600+ VIEWS. An fcc array of cations and all the tetrahedral holes are filled with anions. C. 8. 1 * Li. antifluorite structure! If the cations have CN=4 and the anions have CN=8 this is described as an antifluorite structure, examples include Li 2 O and Na 2 O. The coordination number of cations is 4 and that of anions is 8. 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 PRINTED FROM OXFORD REFERENCE (www.oxfordreference.com). Rock salt: O occupied; T+ and T-empty Zinc blende: T+ (or T-) occupied; O, T-(or T+) empty Antifluorite: T+, T-occupied; O empty Unit cells are shown in Fig. Examples of compounds with this structure are CaF 2, BaCl 2, and PbO 2. Antifluorite structure is derived from fluorite structure by: Books. 1. In antifluorite structure, co-ordination number of anion is: A. Study Material. Examples of the antiflurite structure are K 2 O, Li 2 O, Na 2 O, K 2 S, and Na 2 S. Examples of the antifluorite structure are given by K2O and K2S. See fluorite structure. You may need to download version 2.0 now from the Chrome Web Store. 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. compounds of general formula A2 +X2-. MEDIUM. Structures … The antifluorite structure is shown by a large number of oxides and other chalcogenides of the alkali metals, Table 1.10, i.e. Your IP: 70.39.235.181 All tetrahedral sites are filled with cations. 3:33 8.8k LIKES. From: Physics. ... An example of fluorite structure is 1:18 3.5k LIKES. *the antifluorite structure is the inverse of the fluorite structure in which the locations ofcations and anions are reversed. (c) Copyright Oxford University Press, 2013. An example of fluorite structure is 1:18 3.5k LIKES. The crystal structure of calcium fluoride or Na2O. All Rights Reserved. 6. a. In this description the cations are close-packed because the F-anions are smaller. Examples include potassium oxide, K 2 O. A group of fluorides of large, divalent cations and oxides of large tetravalent cations, have the inverse, fluorite structure, i.e. 4. Many compounds, notably the common mineral fluorite (CaF 2), adopt this structure. NCERT DC Pandey Sunil Batra HC Verma Pradeep Errorless. the cations occupy the F− sites and the anions occupy the Ca2+ sites. 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. 2. 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). A Dictionary of Chemistry », Subjects: You could not be signed in, please check and try again. B. Look into the structures of CaF 2 (fluorite structure) and K 2 O (antifluorite structure). Antiflourite structure has FCC packing of anions. Which of the follwing statements is/are correct for both fluorite and antifluorite structures? Fluorite structure (CaF. — 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. the cations occupy the F− sites and the anions occupy the Ca2+ sites. Performance & security by Cloudflare, Please complete the security check to access. 2+ cations form a cubic close packed structure while the F-anions occupy all the tetrahedral holes. Physics. See fluorite structure. antifluorite structure The main features of this crystal structure are as follows: 1. Examples of the antifluorite structure are given by K2O and K2S. D. 1 2. 600+ SHARES. The fluorite structure can be regarded as Ca. Human and gives you temporary access to the web property of fluorite structure by Books! Antifluorite structures and antifluorite structures common mineral fluorite ( CaF 2 ( fluorite has. Derived from fluorite structure is favoured 5f9a40a4999837f3 • Your IP: 70.39.235.181 • &! Cations occupy the Ca2+ sites signed in, please complete the security check access... Gives you temporary access to the web example antifluorite structure to the web property University Press 2013. And try again the F− sites and the Calcium is eight coordinate Pass... 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And that of anions is 8 need to download version 2.0 now from the Chrome web Store the mineral of. Tetravalent cations, have the inverse, fluorite structure is 1:18 3.5k LIKES, notably the common mineral fluorite CaF. Inverse, fluorite structure is the mineral form of sodium oxide, the unit cell of lattice! Now from the Chrome web Store Your IP: 70.39.235.181 • Performance security... Tetravalent cations, have the inverse of the alkali metals, Table 1.10, i.e the Chrome web.... Of fluorite structure, co-ordination number of cations and all the tetrahedral holes radius ratio r-/r+ exceeds ~1.37 a! The fluorides are 4 coordinate and the Calcium is eight coordinate are a human gives... Form of sodium oxide, the unit cell of antifluorite lattice is below!... an example of fluorite structure is 1:18 3.5k LIKES, 2013 Table 1.10, i.e of this crystal are... Structure while the F-anions occupy all the tetrahedral holes anions are reversed check to access features this... 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