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Mpms xl 7t

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The MPMS XL-7T is a magnetic property measurement system designed to characterize the magnetic properties of materials. It features a superconducting magnet capable of producing a magnetic field up to 7 Tesla. The system is equipped with a temperature control unit that allows for measurements over a wide temperature range.

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MPMS-XL (77 citations) MPMS-7T (9 citations)

4 protocols using mpms xl 7t

1

Purification of Fe-N-C Catalysts

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Previous works[55, 56, 57] demonstrated that when Fe–N–C catalysts are exposed to air, the adsorption of O2 molecules on the Fe center may change the oxidation state of Fe center and cause the distortion of FeN4 moiety. In order to avoid such interference, Fe–N–C catalysts investigated were purified by H2 and Ar to remove the adsorbed O2, confirmed by X‐band electron paramagnetic resonance characterization (Figure S27, Supporting Information). The molar magnetic susceptibility (χm) was measured from 2 to 300 K for pristine Fe–N–C and Fe–N–C/XO2 with a Superconducting Quantum Interference Device (SQUID) (MPMS XL‐7T, Quantum Design) at a magnetic field of 5000 Oe with a high vacuum of 5 × 10−5 torr.
Wang R., Zhang L., Shan J., Yang Y., Lee J., Chen T., Mao J., Zhao Y., Yang L., Hu Z, & Ling T. (2022). Tuning Fe Spin Moment in Fe–N–C Catalysts to Climb the Activity Volcano via a Local Geometric Distortion Strategy. Advanced Science, 9(31), 2203917.
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2

Magnetic Susceptibility of Co0.5 and N-C

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The molar magnetic susceptibility χm was measured from 2 to 300 K for Co0.5 and N–C with a Superconducting QUantum Interference Device (SQUID) (MPMS XL-7T, Quantum Design) at a magnetic field of 5,000 Oe. A mass of 16 mg of Co0.5 or N–C was weighed and introduced in a polymer straw. The average effective magnetic moment of cobalt atoms (µeff) was then obtained by fitting the plot of 1/χm (in mol of cobalt atoms per emu) vs. 1/T with a linear law in the region 15–77 K. The value for the slope obtained is defined as a 1/Cm. From the Cm-value, the average effective magnetic moment of cobalt atoms (µeff) is directly calculated via the relation µeff = 2.82·Cm1/2, in units of Bohr magneton (µB). The average spin of cobalt ions is then obtained via µS = g·µB·sqrt(s(s + 1)), where g is equal to 2.002 and s is the average spin density for all cobalt moieties present in Co0.5.
Zitolo A., Ranjbar-Sahraie N., Mineva T., Li J., Jia Q., Stamatin S., Harrington G.F., Lyth S.M., Krtil P., Mukerjee S., Fonda E, & Jaouen F. (2017). Identification of catalytic sites in cobalt-nitrogen-carbon materials for the oxygen reduction reaction. Nature Communications, 8, 957.
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3

Magnetic Properties of Mn2V2O7 and MnV2O6

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Magnetic properties of Mn2V2O7 and MnV2O6 were measured with a superconducting quantum interference device magnetometer (MPMS XL-7T, Quantum Design). The magnetic hysteresis loop measurements were recorded at room temperature in fields between −30,000 and +30,000 Oe.
Li J., Zheng C., Zhao E., Mao J., Cheng Y., Liu H., Hu Z, & Ling T. (2023). Ferromagnetic ordering correlated strong metal–oxygen hybridization for superior oxygen reduction reaction activity. Proceedings of the National Academy of Sciences of the United States of America, 120(43), e2307901120.
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4

Magnetic Susceptibility of Diradical and Monoradical Compounds

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Magnetic susceptibility of polycrystalline
samples of diradicals 1 and monoradicals 2 was measured in a polycarbonate capsule fitted in a plastic straw
as a function of temperature in cooling (300 K → 2 K) and then
in heating (2 K → 400 K) modes with 0.2 K increments in a range
of 2 to 10 K, 1 K increments in the range of 11 to 49 K, and 5 K increments
in the range of 50 to 300 K) at 0.60 T, using a SQUID magnetometer
(Quantum Design MPMS-XL-7T). No significant differences in magnetic
susceptibility were observed for data collected in heating and cooling
modes. Analysis was conducted for data obtained on the first heating
run. Details of data collection, processing, and analysis are provided
in the Supporting Information.
Bodzioch A., Obijalska E., Jakubowski R., Celeda M., Gardias A., Trzybiński D., Tokarz P., Szczytko J., Woźniak K, & Kaszyński P. (2024). Electronic and Magnetic Interactions in 6-Oxoverdazyl Diradicals: Connection through N(1) vs C(3) Revisited. The Journal of Organic Chemistry, 89(9), 6306-6321.
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