Ferromagnetic hexagonal ferrite powder, method of manufacturing the same, and magnetic recording medium
a technology of hexagonal ferrite and ferromagnetic ferrite, which is applied in the field of can solve the problems of difficult to achieve both of these with conventional ferromagnetic hexagonal ferrite powder, and achieve the effects of improving electromagnetic characteristics, high reliability of use, and rapid increase of recording densities
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embodiment a
[0105]An embodiment in which a water-based solution containing the hexagonal ferrite precursor (also described as a “precursor solution”, hereinafter) and the solution containing the organic modifier (also described as an “organic modifier solution”, hereinafter) are mixed, after which the mixed solution obtained by mixing is introduced into a liquid feed passage to which high-temperature, high-pressure water is being fed.
embodiment b
[0106]An embodiment in which a precursor solution and an organic modifier solution are sequentially introduced to a liquid feed passage to which high-temperature, high-pressure water is being fed.
[0107]Embodiments A and B also include embodiments in which the hexagonal ferrite precursor is prepared in a continuous manufacturing process.
[0108]The above embodiments will be described with reference to the figures. However, the present invention is not limited to the embodiments shown in the figures.
[0109]FIGS. 1 to 4 are schematic descriptive diagrams of manufacturing devices that can be used to manufacture ferromagnetic hexagonal ferrite powder by continuous hydrothermal synthesis processes.
[0110]More specifically, FIG. 1 is a schematic descriptive diagram of an example of a manufacturing device that is suited to Embodiment A, and FIG. 2 is a schematic descriptive drawing of an example of a manufacturing device that is suited to Embodiment B.
[0111]FIG. 3 is a schematic descriptive dia...
examples
[0153]The present invention will be described in greater detail below through Examples. However, the present invention is not limited to the embodiments shown in Examples. The “parts” and “%” indicated below denote “weight parts” and “weight %,” respectively. Unless specifically stated otherwise, the steps and evaluations set forth below were conducted in air at 23° C.±1° C. As needed, dispersions obtained by redispersion in toluene were employed in the evaluations.
[0154]In the X-ray diffraction analysis set forth below, CuKα radiation was scanned under conditions of 45 kV and 40 mA and an XRD (X-ray diffraction) pattern was measured. The X-ray diffraction analysis spectra were measured under the following test conditions:
[0155]PANalytical X'Pert Pro diffractometer, PIXcel detectors
[0156]Voltage 45 kV, intensity 40 mA
[0157]Soller slits of incident beam and diffraction beam: 0.017 radians
[0158]Fixed angle of dispersion slit: ¼ degree
[0159]Mask: 10 mm
[0160]Scattering prevention slit: ...
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Abstract
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