The Quantitative Analysis of Composite Materials by the RIETVELD Method with Texture Correction

Bae, Jin Ho; Heo, Gyun; Oh, Seung Taik; Shin, Eun Joo; Seong, Baek-Seok; Lee, Changhee; Oh, Kyu Hwan

doi:10.4028/www.scientific.net/msf.408-412.215

Cited by 4 publications

(5 citation statements)

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“…In a previous study, 18 we used a direct quantitative texture analysis to precisely determine the degree of orientation of ͑Bi, Pb͒ 2 Sr 2 Ca 2 Cu 3 O 10+␦ superconductor ceramics. [20][21][22][23][24] Here, we present the data obtained from x-ray characterization of several TE ceramics using the direct quantitative texture analysis and combined approach. Furthermore, for accessing to the complete texture of the material and microstructure informations ͑crystallite size͒, the recently developed combined approach has been proved to be a viable tool 19 and was successfully applied to various types of materials.…”

Section: Introductionmentioning

confidence: 99%

Quantitative texture analysis of grain-aligned [Ca2CoO3]0.62[CoO2] ceramics processed by the reactive-templated grain growth method

Guilmeau

Itahara

Tani

et al. 2005

Journal of Applied Physics

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Articles you may be interested inHigh-temperature electrical transport behaviors of the layered Ca 2 Co 2 O 5 -based ceramics Structural and transport properties of ( Bi,Pb ) 4 Sr 3 Ca 3 Cu 4−m Fe m O x (m=0-0.06) glasses: Precursors for high T c superconductors In this study, the texture analysis of highly grain-aligned ceramics of thermoelectric ͓Ca 2 CoO 3 ͔ 0.62 ͓CoO 2 ͔ prepared by the reactive-templated grain growth process was examined. The direct quantitative texture analysis and the combined approach, two advanced methods of x-ray diffraction analysis, were used to analyze fiber texture strength and crystallite size. The calculation of distribution density, correlated to the representation of normal and inverse pole figures, highlights the influence of the texture development on the thermoelectric properties. The electrical conductivity was significantly increased by the improvement of grain alignment during the final uniaxial-pressing treatment. An increase in orientation degree enhances thermoelectric properties, even for highly textured ceramics. The quantitative texture analysis appears to be essential for the development of textured thermoelectric ceramics with enhanced properties.

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Section: Introductionmentioning

confidence: 99%

Quantitative texture analysis of grain-aligned [Ca2CoO3]0.62[CoO2] ceramics processed by the reactive-templated grain growth method

Guilmeau

Itahara

Tani

et al. 2005

Journal of Applied Physics

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“…Working within the framework that combines the classical Rietveld analysis with texture and grain size analysis, as implemented in the MAUD software (materials analysis using diffraction) or GSAS (general structure analysis system), permits a comprehensive approach to the crystal structure−texture−microstructure analysis. The increasing number of papers based on this methodology illustrates the interest of many researchers in materials science for Rietveld texture analysis. − Herein, we illustrate the advantages of jointly analyzing the structure (Rietveld), texture (WIMV), and microstructure (Popa), of α-Al 2 O 3 ceramics. We use the neutron data of textured specimens synthesized with different processing parameters to illustrate the high efficiency and accuracy of the software to extract the texture and mean crystallite sizes.…”

Section: Introductionmentioning

confidence: 99%

“…The increasing number of papers based on this methodology illustrates the interest of many researchers in materials science for Rietveld texture analysis. [25][26][27][28][29][30][31][32][33] Herein, we illustrate the advantages of jointly analyzing the structure (Rietveld), texture (WIMV), and microstructure (Popa), of R-Al 2 O 3 ceramics. We use the neutron data of textured specimens synthesized with different processing parameters to illustrate the high efficiency and accuracy of the software to extract the texture and mean crystallite sizes.…”

