MarieCurieMarie died ofleukaemia inJuly,1934Born in Warsaw onNovember7,1867ANobelPrizePioneeratthePantheonTheashesofMarieCurieandherhusbandPierrehavenowbeenlaidtorestunderthefamousdomeofthePantheon,inParis,alongsidetheauthorVictor Hugo,the politician Jean Jaures and theResistancefighter JeanMoulin.Throughherdiscoveryofradium,MarieCuriepaved thewayfornuclearphysicsandcancertherapy.Bornof Polishparents,shewasawoman of scienceand courage,compassionate yet stubbornlydetermined.Herresearchworkwastocostherher life.2026/2/2
2026/2/2 6 A Nobel Prize Pioneer at the Panthéon The ashes of Marie Curie and her husband Pierre have now been laid to rest under the famous dome of the Panthéon, in Paris, alongside the author Victor Hugo, the politician Jean Jaurès and the Resistance fighter Jean Moulin. Through her discovery of radium, Marie Curie paved the way for nuclear physics and cancer therapy. Born of Polish parents, she was a woman of science and courage, compassionate yet stubbornly determined. Her research work was to cost her her life. Born in Warsaw on November 7, 1867 Marie died of leukaemia in July, 1934
自发极化的产生(b)(a)图2.4BaTiO(a)和PbTiO(b)四方晶胞在a面上的投影与T重登的O未画出,顺电相:Ba:(0,0,0)Ti:(1/2,1/2,1/2),30:(1/2,1/2,0);(1/2, 0,1/2);(0,1/2,1/2)铁电相:Ba:(0,0,0)Ti:(1/2,1/2,1/2+0.0135)OI:(1/2,1/2,-0.0250),2OⅡ:(1/2,0,1/2-0.0150):(0,1/2,1/2-0.0150)2026/2/2
2026/2/2 7 自发极化的产生 顺电相:Ba:(0,0,0) Ti:(1/2,1/2 ,1/2), 3O: (1/2,1/2 ,0);(1/2,0 ,1/2); (0,1/2 ,1/2) 铁电相:Ba:(0,0,0) Ti:(1/2,1/2 ,1/2+0.0135), OⅠ:(1/2,1/2 ,-0.0250), 2OⅡ: (1/2,0 ,1/2-0.0150); (0,1/2 ,1/2-0.0150)
重要特征:铁电体的电滞回线(hysteresisloop)OD:PPAremanent polarizationBEOE:PsDspontaneouspolarizationAFOF: EcO电场EcoercivefieldHE:electricfieldP:polarizationamplitude图1.1铁电体的电滞回线2026/2/2
2026/2/2 8 重要特征:铁电体的电滞回线 (hysteresis loop ) OD: Pr remanent polarization OE: Ps spontaneous polarization OF: Ec coercive field E: electric field P: polarization amplitude P
2.研究内容:bulkmaterialsthin films@核心问题自发极化 spontaneous polarization@自发极化是怎样产生的?①自发极化与晶体结构和电子结构有什么关系?@在各种外界条件作用下极化状态怎样变化?@特殊的物理性质和应用2026/2/2
2026/2/2 9 2. 研究内容:bulk materials thin films @核心问题 自发极化 spontaneous polarization @自发极化是怎样产生的? @自发极化与晶体结构和电子结构有什么关系? @在各种外界条件作用下极化状态怎样变化? @特殊的物理性质和应用
五个研究阶段:(19201939年)第一阶段两种铁电结构材料,即罗息盐和KHPO系列第二阶段(1940一1958年)Landau铁电唯象phenomenological理论开始建立并趋于成熟;第三阶段(1959一70年代)铁电软模(Soft-Mode)理论出现和基本完善;第四阶段(80年代至今)主要研究各种非均匀系统。第五个阶段:96年开始铁电薄膜和铁电薄膜器件2026/2/2
2026/2/2 10 五个研究阶段: 第一阶段(1920—1939年) 两种铁电结构材料,即罗息盐和KH2PO4系列; 第二阶段(1940—1958年) Landau铁电唯象phenomenological理论开始建立 ,并趋于成熟; 第三阶段(1959—70年代) 铁电软模(Soft-Mode)理论出现和基本完善; 第四阶段(80年代至今) 主要研究各种非均匀系统。 第五个阶段:96年开始铁电薄膜和铁电薄膜器件