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. 2020 Jan 2;10(1):85. doi: 10.3390/nano10010085

Figure 2.

Figure 2

Fourier transform infrared (FT-IR) spectra of iron oxide samples synthesized in hydrothermal conditions at high pressure: NV4 (20 bar), NV5 (60 bar), NV6 (100 bar), and NV7 (1000 bar).