共查询到18条相似文献,搜索用时 156 毫秒
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采用脉冲激光沉积法制备了0.65 BT-0.35NBT/SRO/STO异质结构薄膜.通过XRD、AFM和SEM分析了0.65BT-0.35NBT薄膜的微观结构.XRD结果表明:0.65BT-0.35NBT为钙钛矿结构,其薄膜为沿c轴择优取向生长结构.0.65BT-0.35NBT薄膜表现出优异的铁电和压电性能,剩余极化强度达到38.1 μC/cm2.0.65 BT-0.35NBT薄膜的居里温度(Tc ~ 223℃)明显高于BTO的居里温度,是一种具有优异电学性能和较高的居里温度的BTO基铁电材料. 相似文献
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采用脉冲激光沉积方法,在硅基片上先沉积MgO或CeO2缓冲层后再制备BaTiO3(BTO)铁电薄膜.通过原位反射高能电子衍射来监测MgO,CeO2缓冲层在硅基片上的生长行为.用X射线衍射测定BTO薄膜的结晶取向.并利用压电响应力显微镜观察了铁电薄膜的自发极化形成的铁电畴.结果表明:BTO薄膜在不同的缓冲层硅基片上以不同的取向生长,在织构的MgO/Si(001)基片上为(001)择优,择优程度与MgO织构品质有关,其中在双轴织构MgO缓冲层上为(001)单一取向;在CeO2(111)缓冲层上为(011)单一取向.(001)取向的BTO薄膜具有更大的面外极化,而(011)取向的BTO薄膜具有更大的面内极化. 相似文献
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掺杂Hf O2铁电薄膜在非易失性存储器件中的重要应用前景使其成为当前凝聚态物理与材料科学领域的一个研究热点。近年来,结果表明:La掺杂Hf O2拥有优异的铁电性能,铁电剩余极化强度为45μC/cm2,是目前Hf O2基薄膜材料中报道的最高值。由于Nd与La的化学性质相近,Nd掺杂同样有望增强HfO2的铁电性,但相关研究工作却鲜有报道。使用氧化物分子束外延技术,在La0.67Sr0.33Mn O3(底电极)/SrTiO3(001)衬底上外延生长高质量Nd掺杂Hf O2(Nd:HfO2)薄膜。X射线衍射以及高分辨电镜表征结果均显示Nd掺杂有助于诱导Hf O2从单斜相向正交相的转变,压电力显微镜和铁电测试仪进一步证实正交相Nd:Hf O2具有良好的铁电性。此外,高分辨电子显微镜表征还发现Nd:Hf O... 相似文献
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铁电薄膜的微图形化研究 总被引:9,自引:0,他引:9
铁电薄膜在微电子和光电子技术中有着重要的或潜在的应用,可以制作随机存取存储器,热释电阵列探测器,铁民微电子机械系统等,在这些器件的制作过程中,铁电薄膜的微图形化是非常重要的一环,本文简要介绍了几种重要的铁电薄膜微图形化方法及有关研究结果,并比较了这些方法的优缺点。 相似文献
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利用化学溶液沉积法在Pt/Ti/Si O2/Si(100)基底和700℃条件下分别制备了Nd和Mg(不同浓度)共掺杂的钛酸铋薄膜Bi3.15Nd0.85Ti(3-x)Mg2xO12(BNTM)(x=0.00,0.06,0.10和0.14),并进行了这一系列薄膜的包括微结构、介电、铁电和漏电流等特性的研究和对比。发现当Mg含量为x=0.10时,薄膜具有较高的剩余极化强度(2Pr=33.40μC/cm2)和介电常数(ε=538,频率为1k Hz),其漏电流密度为10-8A/cm2。讨论了相关的物理机制。 相似文献
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A technique has been developed for the TEM examination of ferroelectric thin films in transverse section. Some preliminary results are reported for three different thin-film/substrate systems. The microstructures of thin films of lead scandium tantalate deposited onto sapphire and MgO, and lead titanate deposited onto AIN, have been examined, with particular attention being paid to the quality of the thin-film/substrate interfaces and to the changes in the nature of the microstructures of the thin films as a function of distance from their substrates. It is demonstrated that the technique successfully produces adequate electron transparent regions for the characterization of the thin-film/substrate interface of all the samples examined and that it is possible to prepare transverse sections of ferroelectric thin films routinely. 相似文献
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Minoru Noda Yoshinorimatsumuro Hideki Sugiyama Masanori Okuyama 《Ferroelectrics Letters Section》1999,26(1):17-28
Preferentially (105)-oriented Sr0.7B12.8Ta2O9 thin films on SiO2/n-Si(100) have been prepared by Pulsed Laser Deposition (PLD) at low temperature as low as 350°C, which is the lowest process temperature for growing SrxBiyTa2O9(SBTO) ferroelectric thin films. Insulating properties of the SBTO film have been improved by lowering the process temperature or by increasing Sr/Bi atomic ratio from 0.7/2.8 to 0.7/2.0. After applying the low leakage SBTO films to Metal-Ferroelectric-Insulator-Semiconductor diode structures, it is finally observed that their C-V curves have counterclockwise dielectric hysteresis that indicates the films' ferroelectric hysteresis sufficiently control the Si surface potential. A low temperature process in preparing ferroelectric thin film and Sr-deficient and Bi-excess SBTO thin film by PLD method are very effective and promising for realizing an excellent MFIS FET structure. 相似文献
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Cr-substituted BiFeO3 (BFCr) thin films prepared from precursor solutions with stoichiometric composition and various excess Bi contents ranged from 5 to 20 mol% were fabricated on Pt/TiO2/SiO2/Si(100) substrates by a chemical solution deposition method, and the effects of excess Bi content in precursor solutions on the ferroelectric properties of the as-deposited BFCr thin films were studied. It was found that the BFCr thin film prepared from precursor solution with excess Bi content of 5 mol% exhibited the best dielectric constant-frequency and polarization-electric field characteristics. In detail, its dielectric constant is 158 at frequency of 100 kHz and remnant polarization (Pr) value is 49 μ C/cm2 at electric field of 600 kV/cm. 相似文献
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综述了迅速发展的计算机用新型氧化铋系层状铁电薄膜记忆材料的晶体结构、极化特点、应用原理以及它与传统PZT类材料相比的优越性。概述了此类薄膜的制备方法,分析了该类薄膜目前尚存在的问题并展望了未来发展的趋势。 相似文献