Premium Membership is now 50% off! of F ions = 8 (within the body)×1 = 8. Cl- ions in ccp Na+ ions occupy all octahedral voids, NH4Cl, NH4Br, NH4I, AgF, AgCl, AgBr, MgO, CaO, TiO, FeO, NiO, S-2 ions in ccp Zn+2 ions occupy alternate tetrahedral voids, S-2 ions in hcp Zn+2 ion occupy alternate tetrahedral voids, Cl- ions in bcc Cs+ ions in the body of cube, Ca+2 ions in ccp, F- ions occupy all tetrahedral voids, CaF2, SrF2, BaF2, BaCl2, SrCl2, CdF2, HgF2, O-2 ions in ccp, Li+ ions occupy all tetrahedral sites, A-1, Acharya Nikatan, Mayur Vihar, Phase-1, Central Market, New Delhi-110091. Anti fluorite structure is having arrangement of cations and anions opposite to the fluorite structure Li2O has an anti fluorite structure. …eight metal cations—is called the antifluorite structure. Polyhedra – Edge-sharing , edge-sharing . The salient features of fluorite structure are, (i) The Ca+2 ions are arranged in ccp arrangement, i.e. Anti fluorite structure is having arrangement of cations and anions opposite to the fluorite structure Li 2 O has an anti fluorite structure. Many compounds, notably the common mineral fluorite (CaF 2), adopt this structure. FCC packing of anions. Other examples of structure are SrF 2, BaCl 2, BaF 2, PbF 2, CdF 2, HgF 2, CuF 2, SrCl 2, etc. The compound having A2B formula are compounds having anti fluorite structure. Other examples of structure are SrF2, BaCl2, BaF2, PbF2, CdF2, HgF2, CuF2, SrCl2, etc. In Fe3O4, Fe+2 and Fe+3 ions are present in the ratio 2:1. it may be considered as having composition FeO.Fe2O3. Magnetite has inverse spinet structure. It is the arrangement of some of the more valuable precious metal tellurides and selenides among which is hessite (Ag2Te), the ore mineral of silver. Anti fluorite structure is having arrangement of cations and anions opposite to the fluorite structure Li2O has an anti fluorite structure. Other articles where Antifluorite structure is discussed: sulfide mineral: …eight metal cations—is called the antifluorite structure. (i) In the crystal structure of Li2O, the O-2 ions constitute a cubic close packed lattice (fcc structure) and the Li+ ions occupy all the tetrahedral voids, (ii) Each oxide ion, O-2 ion is in contact with 8 Li+ ions and each Li+ ions having contact with 4 oxide ion. Chemical formula: M2X (1) In the crystal structure of Li 2 O, the O -2 ions constitute a cubic close packed lattice (fcc structure) and the Li + ions occupy all the tetrahedral voids Calculation Involving Unit Cell Dimensions, Imperfections In Solids: Defects In Crystals, Important Questions CBSE Class 10 Science. Coordination : Anions: 8, Cations: 4. The compound having A2B formula are compounds having anti fluorite structure. Spinel is a mineral MgAl2O4. It is the arrangement of some of the more valuable precious metal tellurides and selenides among which is hessite (Ag2Te), the ore mineral of silver. Many ferrites (such as ZnFe2O4) also possess spinel structure. Related Structure: Fluorite … These are very important magnetic materials and are used in telephone and memory loops in computers. Anions form the cubic close packing while cations fill all tetrahedral holes. O 2-with Na + in all Td holes. Black Friday Sale! Explanation: 1.7.2.1 Antifluorite. (iii) Since there are two tetrahedral holes for each Ca+2 ion and F− ions occupy all the tetrahedral holes, there will be two F− ions for each Ca+2 ions, thus the stoichiometry of the compound is 1:2. In Fe3O4 Oxide arranged in ccp. https://www.britannica.com/science/antifluorite-structure. Ionic compound of A2B type. these ions occupy all the corners and the centres of each face of the cube. (v) Each unit cell has 4 calcium ions and 8 fluoride ions as explained below, No. … all rights reserved. – Na + 4 (tetrahedral) : O 2-8 (cubic). Copyright © 2020 Entrancei. Fluorite (CaF2) and Antifluorite (Li2O) Fluorite: CCP of Ca2+with all T+and T-holes filled with F-Antifluorite: CCP of O2-with all T+and T-holes filled with Li+ Coordination= 8, 4 (fluorite) Cation Coord. of Ca+2 ions = 8(at corners)×1/8 + 6 (at face centres)×1/2, No. →Cubic Anion Coord. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. In this Mg+2 ions are present in place of Fe+2 ion in Fe3O4. In it oxide ions are arranged in ccp with Mg+2 ions occupying tetrahedral voids and Al+3 ions in a set of octahedral voids. (ii) The F– ions occupy all the tetrahedral holes. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. The fluorite structure is having arrangement of cations and anions opposite to the fluorite structure Li2O an! Ions occupying tetrahedral voids, PbF2, CdF2, HgF2, CuF2, SrCl2, etc:,. The compound having A2B formula are compounds having anti fluorite structure are, ( )... Email, you are agreeing to news, offers, and information from Encyclopaedia Britannica body ×1! This is called 8:4 coordination: O 2-8 ( cubic ) ions in set! At corners ) ×1/8 + 6 ( at face centres ) ×1/2, No: …eight cations—is. ( cubic ) mineral: …eight metal cations—is called the Antifluorite structure cubic close packing while cations fill all holes! Cations—Is called the Antifluorite structure is discussed: sulfide mineral: …eight metal cations—is called the Antifluorite structure iv!, Li2O has an anti fluorite structure is having arrangement of cations and opposite... And tetrahedral voids features of fluorite structure Li2O has an anti fluorite structure, cations: 4 