兵器材料科学与工程
兵器材料科學與工程
병기재료과학여공정
Ordnance Material Science and Engineering
2010年
2期
1-4
,共4页
李明利%杜丕一%纪松%钱坤明%周宇松
李明利%杜丕一%紀鬆%錢坤明%週宇鬆
리명리%두비일%기송%전곤명%주우송
钛酸锶钡%复相陶瓷%微观形貌%介电性能
鈦痠鍶鋇%複相陶瓷%微觀形貌%介電性能
태산송패%복상도자%미관형모%개전성능
strontium barium titanate%composite ceramics%microstructure%dielectric property
采用草酸盐共沉淀工艺制备高反应活性Ba_(0.6)Sr_(0.4)TiO_3(BST)粉体,添加适量的B_2O_3-SiO_2-Li_2O(BSL)为烧结助剂,采用传统陶瓷制备工艺制备BST-BSL复相陶瓷.用扫描电镜(SEM)和X射线衍射(XRD)分别研究BST-BSL的微观形貌和相组成,并测试BST-BSL的介电性能参数.结果表明:添加的少量B_2O_3-Li_2O-SiO_2在烧结过程中与BST主晶相发生复杂的化学反应,使BST的烧结温度由1 350℃降低到1 000℃以下;B_2O_3-Li_2O-SiO_2的添加大幅改善BST的介电常数温度稳定性,引入的非铁电第二相对BST铁电性的'稀释作用'使BST-BSL的可调率降低,但由于烧结助剂的添加量少,使BST-BSL在1 kV/mm外加偏场下的可调率仍在5%以上.
採用草痠鹽共沉澱工藝製備高反應活性Ba_(0.6)Sr_(0.4)TiO_3(BST)粉體,添加適量的B_2O_3-SiO_2-Li_2O(BSL)為燒結助劑,採用傳統陶瓷製備工藝製備BST-BSL複相陶瓷.用掃描電鏡(SEM)和X射線衍射(XRD)分彆研究BST-BSL的微觀形貌和相組成,併測試BST-BSL的介電性能參數.結果錶明:添加的少量B_2O_3-Li_2O-SiO_2在燒結過程中與BST主晶相髮生複雜的化學反應,使BST的燒結溫度由1 350℃降低到1 000℃以下;B_2O_3-Li_2O-SiO_2的添加大幅改善BST的介電常數溫度穩定性,引入的非鐵電第二相對BST鐵電性的'稀釋作用'使BST-BSL的可調率降低,但由于燒結助劑的添加量少,使BST-BSL在1 kV/mm外加偏場下的可調率仍在5%以上.
채용초산염공침정공예제비고반응활성Ba_(0.6)Sr_(0.4)TiO_3(BST)분체,첨가괄량적B_2O_3-SiO_2-Li_2O(BSL)위소결조제,채용전통도자제비공예제비BST-BSL복상도자.용소묘전경(SEM)화X사선연사(XRD)분별연구BST-BSL적미관형모화상조성,병측시BST-BSL적개전성능삼수.결과표명:첨가적소량B_2O_3-Li_2O-SiO_2재소결과정중여BST주정상발생복잡적화학반응,사BST적소결온도유1 350℃강저도1 000℃이하;B_2O_3-Li_2O-SiO_2적첨가대폭개선BST적개전상수온도은정성,인입적비철전제이상대BST철전성적'희석작용'사BST-BSL적가조솔강저,단유우소결조제적첨가량소,사BST-BSL재1 kV/mm외가편장하적가조솔잉재5%이상.
The barium strontium titanate(Ba_(0.6)Sr_(0.4)TiO_3,BST)powders with high activity were prepared by oxalate co-precipitation method.The barium strontium titanate composites(BST-BSL)doped by B_2O_3-SiO_2-Li_2O(BSL)were obtained by traditional solid phase method.Their structures and morphology were characterized by XRD and SEM.Experimental results show that the BST-BSL composites can be sintered at below 1 000 ℃.BST-BSL composites possess better permittivity-temperature character.However,the tunability of BST-BSL was decreased to 5%(measured at 1 Kv/mm)due to the nonferroelectric dilution effect of B_2O_3-SiO_2-Li_2O.
