[1991Oka] introduced a partial Am-O phase diagram (60-67 at.% O) proposed by [1970Sar]. [2003Thi] revised this phase diagram, as reviewed by [2006Oka]. This phase diagram was superseded by the complete Am-O phase diagram (Fig. 1) reported by [2011Got]. Figure 2 shows the detail of Fig. 1 in the composition range between 58 and 68 at.% O.

Fig. 1
figure 1

Am-O phase diagram

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Fig. 2
figure 2

Enlarged Am-O phase diagram (58 to 68 at.% O)

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Further corroboration may be needed with regard to the following features. The Am2O3 phase shown in [2003Thi] was dimorphic with the transition temperature at about 500°C. [2008Oto] proposed the existence of Am7O12 and Am9O16, which do not fit in Fig. 1. The NaCl-type AmO phase reported earlier by [1967Aki] has not been confirmed since then. This phase may not exist in the stable state.

Table 1 shows Am-O crystal structure data.

Table 1 Am-O crystal structure data
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