264
S. G. Nedilko
Table 15.2 Lattice periods (d hkl , nm) and crystallinity (k, %) for cellulose samples: starting
microcellulose (SC), un-doped micro-/nanocellulose (C0), MCC-oxide micro-/nanocomposites
with K 2 Eu(PO 4 )(MoO 4 ) oxide concentration 0.2% (C1), 2.2% (C2), and 18.2% (C3) [48]
Sample
d 110
d 200
d 004
k
SC
5.56
3.95
2.60
66
C0
5.85
4.02
2.62
56
C1
5.79
3.95
2.62
57
C2
5.72
3.98
2.61
58
C3
5.55
3.95
2.60
58
-150 -100
-50
0
50
100
0.0
0.2
0.4
0.6
20
50
t [ °C]
t [ °C]
0.0
0.5
1.0
h)
f)
d)
b)
10
20
0.0
0.2
0.4
0.6
5
10
0.0
0.1
0.2
5
-150 -100
-50
0
50
100
1
2
3
20
50
2
4
10
20
2
4
5
10
eЈ
eЉ
3
4
g)
e)
c)
5
a)
Fig. 15.9 Dependencies on temperature of the real (a, c, e, g) and imaginary (b, d, f, h) parts of
dielectric permittivity for un-doped cellulose (a, b) and composites (c–h); 10-La 0.7 Sm 0.3 VO 4 (c,
d), 10-La 0.7 Eu 0.3 VO 4 (e, f), and 10-K 2 Eu(PO 4 )(MoO 4 ) (g, h). Frequencies used at experiments
(in kHz) are marked on the figure
Dielectric properties, in other words, dependences of the real (ε / ) and imaginary
(ε // ) parts of the complex dielectric permittivity (ε*) on temperature measured for
studied MCC and MCC-oxide at different frequencies of probing electromagnetic
field (EMF), can be seen on the Fig. 15.9. If we compare the dependences taken
for composites with ones obtained for un-doped MCC (Fig. 15.9a, b), it is easy to
find that general view of these curves is similar. At the same time, some differences