T
Thelma S. Berquó
Researcher at Concordia College
Publications - 46
Citations - 3596
Thelma S. Berquó is an academic researcher from Concordia College. The author has contributed to research in topics: Ferrihydrite & Superparamagnetism. The author has an hindex of 25, co-authored 46 publications receiving 3180 citations. Previous affiliations of Thelma S. Berquó include University of Minnesota & University of São Paulo.
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Static and dynamic magnetic properties of spherical magnetite nanoparticles
TL;DR: In this paper, a detailed study of static and dynamic magnetic behavior of Fe3O4 nanoparticles with average particle sizes ranging from 5 to 150 nm is presented, and the existence of surface spin disorder can be inferred from the decrease of saturation magnetization MS at low temperatures, as the average particle size is reduced.
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Iron partitioning and hydrogen generation during serpentinization of abyssal peridotites from 15°N on the Mid-Atlantic Ridge
Frieder Klein,Wolfgang Bach,Niels Jöns,Thomas M. McCollom,Bruce M. Moskowitz,Thelma S. Berquó +5 more
TL;DR: In this article, detailed petrographic, mineral chemical, magnetic and Mosbauer analyses of partially to fully serpentinized peridotites from the Ocean Drilling Program (ODP) Leg 209, Mid-Atlantic Ridge (MAR) 15°N area are presented.
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Magnetite in seafloor serpentinite—Some like it hot
Frieder Klein,Wolfgang Bach,Susan E. Humphris,Wolf-Achim Kahl,Niels Jöns,Bruce M. Moskowitz,Thelma S. Berquó +6 more
TL;DR: The mechanisms that control hydrogen generation and magnetite formation during serpentinization of mantle peridotite remain poorly understood as discussed by the authors, however, some completely serpentinized peridots have as much as 6.15 wt% magnetite, whereas others are nearly magnetite free.
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Molecule Derived Synthesis of Nanocrystalline YFeO3 and Investigations on Its Weak Ferromagnetic Behavior
Sanjay Mathur,Michael Veith,Rasa Rapalaviciute,Hao Shen,Gerardo F. Goya,and Waldir L. Martins Filho,Thelma S. Berquó +6 more
TL;DR: In this paper, a new Y−Fe alkoxide, [YFe(OPri)6(PriOH)]2, is used in the sol−gel process to obtain the orthoferrite, YFeO3.
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Morin transition in hematite: Size dependence and thermal hysteresis
TL;DR: In this paper, the temperature of the Morin transition from saturation remanence warming curves was determined to be 250-261 K for 0.5-6 mm hematite natural single crystals, 257-260 K for 45-600 μm sieved crystal fractions, and 241-256 K for submicron synthetic hematites with grain sizes between 120 and 520 nm.