Chemical and Structural Classifications
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1 Chemical and Structural Classifications
2 What? Materials can be classified by their chemistry and structure. There are three main types of structural classifications: 1. Prototype Structure Structure prototyping is a well known concept in inorganic chemistry where, often, a large number of compounds crystallize with very similar atomic arrangements. 2. Mineral Classification Based on the crystal chemistry characteristics and used to assist in the identification of mineral phases 3. Zeolite Classification Based on the zeolite name and framework type code (FTC)
3 Prototype Structures ICDD Traditional Prototype Structure Notation Based on the unit cell, axial ratios, Pearson Symbol and chemistry (usually assigned semi automatically by comparing crystal chemistry and diffraction patterns) ANX Formula Based on the type of ion and its site occupation Example : Ca Ti O3 is of ABX3 type Fe3O4 is of AB2X4 type LPF Prototype Structure Based on the method proposed by Parthe of comparing the standardized crystal structures of isopointal groups. (Acta Cryst. (1984) A40, ) Example: Cu3 As,cI64,220 (Structure Type Formula, Pearson Symbol, Space Group Number)
4 Mineral Classification Family Related by partial structural similarities such as framework, chain, etc. Subfamily Collection within the family based on specific similarities
5 Mineral Classification Breakdown Supergroup Highest symmetry phase in which the structural arrangement remains unchanged Group Composed of isostructural phase Subgroup Groups further classified based on chemistry (oxides, sulfides) Related Structures Based on structural distortions from the group structure
6 Example Zinc Sulfide (ZnS) Information about the structure & its classification are found under the Miscellaneous tab of the PDF card window. The Pearson Symbol, Prototype Structure & Mineral Classification are all given here.
7 Zeolite Name Framework Code Zeolite Classification Based on topologically distinct tetrahedral TO 4 framework (T=Si, Al, P, Ga, B, etc.) as per "Atlas of Zeolite Framework Types", 5th edition, Ch. Baerlocher, W.M. Meier & D.H. Olson, Amsterdam: Elsevier (2001) For more information online.org
8 The possible names are found at the bottom of the PDF pane. Zeolite Names Example Aluminum Silicate
9 The Zeolite Classification is found on the Miscellaneous pane of the PDF card. Zeolite Classification Example Aluminum Silicate [Al 2 O 3 * 54SiO 2 ]
10 Why? Deriving a Starting Model for Rietveld Refinements Traditionally the starting models for Rietveld refinements were developed based on chemical/crystallographic intuition. In other words, the individual s knowledge of structure types was used. Databases with Structure Type information can make seminal contributions to this effort. The Powder Diffraction File, in particular, offers several advantages as one can perform a search match based on the user s diffraction pattern to explore possible models.
11 Why? Structural chemistry information Database search results can be sorted based on structural chemistry. Can be used to explore the database from the materials design point of view. 3D crystalline structure related properties Ferroelectric, Piezoelectric, Non Linear Optics Transport Mineral and Zeolite classifications are extremely useful as database search filters.
12 How? Prototype structure search option 1. Click on Structures tab on the main search window. 2. The LPF prototype & prototype structure selection panes are located at the bottom of the window. Push this button for a list of prototype structures.
13 How? Mineral and Zeolite classification search option 1. Click on Names tab on the main search window. 2. Choose the mineral or zeolite classification codes of interest from the menu as shown in the following slide.
14 Zeolite & Mineral Classification Menus
15 How? ANX formula search option 1. Click on Elements tab on the main search window. 2. Type in the ANX formula or select from the ANX list displayed using the lookup button.
16 Formula Type (ANX) panel The ANX list
17 Thank you for viewing our tutorial. Additional tutorials are available at the ICDD website ( International Centre for Diffraction Data 12 Campus Boulevard Newtown Square, PA Phone: Fax:
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