13 Atomlu Cu-Ag-Au Üçlü Nanoalaşımların Kimyasal Sıralama ve Yapısal Özelliklerinin İncelenmesi

Year 2021, Volume: 9 Issue: 3 - Additional Issue, 461 - 473, 29.05.2021

Hüseyin Yıldırım

https://doi.org/10.29130/dubited.845551

Abstract

Bu çalışmada, 13 atomlu Cu-Ag-Au üçlü metal nanoalaşımların kimyasal sıralama ve yapısal özellikleri Gupta ve DFT düzeylerinde ve üç farklı kompozisyon sisteminde incelenmiştir. Cu-Ag-Au üçlü nanoalaşımların Gupta düzeyindeki lokal optimizasyonları Basin-Hopping algoritması kullanılarak gerçekleştirilmiştir. Optimizasyon sonuçları Ag atomlarının yüzeye yerleşmeyi tercih ettiğini göstermektedir. Cu ve Au atomlarının nanoalaşımların yüzeyine veya merkezine ayrışma eğilimlerinin ise kompozisyon sistemine göre değiştiği bulunmuştur. Cu-Ag-Au nanoalaşımlarının tüm kompozisyonları için en kararlı kimyasal düzene sahip yapılar DFT relaksasyonu ile yeniden optimize edilmiştir ve Gupta ve DFT düzeylerinin karışma enerjileri karşılaştırılmıştır. Karışma enerjisi analizi, Gupta seviyesinde bulunan Ag1AunCu12-n (n=0-12) ve Au1AgnCu12-n (n=0-12) kompozisyon sistemlerinin en kararlı yapısının DFT ile uyuşmadığını göstermiştir.

Keywords

Altın, Bakır, DFT, Gupta, Gümüş, Üçlü Nanoalaşım

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