Studia Geophysica et Geodaetica

, Volume 16, Issue 2, pp 167–176 | Cite as

On the magnetic phases of natural pyrrhotites

  • Karel Zapletal
  • F. Janák


The magnetic phases of natural pyrrhotites were studied by the method of powder patterns, the chemism of the magnetic phases by means of the electron microprobe method, and the crystal phases by etching the polished sections. The method of powder patterns distinguished the ferrimagnetic and antiferromagnetic phases in the transition-type pyrrhotites. The method of absorbed electrons lead to the discovery that both phases have a different chemical composition and that the ferrimagnetic phase has a lower denisty and an average atomic number. The linear and point-by-point analysis disclosed that the ferrimagnetic phase has a lower weight content of Fe and a higher weight content of S than the antiferromagnetic phase. Both the magnetic phases displayed different properties when etched, and therefore they not only have a different chemical composition, but also a different crystal structure. The necessity of studying the image of the absorbed electrons and the image of the etched surface of the polycrystalline samples of pyrrhotites of the transition type separately on individual grains was pointed out.


Crystal Structure High Weight Atomic Number Structural Geology Lower Weight 
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  1. [1]
    H. Haraldsen: Eine thermomagnetischen Untersuchung des Umwandlungen im Troilit-Pyrrhotin-Gebiet des Eisen-Schwefel-Systems. Z. Anorg. Allg. Chem., 231 (1937), 78.Google Scholar
  2. [2]
    H. Haraldsen: Über die Hochtemperaturumwandlungen der Eisen-Sulphidmischkristalle. Z. Anorg. Allg. Chem., 246 (1941), 195.Google Scholar
  3. [3]
    F. K. Lotgering: On the Ferrimagnetism of some Sulphides and Oxides. Philips Res. Rep., 11 (1956), 190.Google Scholar
  4. [4]
    G. Hägg, I. Sucksdorff: Die Kristallstruktur von Troilite und Magnetkies. Z. Phys. Chem., 22 (1933), 444.Google Scholar
  5. [5]
    F. Bertuat: Contribution à l'étude des structures lacunaires: la pyrrhotite. Acta Crys., 6 (1953), 557.Google Scholar
  6. [6]
    L. Néel: Some New Results on Antiferromagnetism and Ferromagnetism. Rev. Mod. Phys., 25 (1953), 58.Google Scholar
  7. [7]
    A. Byström: Monoclinic Magnetic Pyrites. Arkiv Kemi. Mineral. Geol., 19 (1945), 1.Google Scholar
  8. [8]
    F. Grønvold, H. Haraldsen: On the Phase Relations of Syntetic and Natural Pyrrhotites Fe1−xS. Acta Chem. Scand., 6 (1952), 1452.Google Scholar
  9. [9]
    G. Pehrman: Über den Magnetismus einiger Magnetkiese. Acta Acad. Math. Phys., 19 (1954), 3.Google Scholar
  10. [10]
    R. G. Arnold, L. E. Reichen: Measurement of the Metal Content of Naturally Occuring, Metal-Deficient, Hexagonal Pyrrhotite by an X-Ray Spacing Method. Am. Mineral., 47 (1962), 105.Google Scholar
  11. [11]
    R. H. Carpenter, G. A. Desborough: Range in Solid Solution and Structure of Natural Occuring Troilite and Pyrrhotite. Am. Mineral., 49 (1964), 1350.Google Scholar
  12. [12]
    G. A. Desborough, R. H. Carpenter: Phase Relations of Pyrrhotite. Econ. Geol., 60 (1965), 1431.Google Scholar
  13. [13]
    R. G. Arnold: Mixtures of Hexagonal and Monoclinic Pyrrhotite and the Measurement of the Metal Content of Pyrrhotite by X-Ray Difraction. Am. Mineral., 51 (1966), 1221.Google Scholar
  14. [14]
    М. А. Грабовский, О. Н. жерденко, Ю. П. Сковородкин: О возможности применения метода магнитных порощков при исследовании пирротиновых руд. Изв. АН СССР, сер. геофиз., (1961), 737.Google Scholar
  15. [15]
    М. А. Грабовский, О. Н. Жерденко: Доменная структура пирротинов различного генезиса. Геол. руд. мест., 6 (1964), 90.Google Scholar
  16. [16]
    М. А. Грабовский, О. Н. Жерденко: Сдвоенные доменные структуры некоторых пирротинов. Настоящее и прощлое магнитного поля земли. Наука, М. 1965, 110.Google Scholar
  17. [17]
    E. J. Schwarz: Magnetic Phases in Natural Pyrrhotite Fe0,89 S and Fe0,91 S. J. Geomag. Geoel., 20 (1968), 67.Google Scholar
  18. [18]
    Г. Н. Ронами, И. Д. Ветощкин: Определение химического состава промежуточного пирротина методом локального рентгеноспектрал ьного анализа. Магнетизм горных пород и палеомагнетизм 1968 г. Сборник реферат. статей, ИФЗ АN СССР, М. 1969, 175.Google Scholar
  19. [19]
    K. Zapletal: Souvislost některých magnetických vlastností s fázovým složením, doménovou strukturou a chemismem přírodních pyrrhotinů. Ph. D. Thesis, Geophys. Inst., Czechosl. Acad. Sci., Prague, March 1970 (not published).Google Scholar
  20. [20]
    K. Zapletal: Connecntion of Some Magnetic Properties with the Phase Composition of Natural Pyrrhotites. Studia geoph. et geod., 13 (1969), 191.Google Scholar
  21. [21]
    R. Carey, E. D. Isaac: Magnetic Domains. The English Univ. Press Lim., London 1966.Google Scholar
  22. [22]
    W. C. Elmore: The Magnetisation of Ferromagnetic Colloids. Phys. Rev., 54 (1938), 1092.Google Scholar
  23. [23]
    L. S. Birks: Electron Probe Microanalysis. Interscience, New York 1963.Google Scholar
  24. [24]
    K. Keil: The Electron Microprobe X-Ray Analyzer and its Application in Mineralogy. Fortsch. Mineral., 44 (1967) 4.Google Scholar
  25. [25]
    G. D. Archard: Back Scattering of Electrons. J. Appl. Phys., 32 (1961), 1505.Google Scholar

Copyright information

© ACADEMIA, Publishing House of the Czechoslovak Academy of Sciences 1972

Authors and Affiliations

  • Karel Zapletal
    • 1
  • F. Janák
  1. 1.Geophysical InstituteCzechosl. Acad. Sci.Prague

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