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Barium ferrite

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801:(MP) have been used to store data on tapes and magnetic strips but they have reached their limit for high capacity data storage. In order to increase their capacity by (25×) on data tape the MP had to increase the tape length by (45%) and track density by over (500%) which made it necessary to reduce the size of the individual particles. As the particles were reduced in size, the passivizing coating needed to prevent the oxidation and deterioration of the MP had to become thicker. This presented a problem for as the passivation coating got thicker it became harder to achieve an acceptable signal to noise ratio. 777:
characteristic of barium ferrite makes it a popular choice in motor and generator designs and also in loudspeaker applications. Ferrite magnets can be used in temperatures up to 300 °C, which makes it a perfect to be used in the applications mentioned above. Ferrite magnets are extremely good insulators and don't allow any electrical current to flow through them and they are brittle which shows their ceramic characteristics. Ferrite magnets also have good machining properties, which allows for the material to be cut in many shapes and sizes.
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Developments in the field have also resulted in the reduction of the size of BaFe particles to about 20 nm. This contrasts with MP technology, which has problems shrinking the particles past 100 nm. Barium ferrite has better packing properties than most other metal particles because of the
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oxide materials to yield the coercivity values necessary to record. In recent decades, barium ferrite has replaced acicular oxides; without any dopants, the acicular oxides produce very low coercivity values, making the material very magnetically soft, while barium ferrite's higher coercivity levels
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Barium ferrite is used in applications such as recording media, permanent magnets, and magnetic stripe cards (credit cards, hotel keys, ID cards). Due to the stability of the material, it is able to be greatly reduced in size, making the packing density much greater. Earlier media devices utilized
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Barium ferrite completely out classes MP, mostly because Ba‑Fe is already in its oxidized state and so is not restricted in its size by a protective coating. Also due to its hexagonal pattern it is easier to organize compared to the unorganized rod like MP. Another factor is the difference in the
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When barium ferrite magnets increase in temperature, their high intrinsic coercivity improves, this is what makes it more resistant to thermal demagnetization. Ferrite magnets are the only type of magnets that become substantially more resistant to demagnetization as temperature increases. This
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Barium ferrite has been considered for long term data storage. The material has proven to be resistant to a number of different environmental stresses, including humidity and corrosion. Because ferrites are already oxidized it can not be oxidized any further. This is one reason ferrites are so
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that are generally stable to moisture and corrosion-resistant. Ba‑Fe ferrite is an oxide, so it does not break down due to oxidation as much as a metal alloy might; giving Ba‑Fe a much greater life expectancy.
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Watson, Mark L.; Beard, Robert A.; Kientz, Steven M.; Feebeck, Timothy W. (2008). "Investigation of Thermal Demagnetization Effects in Data Recorded on Advanced Barium Ferrite Recording Media".
859:(LTO) tape storage media. Because of its high density, barium ferrite has led to data capacity improvements in both enterprise and LTO tapes over prior metal particle (MP) media technology. 1471: 805:
size of the particles, in MP the size ranges from 40 to 100 nm while the Ba‑Fe is only 20 nm. So the smallest MP particle is still double the size of the BaFe particles.
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resistant to corrosion. Barium ferrite also proved to be resistant to thermal demagnetization, another issue common with long-term storage. The
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Barium ferrite is a common material for speaker magnets. The materials can be formed into almost any shape and size using a process called
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Okazaki, Chisato; Mori, Saburo; Kanamaru, Fumikazu (1961). "Magnetic and crystallographical properties of hexagonal barium mono-ferrite,
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distinctive shape of the particles. This leads to better control over magnetic orientation and improved signal-to-noise characteristics.
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Cao, H.B.; Zhao, Z.Y.; Lee, M.; Choi, E.S.; McGuire, M.A.; Sales, B.C.; Zhou, H.D.; Yan, J.-Q.; Mandrus, D.G. (1 June 2015).
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ID cards using barium ferrite are made with a magnetic fingerprint that identifies them, allowing readers to self-calibrate.
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The compound occurs in nature, although is exceedingly rare. It is called barioferrite and is related to pyrometamorphism.
