PTC inoreva chiitiko che thermistor kana zvinhu zvine kuwedzera kwakanyanya mukupokana uye yakanaka tembiricha coefficient pane imwe tembiricha, iyo inogona kushandiswa zvakanyanya seyagara tembiricha sensor. Izvo zvinhu muviri wakasimwa une BaTiO3, SrTiO3 kana PbTiO3 sechinhu chikuru, umo madiki maokisi akadai seNb, Ta, Bi, Sb, y, La uye mamwe maokisi anowedzerwa kudzora atomic valence kuti iite. semiconducting. Iyi semiconducting barium titanate uye zvimwe zvinhu zvinowanzonzi semiconducting (yakawanda) porcelain; panguva imwecheteyo, ma oxides emanganese, iron, mhangura, chromium uye zvimwe zvinowedzera zvinowedzera kuwedzera tembiricha coefficient yekupikisa kwakanaka.
PTC inoreva chiitiko che thermistor kana zvinhu zvine kuwedzera kwakanyanya mukupokana uye yakanaka tembiricha coefficient pane imwe tembiricha, iyo inogona kushandiswa zvakanyanya seyagara tembiricha sensor. Izvo zvinhu muviri wakasimwa une BaTiO3, SrTiO3 kana PbTiO3 sechinhu chikuru, umo madiki maokisi akadai seNb, Ta, Bi, Sb, y, La uye mamwe maokisi anowedzerwa kudzora atomic valence kuti iite. semiconducting. Iyi semiconducting barium titanate uye zvimwe zvinhu zvinowanzonzi semiconducting (yakawanda) porcelain; panguva imwecheteyo, ma oxides emanganese, iron, mhangura, chromium uye zvimwe zvinowedzera zvinowedzera kuwedzera tembiricha coefficient yekupikisa kwakanaka. Platinum titanate uye mhinduro yayo yakasimba ndeye semiconductorized neyakajairika ceramic molding uye yakakwirira-tembiricha sintering kuti iwane thermistor zvinhu zvine hunhu hwakanaka. Tembiricha yaro coefficient uye Curie point tembiricha inosiyana nekuumbwa uye sintering mamiriro (kunyanya kutonhora tembiricha).
Barium titanate makristasi ndeye perovskite chimiro. Iyo ferroelectric zvinhu, uye yakachena barium titanate chinhu chinodzivirira. Mushure mekuwedzera kwekutsvaga zvisingawanzo zvinhu zvepasi kune barium titanate uye kwakakodzera kupisa kurapwa, iyo resistivity inowedzera zvakanyanya neakawanda maodha ehukuru hwakatenderedza tembiricha yeCurie, zvichikonzera kuita kwePTC, inoenderana neferroelectricity ye barium titanate makristasi uye zvinhu zviri pa. tembiricha yeCurie. shanduko yechikamu chiri pedyo. Barium titanate semiconductor ceramics zvinhu zvepolycrystalline zvine kupindirana pakati pezviyo. Kana iyo semiconductor ceramic inosvika kune imwe tembiricha kana voltage, muganho wezviyo unoshanduka, zvichikonzera shanduko yakasimba mukupikisa.
Iyo PTC mhedzisiro yebarium titanate semiconductor ceramics inobva kumiganhu yezviyo (zviyo miganhu). Pakuitisa maerekitironi, chinongedzo chiri pakati pezvikamu chinoshanda sechipinganidzo chinogona kuitika. Kana tembiricha yakadzikira, nekuda kwekuita kwemunda wemagetsi mu barium titanate, maerekitironi anogona kupfuura nepamungaite chipingamupinyi, saka kukosha kwekupikisa kudiki. Kana tembiricha yasimudzwa pedyo netembiricha yeCurie point (kureva tembiricha yakaoma), nzvimbo yemagetsi yemukati inoparadzwa, izvo zvisingagoni kubatsira kuitisa maerekitironi kuti ayambuke chingangovhariridza. Izvi zvakaenzana nekuwedzera kwechipingamupinyi chinogona kuitika uye kuwedzera kamwe kamwe mukupikisa, zvichiita kuti PTC iite. Mhando dzemuviri dzePTC mhedzisiro yebarium titanate semiconductor ceramics dzinosanganisira iyo Haiwang surface barrier model, barium vacancy model uye superposition barrier model yaDaniels et al. Vaita tsananguro ine musoro yePTC mhedzisiro kubva kwakasiyana maficha.
Nguva yekutumira: Mar-09-2022
