Cov kws tshawb fawb tau Magnetic Nanopowder rau 6G Technology
Newswise - Cov kws tshawb fawb txog cov khoom siv tau tsim ib txoj hauv kev sai rau kev tsim cov epsilon hlau oxide thiab pom nws cov lus cog tseg rau cov khoom siv sib txuas lus txuas ntxiv mus. Nws cov khoom sib nqus zoo heev ua rau nws yog ib qho ntawm cov khoom nyiam tshaj plaws, xws li rau 6G tiam tom ntej ntawm kev sib txuas lus thiab rau cov ntaub ntawv sib nqus. Cov haujlwm no tau luam tawm hauv Phau Ntawv Xov Xwm ntawm Cov Khoom Siv Chemistry C, phau ntawv xov xwm ntawm Royal Society of Chemistry. Hlau oxide (III) yog ib qho ntawm cov oxides thoob plaws ntiaj teb. Nws yog feem ntau pom raws li cov ntxhia hematite (los yog alpha hlau oxide, α-Fe2O3). Lwm qhov ruaj khov thiab kev hloov kho ntau yam yog maghemite (lossis gamma hloov kho, γ-Fe2O3). Lub qub yog dav siv nyob rau hauv kev lag luam raws li ib tug liab pigment, thiab lub tom kawg yog ib tug sib nqus kaw nruab nrab. Ob qhov kev hloov kho txawv tsis yog hauv cov qauv crystalline (alpha-hlau oxide muaj hexagonal syngony thiab gamma-hlau oxide muaj cubic syngony) tab sis kuj muaj cov khoom sib nqus. Ntxiv rau cov ntaub ntawv no ntawm cov hlau oxide (III), muaj ntau qhov kev hloov pauv txawv xws li epsilon-, beta-, zeta-, thiab txawm tias iav. Lub sijhawm txaus nyiam tshaj plaws yog epsilon hlau oxide, ε-Fe2O3. Qhov kev hloov kho no muaj kev quab yuam siab heev (lub peev xwm ntawm cov khoom siv los tiv thaiv sab nraud magnetic teb). Lub zog nce mus txog 20 kOe ntawm chav tsev kub, uas yog piv rau qhov tsis sib xws ntawm cov hlau nplaum raws li cov khoom kim heev hauv ntiaj teb. Tsis tas li ntawd, cov khoom siv absorbs electromagnetic hluav taws xob nyob rau hauv sub-terahertz zaus ntau (100-300 GHz) los ntawm cov nyhuv ntawm ntuj ferromagnetic resonance.Qhov zaus ntawm xws li resonance yog ib qho ntawm cov txheej txheem rau kev siv cov khoom siv hauv kev sib txuas lus wireless - 4G. tus qauv siv megahertz thiab 5G siv kaum tawm gigahertz. Muaj cov phiaj xwm siv sub-terahertz ntau yam ua haujlwm ua haujlwm nyob rau hauv lub thib rau tiam (6G) wireless technology, uas tau npaj rau kev taw qhia nquag hauv peb lub neej txij li thaum ntxov 2030s. Cov khoom tsim tau tsim nyog rau kev tsim cov hloov pauv lossis cov khoom siv hluav taws xob ntawm cov zaus no. Piv txwv li, los ntawm kev siv cov khoom sib xyaw ε-Fe2O3 nanopowders nws yuav ua tau los ua cov xim uas nqus hluav taws xob nthwv dej thiab yog li tiv thaiv chav los ntawm cov teeb liab extraneous, thiab tiv thaiv cov teeb liab los ntawm kev cuam tshuam los ntawm sab nraud. Lub ε-Fe2O3 nws tus kheej kuj tuaj yeem siv rau hauv 6G txais khoom siv. Epsilon hlau oxide yog ib qho tsis tshua muaj thiab nyuaj ntawm cov hlau oxide kom tau txais. Niaj hnub no, nws yog tsim nyob rau hauv ntau me me, nrog rau cov txheej txheem nws tus kheej siv mus txog rau ib lub hlis. Qhov no, tau kawg, txwv tsis pub nws daim ntawv thov dav dav. Cov kws sau ntawv ntawm txoj kev tshawb fawb tau tsim ib txoj hauv kev rau kev ua kom nrawm nrawm ntawm epsilon hlau oxide muaj peev xwm txo tau cov synthesis lub sij hawm mus rau ib hnub (uas yog, ua kom tiav tag nrho lub voj voog ntawm ntau dua 30 lub sij hawm sai dua!) thiab nce qhov ntau ntawm cov khoom tshwm sim. . Cov txheej txheem yog yooj yim rau reproduce, pheej yig thiab yuav siv tau yooj yim nyob rau hauv kev lag luam, thiab cov ntaub ntawv uas yuav tsum tau rau lub synthesis - hlau thiab silicon - yog ib tug ntawm cov feem ntau cov khoom nyob rau hauv lub ntiaj teb no. "Txawm hais tias epsilon-hlau oxide theem tau txais nyob rau hauv daim ntawv ntshiab kuj ntev dhau los, nyob rau hauv 2004, nws tseem tsis tau pom muaj daim ntawv thov kev lag luam vim qhov nyuaj ntawm nws cov synthesis, piv txwv li raws li ib tug nruab nrab rau magnetic - kaw. Peb tau tswj hwm kom yooj yim rau kev siv thev naus laus zis, "hais tias Evgeny Gorbachev, tus tub ntxhais kawm PhD hauv Department of Materials Sciences ntawm Moscow State University thiab thawj tus sau ua haujlwm. Tus yuam sij rau kev ua tiav ntawm kev siv cov ntaub ntawv nrog cov ntaub ntawv sau tseg yog kev tshawb fawb rau hauv lawv lub cev tseem ceeb. Yog tsis muaj kev kawm tob, cov ntaub ntawv yuav raug tsis nco qab lawm ntau xyoo, raws li tau tshwm sim ntau tshaj ib zaug hauv keeb kwm ntawm kev tshawb fawb. Nws yog tandem ntawm cov kws tshawb fawb ntawm cov ntaub ntawv tshawb fawb ntawm Moscow State University, uas ua ke cov compound, thiab physicists ntawm MIPT, uas kawm nws nyob rau hauv kom meej, uas ua rau txoj kev loj hlob zoo.
Lub sij hawm xa tuaj: Plaub Hlis-04-2022 