labarai

PTC yana nufin wani abu na thermistor ko abu tare da ƙaƙƙarfan haɓaka juriya da ingantaccen yanayin zafin jiki a wani zazzabi, wanda za'a iya amfani dashi musamman azaman firikwensin zafin jiki akai-akai. Kayan abu shine jiki mai tsauri tare da BaTiO3, SrTiO3 ko PbTiO3 a matsayin babban sashi, wanda aka ƙara ƙaramin adadin oxides kamar Nb, Ta, Bi, Sb, y, La da sauran oxides don sarrafa valence atomic don yin shi. semiconducting. Wannan barium titanate na semiconducting da sauran kayan galibi ana kiransu da sinadarai na semiconducting (girma); a lokaci guda, oxides na manganese, baƙin ƙarfe, jan karfe, chromium da sauran abubuwan da ake ƙarawa ana ƙara su don ƙara yawan ƙimar zafin jiki na ingantaccen juriya.

PTC yana nufin wani abu na thermistor ko abu tare da ƙaƙƙarfan haɓaka juriya da ingantaccen yanayin zafin jiki a wani zazzabi, wanda za'a iya amfani dashi musamman azaman firikwensin zafin jiki akai-akai. Kayan abu shine jiki mai tsauri tare da BaTiO3, SrTiO3 ko PbTiO3 a matsayin babban sashi, wanda aka ƙara ƙaramin adadin oxides kamar Nb, Ta, Bi, Sb, y, La da sauran oxides don sarrafa valence atomic don yin shi. semiconducting. Wannan barium titanate na semiconducting da sauran kayan galibi ana kiransu da sinadarai na semiconducting (girma); a lokaci guda, oxides na manganese, baƙin ƙarfe, jan karfe, chromium da sauran abubuwan da ake ƙarawa ana ƙara su don ƙara yawan ƙimar zafin jiki na ingantaccen juriya. Platinum titanate da ingantaccen bayani an daidaita shi ta hanyar gyare-gyaren yumbura na yau da kullun da zafin jiki mai zafi don samun kayan thermistor tare da kyawawan halaye. Matsakaicin yanayin zafinta da yanayin yanayin Curie sun bambanta tare da abun da ke ciki da yanayin ɓacin rai (musamman yanayin sanyi).
Barium titanate lu'ulu'u na cikin tsarin perovskite. Abu ne na ferroelectric, kuma tsarkakakken barium titanate abu ne mai rufewa. Bayan Bugu da kari na gano rare ƙasa abubuwa zuwa barium titanate da kuma dace zafi magani, da resistivity karuwa sharply da dama umarni na girma a kusa da Curie zafin jiki, sakamakon PTC sakamako, wanda shi ne daidai da ferroelectricity na barium titanate lu'ulu'u da kayan a zafin jiki na Curie. canjin lokaci na kusa. Barium titanate semiconductor ceramics kayan polycrystalline ne tare da musaya tsakanin hatsi. Lokacin da yumbu na semiconductor ya kai wani zazzabi ko ƙarfin lantarki, iyakar hatsi ta canza, yana haifar da canji mai kaifi a cikin juriya.
Tasirin PTC na barium titanate semiconductor ceramics ya fito ne daga iyakokin hatsi (iyakar hatsi). Don gudanar da na'urorin lantarki, mu'amala tsakanin barbashi yana aiki azaman shamaki mai yuwuwa. Lokacin da zafin jiki ya yi ƙasa, saboda aikin filin lantarki a cikin barium titanate, electrons na iya shiga cikin sauƙi ta hanyar shinge mai yuwuwa, don haka ƙimar juriya kadan ne. Lokacin da aka ɗaga zafin jiki kusa da ma'aunin zafi na Curie (watau zafin jiki mai mahimmanci), filin lantarki na ciki ya lalace, wanda ba zai iya taimakawa wajen gudanar da electrons don ketare yuwuwar shingen. Wannan yana daidai da haɓaka mai yuwuwar shamaki da haɓakar juriya kwatsam, yana haifar da tasirin PTC. Samfuran jiki na tasirin PTC na barium titanate semiconductor ceramics sun haɗa da samfurin shingen saman Haiwang, samfurin vacancy na barium da samfurin shingen babban matsayi na Daniels et al. Sun yi bayani mai ma'ana don tasirin PTC daga bangarori daban-daban.