Table 3.

MIR peak positions (cm⁻¹) along with those reported for bulk iron (oxyhydr)oxides

Hem100915			779	706		664	628	604s		518	433					279
α-Fe2O3a,b,c				700b						525a	443a	~380–400c		~335–310c		229c
Origina,b,c				Fe–OH			Eu			Fe–O	Eu	A2u	Eu	A2u	Eu	Eu
							Fe–O				Fe–O	Fe–O	Fe–O	Fe–O	Fe–O	Fe–O
Goet011515		883	788		671		629	590		483s	450		382	334	298s	249
Goet012315		883	786	697s	671	663s	626	590		486s	447		392	342	297s	256
α-FeOOHa		839	794		670		633			497	450	409	361			268
Origind,e		B2u	B1u		δOH		νFe–O			νFe–Oasym	νFe–O	νFe–Oasym	νFe–Osym			νFe–Osym
		δOH	γOH
Lep030415	1157	1020		741	669		629	604	583	507s	452		338		245	217
γ-FeOOHf	1150	1018		752					610	510	478		357		270	223
Originf	B2u	B3u		B1u					B3u	B2u	B1u		B2u		B1u	B3u
	δOH	δOH		δOH						τO			τOH
Ak102315		837	816		677s		634				469s	416s	363		252	224
β-FeOOHg		845s	817		698		644s				470s	422
Origing							δOH				Fe–O	Fe–O
Mag060516									547					346
Fe3O4c									560					350	270	210
Originc									T1u					T1u	T1u	T1u
									Fe–O					Fe–O	Fe–O	Fe–O
Magh061815			773s	706					541			433		343
γ-Fe2O3c									553			440		319
Originc									T2			T2		T2
									Fe–O			Fe–O		Fe–O
Fh				698				602				434			278
5Fe2O3.9H2Oe				650								450
Origine				defOH								defOH

Bold, underlined values are considered diagnostic features. Site symmetries and participating atoms are listed where known

Errors in peak positions are smaller than the resolution of the measurement (4 cm⁻¹) but can vary substantially with continuum removal method. See text for details

def deformation, asym asymmetric, sym symmetric, s shoulder

^aParikh et al. (2014)

^bBarrón et al. (2003)

^cChamritski and Burns (2005) and references therein

^dBlanch et al. (2008)

^eCornell and Schwertmann (2006)

^fLewis and Farmer (1986)

^gMurad and Bishop (2000); Bishop et al. (2015)