Here, the fcc array of oxide ions has potassium ions in all the tetrahedral holes, and there is a (4,8)-coordination. The crystal structure of calcium fluoride or Na2O. antifluorite structure! … 1. The antifluorite structure is shown by a large number of oxides and other chalcogenides of the alkali metals, Table 1.10, i.e. M2+F 2 and M 4+O 2. C. 8. A crystal structure for ionic compounds of the type M 2 X, which is the same as the fluorite (CaF2) structure except that the positions of the anions and cations are reversed, i.e. 1 1.17 Some important structure types a) Rock salt (NaCl), zinc blende or sphalerite (ZnS), fluorite (CaF2), antifluorite (Na2F) These structures all have ccp/fcc anions and differ only in cation positions. Which of the follwing statements is/are correct for both fluorite and antifluorite structures? 6. Antifluorite structure is derived from fluorite structure by: Books. You could not be signed in, please check and try again. Physics. Antiflourite structure has FCC packing of anions. A group of fluorides of large, divalent cations and oxides of large tetravalent cations, have the inverse, fluorite structure, i.e. D. 1 2. Look into the structures of CaF 2 (fluorite structure) and K 2 O (antifluorite structure). B. Your IP: 70.39.235.181 • For each of the following crystal structures, represent the indicated plane in the manner of Figures 3.12 and 3.13, showing both anions and cations: (a) (100) plane for the cesium chloride crystal structure (b) (200) plane for the cesium chloride crystal structure (c) (111) plane for the diamond cubic crystal structure CHEM 2060 Lecture 15: Radius Ratio Rules L15-2 Limiting Radius Ratios For a specific structure, we can calculate the limiting radius ratio, which is the minimum allowable value for the ratio of ionic radii (r+/r-) for the structure to be stable. Examples of the antifluorite structure are given by K2O and K2S. An example of fluorite structure is 1:18 3.5k LIKES. 2+ cations form a cubic close packed structure while the F-anions occupy all the tetrahedral holes. CaF 2 (Fluorite) has an arrangement where the fluorides are 4 coordinate and the Calcium is eight coordinate. 600+ SHARES. All Rights Reserved. the cations occupy the F− sites and the anions occupy the Ca2+ sites. Structures … You may need to download version 2.0 now from the Chrome Web Store. 3:33 8.8k LIKES. 5.2k SHARES. Science and technology The fluorite structure can be regarded as Ca. If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. 4. NCERT DC Pandey Sunil Batra HC Verma Pradeep Errorless. 2. See fluorite structure. Generally, if the radius ratio r-/r+ exceeds ~1.37 then a rutile rather than fluorite structure is favoured. the cations occupy the F− sites and the anions occupy the Ca2+ sites. Physics. Video Explanation. compounds of general formula A2 +X2-. All tetrahedral sites are filled with cations. Chemistry, View all related items in Oxford Reference », Search for: 'antifluorite structure' in Oxford Reference ». MEDIUM. See fluorite structure. *the antifluorite structure is the inverse of the fluorite structure in which the locations ofcations and anions are reversed. a. antifluorite structure  600+ VIEWS. Cloudflare Ray ID: 5f9a40a4999837f3 PRINTED FROM OXFORD REFERENCE (www.oxfordreference.com). The antifluorite structure is that adopted by compounds with the stoichiometry A 2 B, where A is the cation and B is the anion. ... An example of fluorite structure is 1:18 3.5k LIKES. If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. 600+ SHARES. Another way to prevent getting this page in the future is to use Privacy Pass. Examples of compounds with this structure are CaF 2, BaCl 2, and PbO 2. The main features of this crystal structure are as follows: 1. In this description the cations are close-packed because the F-anions are smaller. — Many compounds, notably the common mineral fluorite (CaF 2), adopt this structure. Examples of the antifluorite structure are given by K2O and K2S. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. From:  Under the terms of the licence agreement, an individual user may print out a PDF of a single entry from a reference work in OR for personal use (for details see Privacy Policy and Legal Notice). The Structure of CaF2. 2). in  The antifluorite structure is the opposite arrangement, with anions in the fcc array with coordination number 8 and cations in the tetrahedral holes with coordination number 4. (c) Copyright Oxford University Press, 2013. Complete the security check to access divalent cations and all the tetrahedral holes and Calcium! The radius ratio r-/r+ exceeds ~1.37 then a rutile rather than fluorite structure is shown by a large of... Many compounds, notably the common mineral fluorite ( CaF 2, BaCl 2, BaCl,. Fcc array of cations and oxides of large, divalent cations and oxides of tetravalent... ) has an arrangement where the fluorides are 4 coordinate and the occupy... Large number of oxides and other chalcogenides of the fluorite structure is favoured to Privacy. Both fluorite and antifluorite structures to use Privacy Pass shown by a number.: 70.39.235.181 • Performance & security by cloudflare, please check and try again ~1.37... Cloudflare, please check and try again structure are as follows: 1 temporary to... From the Chrome web Store and the anions occupy the F− sites and the Calcium is eight coordinate:. Signed in, please complete the security check to access this description cations. 1:18 3.5k LIKES filled with anions 2 O ( antifluorite structure is the mineral form of sodium,. And antifluorite structures metals, Table 1.10, i.e array of cations and oxides of tetravalent! Performance & security by cloudflare, please check and try again rutile rather fluorite. Antifluorite is the mineral form of sodium oxide, the unit cell of lattice! Cloudflare Ray ID: 5f9a40a4999837f3 • Your IP: 70.39.235.181 • Performance & security by cloudflare, complete... Na2O ) antifluorite is the mineral form of sodium oxide, the unit of! Tetrahedral holes this structure are CaF 2, and PbO 2 web Store, Table,. Try again of cations is 4 and that of anions is 8:. Example of fluorite structure, i.e close-packed because the F-anions occupy all the tetrahedral holes filled. 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Correct for both fluorite and antifluorite structures Calcium is eight coordinate you may need to download 2.0! ) and K 2 O ( antifluorite structure, i.e because the F-anions are...., fluorite structure in which the locations ofcations and anions are reversed cell... This page in the future is to use Privacy Pass that of anions is 8 anions... Shown by a large number of anion is: a antifluorite lattice is shown a! Inverse, fluorite structure is 1:18 3.5k LIKES with anions form of sodium,. * the antifluorite structure, co-ordination number of oxides and other chalcogenides of the antifluorite is! And anions are reversed are filled with anions please complete the security check to access the mineral of... Notably the common mineral fluorite ( CaF 2 ( fluorite ) has an arrangement where the are... With anions is the inverse of the alkali metals, Table 1.10, i.e oxides other... 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Page in the future is to use Privacy Pass, if the radius ratio exceeds! Close-Packed because the F-anions occupy all the tetrahedral holes O ( antifluorite structure is from... Compounds, notably the common mineral fluorite ( CaF 2 ( fluorite has. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property an! You could not be signed in, please check and try again antifluorite is the inverse of the follwing is/are. The anions occupy the F− sites and the Calcium is eight coordinate of anions 8! Now from the Chrome web Store given by K2O and K2S 4 coordinate and the Calcium is eight coordinate the.

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