Supplemental material
Partially inverse spinel ZnFe2O4 with high saturation magnetization
synthesized via a molten salt route
Jiangtao Wu1, Nan Li1, Jun Xu1, Yaqi Jiang1, Zuo-Guang Ye1,2*, Zhaoxiong Xie1*, and Lansun
Zheng1
1
State Key Laboratory for Physical Chemistry of Solid Surface & Department of Chemistry,
College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
2
Department of Chemistry and 4D LABS, Simon Fraser University, 8888 University Drive,
Burnaby, British Colombia, V5A1S6 Canada
Figure S1. Non-magnetic part of the molten salt synthesis: () ZnO, () -Fe2O3.
Figure S1 shows the XRD patterns of non-magnetic part of molten salt synthesis, consisting
of ZnO and -Fe2O3. These by-products were separated from PI-ZFO with a magnet.
1
Figure S2. XRD patterns of inversed spinel LiFe5O8.
Figure S2 shows the inversed spinel LiFe5O8 prepared by mixing 1 mmol Fe2(SO4)3 5H2O and
0.1 mol LiCl H2O and heating at 850 °C for 1 hour. The product has been washed by distilled
water to remove excess LiCl. Diffraction patterns can be well indexed by inversed spinel LiFe5O8.
(JCPDS No. 13-0273)
2
Figure S3. XRD patterns of the final product of LiFe 5 O8 powder reacting with ZnSO47H2O
at 850 °C without LiCl for 1 hour. (): ZnFe2O4, () ZnO, () -Fe2O3.
1 mmol LiFe5O8 powder and 2.5 mmol ZnSO47H2O were grinded without LiCl H2O. The
mixture was heated at 850 °C for 1 hour. XRD pattern (Figure S3) reveals the products are the
mixture of ZnFe2O4, ZnO and -Fe2O3. However, this ZnFe2O4 product is antiferromagnetic.
3
Table SІ. Reported values of saturation magnetization and coercive field for ZnFe2O4 prepared
by various methods.
MS
(emu.g-1)
Coercive Temperature Size
field (Oe)
(K)
(nm)
Synthesis method
Ref.
80
117
65.4
38
7
19
102.4
114
300
2
10
6
5000
5000
9.8
4
Molten salt
Molten salt
Thermal decomposition
Hydrothermal method
This work
This work
1
2
25
400
5
12
Sonochemical emulsification
3
76.8
42.5
200
400
5
5
6.6
14.8
Polyol hydrolysis
Polyol hydrolysis
4
4
70
310
3
3.7
Micelles
5
30
650
3
2.8
Micelles
5
61.87
54.64
11.9
110
50
544.8
80
300
2
300
300
32
Hydrothermal
Hydrothermal
Self-propagating combustion
6
6
7
37
73
10
88.4
56.6
Not given
15
Not given
Not given
Not given
4.2
10
300
4.2
300
47
Ball milling
10
Aerogel procedure+ball milling
11
Ball milling
10
Ball milling
Thin film Pulsed laser deposition
20.7
40.3
58
35
Not given
Not given
Not given
Not given
4.2
4.2
5
4.2
36
50
9
5.5
8
9
10
11
12
Ball milling
13
Ball milling +calcinations at 773 K 13
Ball milling
14
Coprecipitation
15
Table SІ presents the values of saturation magnetization and coercive field for ZnFe2O4 so far
reported in literatures, in comparison with values obtained in this work. It can be found from these
data that the saturation magnetization of our PI-ZFO is the highest to date (117 emu/g at 2 K, 80
emu/g at 300 K). Furthermore, the coercive field of our PI-ZFO is almost one-tenth of those
reported both at 300 K and 2 K.
4
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