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Related Concept Videos

Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

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Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
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Atomic Absorption Spectroscopy: Overview01:27

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Atomic absorption spectroscopy (AAS) is a technique used to analyze elements by measuring electromagnetic radiation (EMR) absorbed by atoms, which causes them to transition to a higher-energy orbit. The most crucial step in AAS is atomization, where the analyte is converted into gas-phase atoms, typically through a flame or furnace. Some of these atoms become thermally excited in the flame, while most remain in the ground state.
When irradiated by EMR of a particular wavelength, these...
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Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

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An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
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Atomic Absorption Spectroscopy: Lab01:21

Atomic Absorption Spectroscopy: Lab

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For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
 Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing...
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Molecular Spectroscopy: Absorption and Emission01:14

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Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels.  Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
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Atomic Spectroscopy: Absorption, Emission, and Fluorescence01:23

Atomic Spectroscopy: Absorption, Emission, and Fluorescence

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Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...
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Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering
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Strontium hexaferrite platelets: a comprehensive soft X-ray absorption and Mössbauer spectroscopy study.

G D Soria1, P Jenus2, J F Marco3

  • 1Instituto de Quimica Física "Rocasolano", CSIC, Madrid, E-28006, Spain. gdelgadosoria@iqfr.csic.es.

Scientific Reports
|August 15, 2019
PubMed
Summary
This summary is machine-generated.

Synthesized strontium hexaferrite (SrFe12O19) platelets exhibit unique magnetic properties and structural differences compared to bulk material. These nanostructures show potential for advanced magnetic applications due to their distinct iron site contributions and domain structures.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Magnetism

Background:

  • Strontium hexaferrite (SrFe12O19) is a well-known magnetic material.
  • Controlling the morphology and properties of SrFe12O19 at the nanoscale is crucial for advanced applications.

Purpose of the Study:

  • To synthesize and characterize strontium hexaferrite (SFO) platelets using a hydrothermal method.
  • To investigate the structural and magnetic properties of SFO platelets and compare them with commercial SFO powders.

Main Methods:

  • Hydrothermal synthesis
  • Mössbauer spectroscopy
  • X-ray absorption spectroscopy and microscopy (Fe-L and O-K edges)
  • Density functional theory (DFT) calculations
  • Micromagnetic simulations

Main Results:

  • Successfully synthesized SFO platelets with dimensions up to several micrometers in width and tens of nanometers in thickness.
  • Mössbauer spectra indicated a greater contribution of iron tetrahedral sites in platelets compared to bulk material.
  • Observed out-of-plane magnetic domains with narrow 180° domain walls (<20 nm).

Conclusions:

  • The hydrothermal method yields SFO platelets with distinct structural and magnetic characteristics.
  • The observed properties suggest potential for SFO nanostructures in specialized magnetic applications.
  • DFT calculations accurately reproduced experimental O-K edge spectra, validating the structural model.