gaurang Tandon Mar 6 '18 at 7:05
• No i don't know about that – Hark Mar 6 '18 at 7:07
• @OscarLanzi Oh, sorry. I was about to write $\ce{Fe_{0.98}O}$ to highlight the non-stoichiometric metal deficiency defect. I made a typo by mistake. – Gaurang Tandon Mar 7 '18 at 1:37