1464:"FujiFilm barium-ferrite magnetic tape establishes world record in data density: 29.5 billion bits per square inch" 1400: 1256: 1223: 189: 327: 1539: 1088:
Rowley, S.E.; Chai, Yi-Sheng; Shen, Shi-Peng; Sun, Young; Jones, A.T.; Watts, B.E.; Scott, J.F. (17 May 2016).
938:"High pressure floating zone growth and structural properties of ferrimagnetic quantum paraelectric BaFe12O19" 898: 132: 95: 1987: 153: 2003: 1215: 893: 2039: 2013: 1532: 519:
coupled. This area of technology is usually considered to be an application of the related fields of
894:"Hexagonal ferrites: A review of the synthesis, properties and applications of hexaferrite ceramics" 827:
make the material magnetically hard and thus a superior choice for recording material applications.
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with a hydroxide to chloride concentration ratio of 2:1. Nano-particles are prepared from
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A one-step hydrothermal process can be used to form crystals of barium ferrite, by mixing
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A related family of industrially useful "hexagonal ferrites" are known, also containing
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framework of oxides. Furthermore, some of the oxygen centers are replaced by
486: 297: 88: 1392: 1843: 1807: 1248: 1139: 644: 409: 1493: 1314: 262: 1113: 1013: 972: 937: 1210:. In Khan, Sher Bahadar; Asiri, Abdullah M.; Akhtar, Kalsoom (eds.). 844: 1153:
Goto, Yasumasa; Takada, Toshio (1960). "Phase diagram of the system
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Except where otherwise noted, data are given for materials in their
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coupled, and one unit cell of BaM has a net magnetic moment of 40
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Barium ferrite is used for enterprise level and commodity
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Guillissen, Joseph; van Rysselberghe, Pierre J. (1931).
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Barium Ferrite is used in tape drives and floppy disks.
1448:. Data storage. Fujifilm Technologies. United States: 699: 931: 929: 1274: 1039: 1037: 1035: 1033: 1031: 718: 1087: 926: 2031: 120: 1028: 52: 1212:Nanomaterials and their Fascinating Attributes 935: 1540: 481:, has a high packing density, and is a metal 302:1,316 °C (2,401 °F; 1,589 K) 1547: 1533: 1152: 850: 173: 98: 1245:Magnetic Materials and Their Applications 1129: 971: 953: 553:ions. Formulas for these species include 140: 887: 885: 883: 812: 793: 773:is typically around 450 °C (723K). 1419:. Magnaworks Technology. Archived from 1270: 1268: 169: 2032: 891: 780: 222:O=O=O.O=O=O.O=O=O.O=O=O.O=O=O.O=O=O.O= 89: 1528: 1382: 1241:"Ceramic magnet materials (ferrites)" 1205: 997:"Studies on zinc and barium ferrites" 880: 866: 492: 201:Key: AJCDFVKYMIUXCR-UHFFFAOYSA-N 1554: 1329:"Characteristics of ferrite magnets" 1265: 1238: 1385:"Card-based identification systems" 830: 538:structure, these materials feature 111: 13: 1193:10.1111/j.1151-2916.1960.tb14330.x 838: 14: 2056: 1470:. 22 January 2010. Archived from 1417:"Hard ferrite (ceramic) magnets" 345:, abbreviated BaFe, BaM, is the 31:Barium ferrite crystal structure 24: 1504: 1486: 1456: 1409: 1376: 1346: 1321: 808: 324:(at 25 °C , 100 kPa). 