Dejun LI
材料科学技术（英文）
Multilayered ZrAlN/ZrB2 coatings containing alternating bilayer periods were synthesized by dc magnetron sputtering technique. The intensities of ZrN (111) or ZrN (200) textures in the structure of the nanolayers depended on the bilayer period as well as N2 gas partial pressure during deposition. Nanoindentation testing showed that hardness and internal stress of the nanolayers varied with the bilayer period and crystallographic orientation in the coatings. The hardness of the nanolayers with bilayer periods of 3~6 nm was enhanced (~27%) over the rule-of-mixture value. A low percent of N2 in processing gas was proved to be benefitial to the synthesis of high hard nanoscale multilayered coatings.
关键词:
Nanoscale multiplayer
,
超晶格
,
磁控溅射
王萌
,
谭雪莲
,
吴文彬
低温物理学报
本文采用脉冲激光沉积(PLD)方法,在NdGaO3 (110)衬底上制备出了由钙钛矿锰氧化物材料La0.7Sr0.3MnO3和正铁氧体材料SmFeO构成的高质量外延超晶格.在这一超晶格体系中,固定层数不变,当La0.7Sr0.3MnO层厚度大于SmFeO层的厚度时,超品格的晶格逐渐发生弛豫,反之,则与衬底很好地共格.此外,伴随着这种应变状态的改变,超晶格的磁转变温度TC逐步增加,易磁化轴发生转变.我们认为这种应力状态以及磁性质的改变来源于强正交性的SrnFeO3与菱形La0.7Sr0.3MnO3中氧八面体的界面耦合.
关键词:
超晶格
,
应力效应
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界面耦合
