The investigation of the structural, electronic, elastic, thermodynamic and phonon properties of OsAl in B2 crystal structure

Year 2019, , 64 - 69, 15.01.2019

Mustafa Özduran

https://doi.org/10.17714/gumusfenbil.412164

Abstract

A theoretical study of structural, electronic, elastic, thermodynamic and
phonon properties of OsAl compound is presented by performing ab initio
calculations based on density-functional theory using pseudopotential plane
wave method. The generalized-gradient approximation (GGA) is chosen for the
exchange–correlation energy. The calculated structural parameters, such as the
lattice constant, bulk modulus, second-order elastic constants, the electronic
band structures and the related total density of states and charge density are
presented. The calculations predict that OsAl is a metal in CsCl phase. The elastic
constants were derived from the stress–strain relation. Phonon-dispersion
curves were obtained using the first principles linear-response approach of the
density functional perturbation theory.

Keywords

Band structure, Bulk modulus, Phonon-dispersion curves, Phonon- frequencies, Ab initio calculations, Lattice constant

B2 Kristal Yapıdaki OsAl Bileşiğinin Yapısal, Elektronik, Elastik, Termodinamik ve Fonon Özelliklerinin İncelenmesi

Abstract

OsAl
bileşiğinin yapısal, elektronik, elastik, termodinamik ve fonon özelliklerinin
teorik olarak incelenmesi, pseudopotential düzlemsel dalga yöntemiyle
yoğunluk-fonksiyonel teoriye dayanan ab initio hesaplamaları yapılarak
sunulmuştur. Değiş-tokuş korelasyon enerjisi için Genelleştirilmiş Gradyent
Yaklaşımı seçildi. Örgü sabiti, bulk modülü, ikinci dereceden elastik sabitler,
elektronik band yapısı ve toplam durum yoğunlukları (DOS) gibi parametreler
hesaplandı. Yapılan hesaplamalar CsCl yapıdaki OsAl’nin bir metal
olduğunu göstermektedir. Elastik sabitler, zor-zorlanma ilişkisinden
türetilmiştir. Fonon dispersiyon eğrileri yoğunluk fonksiyonel pertürbasyon
teorisinin ilk prensip lineer tepki yaklaşımı kullanılarak elde edildi.

Keywords

Band yapısı, Bulk modülü, Fonon dispersiyon eğrileri, Fonon frekansları, İlk prensip hesaplamaları, Örgü sabiti

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