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The International Centre for Diffraction Data (ICDD) maintains a database of powder diffraction patterns, the Powder Diffraction File (PDF), including the d-spacings (related to angle of diffraction) and relative intensities of observable diffraction peaks. Patterns may be experimentally determined, or computed based on crystal structure and Bragg's law. It is most often used to identify substances based on x-ray diffraction data, and is designed for use with a diffractometer. The PDF contains more than a million unique material data sets. Each data set contains diffraction, crystallographic and bibliographic data, as well as experimental, instrument and sampling conditions, and select physical properties in a common standardized format.

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  • International Centre for Diffraction Data (en)
  • 国際回折データセンター (ja)
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  • 国際回折データセンター(International Centre for Diffraction Data, ICDD)は、粉末の回折データの収集や公開などを目的とした非営利組織。回折などに関わる教育や啓蒙活動も行っており、研究者や学生に対する賞の授与やX線回折のワークショップなども定期的に行っている。本部はアメリカ合衆国のペンシルバニア州、フィラデルフィアの近郊に位置するニュータウンスクエア。およそ300人の科学者がボランティアで参加しており、その他数十人の職員が本部において有給で勤務している。ICDDが作成したデータベースは有料で配布されており、その利用料収入によってICDDの運営費の多くがまかなわれている。 (ja)
  • The International Centre for Diffraction Data (ICDD) maintains a database of powder diffraction patterns, the Powder Diffraction File (PDF), including the d-spacings (related to angle of diffraction) and relative intensities of observable diffraction peaks. Patterns may be experimentally determined, or computed based on crystal structure and Bragg's law. It is most often used to identify substances based on x-ray diffraction data, and is designed for use with a diffractometer. The PDF contains more than a million unique material data sets. Each data set contains diffraction, crystallographic and bibliographic data, as well as experimental, instrument and sampling conditions, and select physical properties in a common standardized format. (en)
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  • The International Centre for Diffraction Data (ICDD) maintains a database of powder diffraction patterns, the Powder Diffraction File (PDF), including the d-spacings (related to angle of diffraction) and relative intensities of observable diffraction peaks. Patterns may be experimentally determined, or computed based on crystal structure and Bragg's law. It is most often used to identify substances based on x-ray diffraction data, and is designed for use with a diffractometer. The PDF contains more than a million unique material data sets. Each data set contains diffraction, crystallographic and bibliographic data, as well as experimental, instrument and sampling conditions, and select physical properties in a common standardized format. The organization was founded in 1941 as the Joint Committee on Powder Diffraction Standards (JCPDS). In 1978, the name of the organization was changed to the current name to highlight the global commitment of this scientific endeavor. The ICDD is a nonprofit scientific organization working in the field of X-ray analysis and materials characterization. The ICDD produces materials databases, characterization tools, and educational materials, as well as organizing and supporting global workshops, clinics and conferences. Products and services of the ICDD include the paid subscription based Powder Diffraction File databases (PDF-2, PDF-4+, PDF-4+/Web , PDF-4/Minerals, PDF-4/Organics, PDF-4/Axiom, and ICDD Server Edition), educational workshops, clinics, and symposia. The ICDD is a sponsor of the Denver X-ray Conference (DXC) and the Pharmaceutical Powder X-ray Diffraction Symposium (PPXRD). The ICDD also publishes the journals Advances in X-ray Analysis and Powder Diffraction. In 2019, Materials Data, also known as MDI, merged with ICDD. Materials Data creates JADE software used to collect, analyze, and simulate XRD data and solve issues in an array of materials science projects. In 2020, the ICDD and the Cambridge Crystallographic Data Centre (CCDC) announced a data partnership. The CCDC curates and maintains the Cambridge Structural Database (CSD). (en)
  • 国際回折データセンター(International Centre for Diffraction Data, ICDD)は、粉末の回折データの収集や公開などを目的とした非営利組織。回折などに関わる教育や啓蒙活動も行っており、研究者や学生に対する賞の授与やX線回折のワークショップなども定期的に行っている。本部はアメリカ合衆国のペンシルバニア州、フィラデルフィアの近郊に位置するニュータウンスクエア。およそ300人の科学者がボランティアで参加しており、その他数十人の職員が本部において有給で勤務している。ICDDが作成したデータベースは有料で配布されており、その利用料収入によってICDDの運営費の多くがまかなわれている。 (ja)
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