1232: 1199: 1146: 1081: 988: 252: 243: 1: 912:10.1016/j.pmatsci.2012.04.001 899:Progress in Materials Science 874: 763: 719:{\displaystyle {\ce {->}}} 404:materials are components in 246: 7: 785:Barium ferrites are robust 534:. In contrast to the usual 477:Barium ferrite is a highly 10: 2061: 1446:"Barium ferrite: Overview" 1354:"Barium ferrite: Overview" 1216:Bentham Science Publishers 1206:Niazi, Shahida B. (2016). 892:Pullar, Robert C. (2012). 1562: 1389:Electronic Access Control 1067:10.1109/TMAG.2008.2001591 318: 230: 210: 185: 36: 23: 851:Tape Data Storage Media 1383:Honey, Gerard (2000). 818: 720: 540:hexagonal close-packed 816: 794:Mechanical properties 721: 525:solid state chemistry 472:solid state chemistry 415:BaFe is described as 406:magnetic stripe cards 1251:. pp. 291–294. 1218:. pp. 181–238. 1002:J. Electrochem. Soc. 697: 400:). This and related 198:InChI=1S/Ba.12Fe.19O 1315:10.1143/JPSJ.16.119 1239:Heck, Carl (1974). 1106:2016NatSR...625724R 1059:2008ITM....44.3568W 964:2015APLM....3f2512C 781:Chemical properties 712: 639:, barium chloride, 515:configuration, are 309:Solubility in water 274: g·mol 20: 1516:ima-mineralogy.org 1512:"List of Minerals" 1474:on 19 October 2020 1423:on 20 October 2018 1395:. pp. 47–55. 1303:J. Phys. Soc. Jpn. 1181:J. Am. Ceram. Soc. 1094:Scientific Reports 867:Natural occurrence 819: 716: 493:Chemical structure 328:Infobox references 18: 2027: 2026: 1466:(Press release). 1364:on 13 August 2017 1114:10.1038/srep25724 1053:(11): 3568–3571. 1047:IEEE Trans. Magn. 1014:10.1149/1.3497845 973:10.1063/1.4922934 771:Curie temperature 713: 710: 629:potassium nitrate 521:materials science 517:ferrimagnetically 479:magnetic material 468:materials science 457:ferrimagnetically 347:chemical compound 336:Chemical compound 334: 333: 154:CompTox Dashboard 78:Interactive image 2052: 2040:Barium compounds 2019: 2009: 1556:Barium compounds 1549: 1542: 1535: 1526: 1525: 1520: 1519: 1518:. 21 March 2011. 1508: 1502: 1501: 1490: 1484: 1483: 1481: 1479: 1460: 1454: 1453: 1442: 1433: 1432: 1430: 1428: 1413: 1407: 1406: 1380: 1374: 1373: 1371: 1369: 1360:. 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686: 685: 684: 680: 677: 676: 675: 673: 666: 663: 662: 661: 659: 652:iron(III) oxide 621:barium chloride 612: 609: 608: 607: 603: 600: 599: 598: 596: 591: 588: 587: 586: 582: 579: 578: 577: 575: 570: 567: 566: 565: 561: 558: 557: 556: 554: 549: 547: 546: 545: 543: 504: 502: 501: 500: 498: 495: 465: 460: 451: 449: 448: 447: 445: 440: 437: 436: 435: 431: 428: 427: 426: 422: 420: 419: 418: 416: 395: 392: 391: 390: 386: 383: 382: 381: 379: 375: 374: 369: 366: 365: 364: 360: 357: 356: 355: 353: 337: 330: 325: 311: 269: 267: 257: 251: 240: 226: 223: 218: 217: 206: 203: 202: 199: 193: 192: 181: 163: 156: 147: 127: 114: 83: 70: 59: 46: 32: 29: 19:Barium ferrite 12: 11: 5: 2058: 2048: 2047: 2042: 2025: 2024: 2022: 2021: 2016: 2011: 2006: 2001: 1997: 1993: 1989: 1985: 1981: 1977: 1973: 1969: 1965: 1960: 1956: 1952: 1948: 1944: 1940: 1936: 1932: 1928: 1924: 1920: 1916: 1912: 1908: 1904: 1900: 1896: 1892: 1888: 1884: 1879: 1874: 1870: 1866: 1862: 1858: 1854: 1850: 1846: 1841: 1837: 1833: 1829: 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Index


CAS Number
12047-11-9
JSmol
Interactive image
ECHA InfoCard
100.031.782
Edit this at Wikidata
PubChem
16217742
UNII
4HT629NL8B
CompTox Dashboard
DTXSID20923429
Edit this at Wikidata
InChI
SMILES
Chemical formula
Molar mass
Density
Melting point
Solubility in water
standard state
Infobox references
ferrite
chemical compound
formula
ferrite
magnetic stripe cards
loudspeaker

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