Iron‐rich phases in yttrium iron garnet specimens are easily detected by microscopic examination. These phases form as pockets in the yttrium iron garnet matrix at low sintering temperatures but are swept into grain boundaries at higher temperatures. The dependence of ferrimagnetic resonance line width on composition and sintering conditions is given. Low line widths are realized when gas‐generation problems are controlled. Line widths as low as 15 oersteds have been obtained.
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UITERT et al. (1959) studied this question.
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