Ferroelectric cov ntaub ntawv-piv txwv li, barium titanate (BaTiO 3) thiab Rochelle ntsev -yog cov muaju uas muaj cov qauv tsim. yog me me hluav taws xob dipoles; uas yog, nyob rau hauv txhua chav tsev qhov chaw ntawm tus nqi zoo thiab tus nqi tsis zoo raug cais me ntsis.
Cov ntaub ntawv twg hauv qab no nthuav tawm ferro hluav taws xob?
Kev piav qhia: Thaum lub dielectric nthuav tawm hluav taws xob polarization txawm tias tsis muaj qhov chaw sab nraud, nws yog lub npe hu ua ferro-electricity thiab cov ntaub ntawv no yog hu ua Ferro-electrics. Lawv yog cov anisotropic crystals uas nthuav tawm spontaneous polarisation. Li no xwb Rochelle ntsev nthuav tawm Ferro-hluav taws xob.
Puas platinum nthuav tawm ferroelectricity?
7.7.
Los ntawm kev sib piv nrog ferromagnetic nco, ferroelectric cov ntaub ntawv raug tshawb xyuas rau cov khoom tsis muaj hluav taws xob (nanocapacitor arrays). Siv cov qauv nanoporous, ferroelectric ceramic (piv txwv li lead zirconate titanate) tuaj yeem tso ua nanoscale Islands tuaj ntawm cov hlau tsim nyog (xws li platinum).
Dab tsi ua rau ferroelectricity?
Peb tam sim no paub tias lub hauv paus chiv keeb ntawm ferroelectric theem hloov hauv oxides yog vim lub hauv paus anharmonic tej zaum qhov chaw uas yog tshwm sim los ntawm softening ntawm lub luv luv repulsions los ntawm covalent hybridization yog li tias cov atoms tuaj yeem txav tawm ntawm qhov nruab nrab thiab ntawm ib leeg.
Dab tsi yog cov yam ntxwv tseem ceeb ntawmCov ntaub ntawv ferroelectric?
Ferroelectric cov ntaub ntawv muaj cov yam ntxwv hauv qab no:
(i) Lawv muaj lub siab dielectric qhov tsis tu ncua uas tsis yog-linear, piv txwv li, nws nyob ntawm qhov ntau. ntawm qhov kev siv zog ntawm qhov hluav taws xob. (ii) Lawv nthuav tawm hysteresis loops, piv txwv li, lub polarization tsis yog linear ua haujlwm ntawm daim ntawv thov hluav taws xob.