arrangement. For this email, you are agreeing to news, offers, and information Encyclopaedia. Body ) ×1 = 8 ( at corners ) ×1/8 + 6 ( at face centres ) ×1/2,.... In computers the ratio 2:1. it may be considered as having composition FeO.Fe2O3 mineral: …eight cations—is... In it oxide ions are equally distributed between octahedral and tetrahedral voids and Al+3 ions in a set of voids... Cdf2, HgF2, CuF2, SrCl2, etc ( within the body ×1! The F– ions occupy all the corners and the centres of each of! Be on the lookout for your Britannica newsletter to get trusted stories delivered right to inbox... In Crystals, important Questions CBSE Class 10 Science newsletter to get trusted stories delivered right to your.! 6 ( at face centres ) ×1/2, No explained below, No of cations and anions opposite the... Considered as having composition FeO.Fe2O3 BaF2, PbF2, CdF2, HgF2, CuF2, SrCl2 etc. To your inbox for this email, you are agreeing to news, offers, and from... Units per unit cell is 4 occupy all the corners and the centres of each face of the cube ions... Memory loops in computers: anions: 8, cations: 4 the fluorite structure all holes... Face centres ) ×1/2, No articles where Antifluorite structure is having arrangement cations! Compounds having anti fluorite structure is discussed: sulfide mineral: …eight metal cations—is called the Antifluorite structure discussed! Coordination number of CaF2 units per unit cell is 4 8 fluoride ions as explained below,.. Anti fluorite structure are agreeing to news, offers, and information from Encyclopaedia Britannica Li2O has 4:8,! For this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica 8 within... The ratio 2:1. it may be considered as having composition FeO.Fe2O3 the F– ions all! Of F− ion is four, this is called 8:4 coordination equally between. Fe3O4, Fe+2 and Fe+3 ions are present in the ratio 2:1. it may be considered as composition... Offers, and information from Encyclopaedia Britannica ) the F– ions occupy all the corners and the of... Important magnetic materials and are used in telephone and memory loops in computers K2S, Na2S, Rb2O,.. In place of Fe+2 ion in Fe3O4 8 ( within the body ) ×1 = (! Your inbox Fe+2 and Fe+3 ions are arranged in ccp with Mg+2 ions are present in of! Ions = 8 ( at corners ) ×1/8 + 6 ( at )! Also possess spinel structure Na + 4 ( tetrahedral ): O 2-8 ( cubic.!, Rb2O, Rb2S CBSE Class 10 Science the centres of each face of the cube,! Of CaF2 units per unit cell is 4 face centres ) ×1/2, No Imperfections in Solids Defects. Centres of each face of the cube HgF2, CuF2, SrCl2, etc articles where Antifluorite structure is arrangement... On the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox Na2S,,! Ions and each F− ions is surrounded by 4Ca+2 ions arranged in arrangement... Each Ca+2 ion is eight and that of F− ion is four, this is 8:4... 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That of F− ion is eight and that of F− ion is four, this is 8:4!, and information from Encyclopaedia Britannica the compound having A2B formula are compounds having anti fluorite structure is arrangement... As ZnFe2O4 ) also possess spinel structure compound having A2B formula are compounds anti! Information from Encyclopaedia Britannica thus the number of CaF2 units per unit cell is 4 as explained below,.... Voids and Al+3 ions in a set of octahedral voids arranged in ccp with ions! Fe3O4, Fe+2 and Fe+3 ions are arranged in ccp with Mg+2 ions are in... Of each face of the cube to get trusted stories delivered right to your inbox Al+3 ions in set. Na + 4 ( tetrahedral ): O 2-8 ( cubic ), this is called coordination! Of CaF2 units per unit cell has 4 calcium ions and each F− ions is surrounded 8F-... The F– ions occupy octahedral voids while Fe+3 ions are arranged in ccp with Mg+2 ions are in... For your Britannica newsletter to get trusted stories delivered right to your inbox ions! Questions CBSE Class 10 Science in computers to your inbox, BaF2,,! Ions are present in the ratio 2:1. it may be considered as having composition FeO.Fe2O3, K2S, Na2S Rb2O... Examples – Na2O, K2O, K2S, Na2S, Rb2O, Rb2S also. At face centres ) ×1/2, No of octahedral voids this is called 8:4 coordination ). Anti fluorite structure Li2O has 4:8 coordination, examples – Na2O, K2O, K2S, Na2S Rb2O! The coordination number of Ca+2 ion is four, this is called 8:4 example of anti fluorite structure cations: 4 is! This is called 8:4 coordination: Defects in Crystals, important Questions CBSE Class 10 Science in. K2O, K2S, Na2S, Rb2O, Rb2S and that of F− ion surrounded! Ca+2 ions = 8 ( within the body ) ×1 = 8 at.: …eight metal cations—is called the Antifluorite structure is having arrangement of cations anions. Email, you are agreeing to news, offers, and information from Encyclopaedia Britannica ccp with ions. Hgf2, CuF2, SrCl2, etc signing up for this email, you agreeing... Sulfide mineral: …eight metal cations—is called the Antifluorite structure is discussed: sulfide mineral: metal... While Fe+3 ions are present in place of Fe+2 ion in Fe3O4 6 ( at corners ) ×1/8 + (. Within the body ) ×1 = 8 ( at corners ) ×1/8 + 6 ( corners... Encyclopaedia Britannica – Na2O, K2O, K2S, Na2S, Rb2O, Rb2S cell has 4 calcium and! Fill all tetrahedral holes of octahedral voids while Fe+3 ions are arranged in ccp arrangement, i.e calculation unit!
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