Table 4 O-O distances of Al-substituted hematite samples obtained by Rietveld structure refinement analysis.

From: Mechanisms on the morphology variation of hematite crystals by Al substitution: The modification of Fe and O reticular densities

 

O1-O2

O1-O3

O2-O3

O1-O4

O1-O5

O4-O5

O-Oab*

O1-O6

O-Oc*

Hem

2.726 (5)

2.726 (5)

2.726 (5)

3.004 (2)

3.004 (2)

3.004 (2)

2.865

2.789 (2)

2.789 (2)

AlH1

2.717 (3)

2.717 (3)

2.717 (3)

3.007 (2)

3.007 (2)

3.007 (2)

2.862

2.785 (1)

2.785 (1)

AlH3

2.689 (3)

2.689 (3)

2.689 (3)

3.019 (2)

3.019 (2)

3.019 (2)

2.854

2.777 (0)

2.777 (0)

AlH5

2.750 (4)

2.750 (4)

2.750 (4)

2.984 (2)

2.984 (2)

2.984 (2)

2.867

2.793 (1)

2.793 (1)

AlH7

2.809 (4)

2.809 (4)

2.809 (4)

2.952 (1)

2.952 (1)

2.952 (1)

2.8805

2.810 (1)

2.810 (1)

AlH9

2.815 (4)

2.815 (4)

2.815 (4)

2.946 (1)

2.946 (1)

2.946 (1)

2.8805

2.811 (1)

2.811 (1)

AlH11

2.832 (5)

2.832 (5)

2.832 (5)

2.933 (2)

2.933 (2)

2.933 (2)

2.8825

2.815 (1)

2.815 (1)

AlH13

2.870 (5)

2.870 (5)

2.870 (5)

2.912 (2)

2.912 (2)

2.912 (2)

2.891

2.827 (1)

2.827 (1)

  1. *O-Oab is the average of O1-O2, O1-O3, O2-O3, O1-O4, O1-O5, O4-O5 bonds, while the O-Oc is O1-O6 bond.