| 摘要 |
<p>The invention relates to iron-silicon oxide particles, a) having a spherical and/or spheroid shape and comprising two segments, wherein one segment is made substantially of amorphous silicon dioxide and the other segment is made substantially of iron oxide, b) exhibiting, in an X-ray diffraction chart generated by means of a diffractometer using CuK alpha radiation, a voltage U of 40 kV, and a current I of 40 mA b1) a diffraction reflex 1, the maximum signal level 1 thereof being at a diffraction angle 2 T = 32 to 34° and b2) a diffraction reflex 2, the maximum signal level thereof being at a diffraction angle T = 34.5 to 36.5°, wherein b3) q = 0.2 to 20, where q is defined as the maximum signal level 2 / maximum signal level 1.</p> |
