Absorption Corrections of Powder Diffraction Intensities Recorded in Transmission Geometry

Pitschke, W.; Collazo, J. A.; Hermann, H.; Hildenbrand, V. D.

doi:10.1107/s002188989600595x

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…The peak shape parameters were constrained to be the same for the six patterns during refinement. Sample absorption was fitted using the Pitschke model − for surface roughness in the TOPAS software package.…”

Section: Experimental Methodsmentioning

confidence: 99%

A Polar Corundum Oxide Displaying Weak Ferromagnetism at Room Temperature

Adem

McMitchell

et al. 2012

J. Am. Chem. Soc.

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Combining long-range magnetic order with polarity in the same structure is a prerequisite for the design of (magnetoelectric) multiferroic materials. There are now several demonstrated strategies to achieve this goal, but retaining magnetic order above room temperature remains a difficult target. Iron oxides in the +3 oxidation state have high magnetic ordering temperatures due to the size of the coupled moments. Here we prepare and characterize ScFeO3 (SFO), which under pressure and in strain-stabilized thin films adopts a polar variant of the corundum structure, one of the archetypal binary oxide structures. Polar corundum ScFeO3 has a weak ferromagnetic ground state below 356 K—this is in contrast to the purely antiferromagnetic ground state adopted by the well-studied ferroelectric BiFeO3.

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Section: Experimental Methodsmentioning

confidence: 99%

A Polar Corundum Oxide Displaying Weak Ferromagnetism at Room Temperature

Adem

McMitchell

et al. 2012

J. Am. Chem. Soc.

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“…Another important effect in the phase quantification, as it causes reduction in the intensity of the peaks, is related to the linear absorption coefficient and to the mean size of the particles [6][7][8][9].…”

Section: Research Articlementioning

confidence: 99%

Multivariate calibration by partial least squares for the quantitative phase analysis using Rietveld method

Oliveira

Epprecht

Ziolli

et al. 2008

Journal of Chemometrics

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The present work used multivariate calibration by Partial Least Squares (PLS) to produce a Net Analyte Signal as a way of establishing the independent influence of each phase in the Quantitative Phase Analysis with the Rietveld method for three sources of potential error: preferred orientation, linear absorption and counting statistics. Ternary mixtures of Al 2 O 3 , MgO and NiO were employed and organized in three groups with different degrees of variation in the weight fractions of the three constituents. An analysis of variance indicated that the partial selectivity of the least variation group differed significantly from the other groups. As for the phases, MgO partial selectivity was significantly different. This is due to a strong correlation between the linear absorption and counting statistics in the region of the (2 0 0) reflection of the MgO phase that is strongly affected by preferred orientation and also corresponds to the strongest reflection for MgO as well as for NiO. On the whole, by using matrices of similarity, a great similarity was observed between the nominal weight fractions of the phases and the weight fractions observed by means of the Rietveld method. However, such similarity diminishes as the weight fractions of the phases of the mixture become closer to each other and, in the group of mixtures with least variation of weight fractions, the method is unable to quantify the small differences between the phases, even if these errors may be considered small relative to the weight fractions themselves.

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He¹

2009

Two‐Dimensional X‐Ray Diffraction

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Absorption Corrections of Powder Diffraction Intensities Recorded in Transmission Geometry

Cited by 5 publications

References 11 publications

A Polar Corundum Oxide Displaying Weak Ferromagnetism at Room Temperature

A Polar Corundum Oxide Displaying Weak Ferromagnetism at Room Temperature

Multivariate calibration by partial least squares for the quantitative phase analysis using Rietveld method

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