nūhou

ʻO ka PTC e pili ana i kahi mea wela a i ʻole mea me ka piʻi ʻana o ke kūʻē a me ka coefficient wela maikaʻi i kekahi mahana, hiki ke hoʻohana kūikawā ʻia e like me ka sensor wela mau. ʻO ka mea he kino sintered me BaTiO3, SrTiO3 a i ʻole PbTiO3 ma ke ʻano he mea nui, kahi i hoʻohui ʻia ai kahi helu liʻiliʻi o nā oxides e like me Nb, Ta, Bi, Sb, y, La a me nā oxides ʻē aʻe e hoʻomalu i ka valence atomic e hana ai. semiconducting. ʻO kēia semiconducting barium titanate a me nā mea ʻē aʻe i kapa pinepine ʻia he semiconducting (bulk) porcelain; i ka manawa like, ua hoʻohui ʻia nā oxides o manganese, hao, keleawe, chromium a me nā mea hoʻohui ʻē aʻe e hoʻonui ai i ka coefficient mahana o ke kūpaʻa maikaʻi.

ʻO ka PTC e pili ana i kahi mea wela a i ʻole mea me ka piʻi ʻana o ke kūʻē a me ka coefficient wela maikaʻi i kekahi mahana, hiki ke hoʻohana kūikawā ʻia e like me ka sensor wela mau. ʻO ka mea he kino sintered me BaTiO3, SrTiO3 a i ʻole PbTiO3 ma ke ʻano he mea nui, kahi i hoʻohui ʻia ai kahi helu liʻiliʻi o nā oxides e like me Nb, Ta, Bi, Sb, y, La a me nā oxides ʻē aʻe e hoʻomalu i ka valence atomic e hana ai. semiconducting. ʻO kēia semiconducting barium titanate a me nā mea ʻē aʻe i kapa pinepine ʻia he semiconducting (bulk) porcelain; i ka manawa like, ua hoʻohui ʻia nā oxides o manganese, hao, keleawe, chromium a me nā mea hoʻohui ʻē aʻe e hoʻonui ai i ka coefficient mahana o ke kūpaʻa maikaʻi. ʻO ka Platinum titanate a me kāna hopena paʻa i semiconductorized e ka hoʻoheheʻe seramika maʻamau a me ka sintering wela kiʻekiʻe e loaʻa ai nā mea thermistor me nā ʻano maikaʻi. ʻOkoʻa kona ʻano wela a me ka mahana o ka Curie me ke ʻano o ka haku mele ʻana a me nā kūlana sintering (ʻoi aku ka mahana wela).
Aia nā kristal Barium titanate i ka hale perovskite. He mea ferroelectric ia, a ʻo ka barium titanate maʻemaʻe he mea insulating. Ma hope o ka hoʻohui ʻia ʻana o nā mea o ka honua i ka barium titanate a me ka mālama ʻana i ka wela kūpono, piʻi nui ka resistivity e nā kauoha o ka nui a puni ka mahana Curie, e hopena i kahi hopena PTC, i kūlike me ka ferroelectricity o nā kristal barium titanate a me nā mea ma. ka mahana Curie. nā hoʻololi pae kokoke. ʻO Barium titanate semiconductor ceramics nā mea polycrystalline me nā pilina ma waena o nā kīʻaha. Ke piʻi ka semiconductor ceramic i kahi mahana a i ʻole ka volta, hoʻololi ka palena o ka palaoa, e hopena i kahi loli nui o ke kū'ē.
ʻO ka hopena PTC o ka barium titanate semiconductor ceramics mai nā palena palaoa (nā palena palaoa). No ke alakaʻi ʻana i nā electrons, ʻo ka pilina ma waena o nā ʻāpana e hana i kahi pale kūpono. Ke haʻahaʻa ka mahana, ma muli o ka hana o ke kahua uila i ka barium titanate, hiki i nā electrons ke hele maʻalahi i ka pale kūpono, no laila ua liʻiliʻi ka waiwai kū'ē. Ke hoʻokiʻekiʻe ʻia ka mahana ma kahi kokoke i ka mahana o Curie (ʻo ia hoʻi ka wela koʻikoʻi), ua luku ʻia ke kahua uila i loko, ʻaʻole hiki ke kōkua i ke alakaʻi ʻana i nā electrons e ʻaʻa i ka pale hiki. Ua like kēia me ka piʻi ʻana o ka pale hiki a me ka piʻi koke ʻana o ke kū'ē, ka hopena o ka hopena PTC. ʻO nā hiʻohiʻona kino o ka hopena PTC o ka barium titanate semiconductor ceramics e pili ana i ke kumu hoʻohālike pale ʻili o Haiwang, ke kumu hoʻohālike barium a me ke kumu hoʻohālike superposition o Daniels et al. Ua hana lākou i ka wehewehe kūpono no ka hopena PTC mai nā ʻano like ʻole.