Section: Introductionmentioning

confidence: 99%

Rietveld Texture Analysis of Alumina Ceramics by Neutron Diffraction

et al. 2004

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The orientation distributions of R-Al 2 O 3 textured ceramics are determined from neutron diffraction spectra. A curved position-sensitive detector coupled to a tilt angle (χ) scan allowed the whole diffraction pattern treatment in the combined Rietveld-WIMV-Popa algorithm. Four textured alumina ceramics were prepared by slip-casting under a high magnetic field and sintered at 800, 1300, 1400, and 1600 °C. The calculation of the distribution density, correlated to the representation of the normal and inverse pole figures, highlights the influence of the magnetic field and sintering temperature on the texture development. The principal pole figures show a pronounced (00l) texture: (001) pole parallel to the direction of slip-casting, and (110) pole with higher distribution density for the directions perpendicular to the expected fiber axis. The inverse pole figures calculated for the fiber direction show a major (001) component for all the samples. With the increasing sintering temperature, the texture strength is enhanced and the c-axis distribution is sharper. The effectiveness of the approach for determining the crystallite size is also evident. As a global trend, the calculated crystallite size and observed grain size are similar and increase with the increasing sintering temperature. The mechanism of the texture development in the sintered specimens is certainly initiated from the preferred orientation of the green body after slip-casting under a high magnetic field. The basal texture is enhanced during sintering by selective anisotropic grain growth. We evidenced here the powerfulness of the Rietveld texture analysis to provide a basis for the correlation of texture, microstructural parameters, and anisotropic properties.

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“…To overcome this problem, the combination of Rietveld (Rietveld, 1969), Williams-Imhof-Matthies-Vinel (WIMV) (Matthies & Vinel, 1982) and Popa approaches (Popa, 1998), for instance as implemented in the MAUD software (Lutterotti et al, 1999), permits a comprehensive new approach to crystal structuretexture-microstructure analysis. The increasing number of papers based on such a methodology illustrates the interest of many researchers in materials science in Rietveld texture analysis (Guilmeau, Lambert et al, 2003;Wenk et al, 2001Wenk et al, , 2003Morales et al, 2002Morales et al, , 2003Bae et al, 2002;Xie et al, 2003;Lutterotti et al, 1997;Noudem et al, 2004). Through these different studies, it has become apparent that the methodology readily handles fibre textures and is also valuable for textures exhibiting no peculiar symmetry, and really effective in the case of poly-phased materials with overlapped pole figures.…”

Section: Introductionmentioning

confidence: 99%

Rietveld texture analysis of complex oxides: examples of polyphased Bi2223 superconducting and Co349 thermoelectric textured ceramics characterization using neutron and X-ray diffraction

et al. 2005

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Orientation distributions of cobaltite thermoelectric and polyphased bismuth‐based cuprate superconducting textured materials are determined from neutron and X‐ray diffraction analysis. Curved position‐sensitive detectors coupled to a tilt‐angle (χ) scan enable the treatment of the whole diffraction pattern using the combined Rietveld–WIMV–Popa algorithm. The textures of three phases of superconducting compounds are determined. The critical current densities, measured for four samples, are strongly dependent on the calculated texture strengths, crystallite sizes and phase ratios. For the cobaltite compounds, a comparison between X‐ray and neutron analysis shows the advantages of the latter technique for avoiding the limitations of the X‐ray analysis with respect to the defocusing effect. The results highlight the necessity and efficiency of the combined approach for a quantitative texture analysis of complex materials and exemplify the texture–anisotropic physical properties relationship for a better understanding and design of improved bulk superconducting and thermoelectric materials.

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The Quantitative Analysis of Composite Materials by the RIETVELD Method with Texture Correction

Cited by 4 publications

References 0 publications

Quantitative texture analysis of grain-aligned [Ca2CoO3]0.62[CoO2] ceramics processed by the reactive-templated grain growth method

Quantitative texture analysis of grain-aligned [Ca2CoO3]0.62[CoO2] ceramics processed by the reactive-templated grain growth method

Rietveld Texture Analysis of Alumina Ceramics by Neutron Diffraction

Rietveld texture analysis of complex oxides: examples of polyphased Bi2223 superconducting and Co349 thermoelectric textured ceramics characterization using neutron and X-ray diffraction

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