Abstract
AC susceptibility measurements as a function of field amplitude H ac and of frequency show a strong field dependence for a set of synthetic titanomagnetites (Fe 3− x Ti x O 4) and for certain basalts from the SOH-1 Hawaiian drill hole and from Iceland. In-phase susceptibility is constant below fields of about 10–100 A/m, and then increases by as much as a factor of two as H ac is increased to 2000 A/m. Both the initial field-independent susceptibilities and the field-dependence of susceptibility are systematically related to composition: initial susceptibility is 3 SI for a single-crystal sphere of TM0 ( x=0) and decreases with increasing titanium content; field-dependence is nearly zero for TM0 and increases systematically to a maximum near TM60 ( x=0.6). This field dependence can in some cases be mistaken for frequency dependence, and lead to incorrect interpretations of magnetic grain size and composition when titanomagnetite is present.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.