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System Hematite Magnetite Siderite

What are hematite magnetite and siderite. Hematite exhibited temperaturedependent magnetic coercivity values ranging from 289 to 5027 oersteds 23–400 kAm The origin of these high coercivity values has been interpreted as a consequence of the subparticle structure induced by the different particle and crystallite size growth rates at increasing annealing temperature .

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