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説明:

Density functional theory (DFT) has been adopted to understand ferroelectricity in wurtzite (WZ)-type aluminum nitride (AlN). In particular, total energy of strained WZ-phase was compared with that of non-polar (NP)-phase as a transient state during polarity switching, aiming to predict possible lowering of coercive field, Ec by lattice deformation. It is confirmed that shrinkage of c-axis length and expansion of a-axis length are favorable for reduction of Ec. In addition, predicted residual stress appearing in transient NP-phase was obviously high, such as 30 GPa. These results suggest that attention to such high residual stress may be necessary to clarify polarity switching behavior under very high electric field.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: AlN, DFT, Strain, Stress, Ferrorlrctricity

刊行年月日: 2022-07-01

出版者: Ceramic Society of Japan

掲載誌:

• Journal of the Ceramic Society of Japan (ISSN: 13486535) vol. 130 issue. 7 p. 452-457 21190

研究助成金:

• MEXT JPMXP0112101001
• JST JPMJPR20B3

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.2109/jcersj2.21190

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更新時刻: 2025-04-14 16:30:59 +0900

MDRでの公開時刻: 2025-04-14 14:56:21 +0900