Biomedical Engineering Reference
In-Depth Information
9.13 Morphology of polymer-ceramic nanocomposites with SHMPE
(a) and (b) and i-PP (c) and (d) as binders. Y
1
Ba
2
Cu
3
O
6.97
:binder (wt%)
= 85:15 (a) and (c), 80:20 (b) and (d) [25].
9.6
Influences on the magnetic properties of SC
polymer-ceramic nanocomposites
It is known that high-temperature superconducting (sc) oxide ceramics
possess their own localized magnetic moments, producing a Cu
2+
EPR
signal. Nevertheless, it should be noted that there are two types of copper
atoms in Y
1
Ba
2
Cu
3
O
7
x
ceramics: Cu
2+
(I) and Cu
2+
(II). The first is in the
CuO chain along the axis direction, while the second is in the CuO
2
planes
along the ab plane. For a long time, the nature of the Y
1
Ba
2
Cu
3
O
7
x
ceramics' EPR response was unclear [41].
Investigations [42, 43] have been conducted into the dependence of Cu
2+
EPR signal intensity with simultaneous registration of X-ray absorption
near edges structure (XANES) at the Cu
2+
k edges of the same signals [44],