Table 2. Interplanar distances from the XRD spectrum of the MNP samples (Fig. 4). Interplanar distances for magnetite and maghemite (all measured in Å) ^a .

Peak	Magnetite	Maghemite	POFHK(bulk)	Mms6(POFHK)
(220)	2.966	2.950	2.966	2.962
(311)	2.53	2.520	2.534	2.527
(222)	2.419	2.410	2.423	— b
(400)	2.096	2.080	2.097	2.097
(422)	1.712	1.700	1.718	1.711
(511)	1.614	1.610	1.615	1.614
(440)	1.483	1.480	1.483	1.483
(533)	1.279	1.270	1.280	1.276

^aBased on spectra from DIFFRAC Plus software.

^bObscured by the Au (111) peak.