Experimental verification of vacancy defects and their vital role on reddish Bi4Ge3O12 single crystals

2021 ◽  
Author(s):  
Lanying Yuan ◽  
Haihong Ni ◽  
Junfeng Chen ◽  
Xuejun Qi ◽  
Xiang Li ◽  
...  
Keyword(s):  
Single Crystals ◽  
Experimental Verification ◽  
Vital Role ◽  
Vacancy Defects

Properties of vacancy defects in GaAs single crystals

1975 ◽  
Vol 46 (7) ◽  
pp. 2986-2991 ◽  
Author(s):  
S. Y. Chiang ◽  
G. L. Pearson
Keyword(s):  
Single Crystals ◽  
Vacancy Defects

scholarly journals Compressive Behavior of Carbon Nanotube Reinforced Polypropylene Composites Under High Strain Rate: Insights From Molecular Dynamics

2021 ◽  
Author(s):  
Brijesh Mishra ◽  
Sumit Sharma
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotube ◽  
Strain Rate ◽  
Compressive Strain ◽  
Md Simulations ◽  
Vital Role ◽  
Key Factors ◽  
Single Walled Carbon Nanotube ◽  
Vacancy Defects ◽  
Polypropylene Composites

Abstract Since the discovery of carbon nanotubes (CNTs), these have received a lot of attention because of their unusual mechanical electrical properties. Strain rate is one of the key factors that play a vital role in enhancing the mechanical properties of nanocomposites. In this study, (4, 4) armchair single-walled carbon nanotube (SWCNT) was employed with the polymer matrix as polypropylene (PP). The influence of compressive strain rate on SWCNT/PP nanocomposites was evaluated using MD simulations, and mechanical properties have been predicted. Stone-Wales (SW) and vacancy defects, were integrated on the SWCNT. The maximum Young’s modulus (E) of 81.501 GPa was found for the pristine SWCNT/PP composite for a strain rate of 1010 s-1. The least value of E was 45.073GPa for 6% SW defective/PP composite for a strain rate of 108 s-1. While the 6% vacancy defective CNT/PP composite showed the lowest value of E as 39.57GPa for strain rate 108 s-1. It was found that the mechanical properties of SWCNT/PP nanocomposites decrease with the increase in percent defect. It was also seen that the mechanical properties were enhanced with the increment in the applied strain rate. The results obtained from this study could be useful for the researchers designing PP-based materials for compression loading to be used for biomedical applications.

Reply to ‘Comment on “Zero-thermal-quenching and photoluminescence tuning with the assistance of carriers from defect cluster traps”’

2020 ◽  
Vol 8 (3) ◽  
pp. 1153-1156
Author(s):  
Yali Chen ◽  
Binxun Yu ◽  
Jing Gou ◽  
Shengzhong Frank Liu
Keyword(s):  
Thermal Quenching ◽  
Vital Role ◽  
Defect Cluster ◽  
Zinc Vacancy ◽  
Vacancy Defects ◽  
Photoluminescence Behavior

In this response to the comments on our article, a series of Sr8Zn1−xSc(PO4)7:12%Tb3+ (SZ1−xSPO:12%Tb3+) phosphors were synthesized, and their photoluminescence behavior confirmed that zinc vacancy defects play a vital role in the SZ1−xSPO:12%Tb3+ phosphor.

Thermal evolution of vacancy defects induced in 12 MeV H+irradiated 6H-SiC single crystals

2007 ◽  
Vol 4 (10) ◽  
pp. 3650-3653 ◽  
Author(s):  
X. Kerbiriou ◽  
M.-F. Barthe ◽  
A. Gentils ◽  
P. Desgardin
Keyword(s):  
Single Crystals ◽  
Thermal Evolution ◽  
Vacancy Defects

scholarly journals Role of Defects on Electronic Properties in Various Mono Layer Transition Metal Dichalcogenides

2021 ◽  
Author(s):  
Ravinder Pawar
Keyword(s):  
Transition Metal ◽  
Band Gap ◽  
Density Functional ◽  
Transition Metal Dichalcogenides ◽  
Impurity Band ◽  
Vital Role ◽  
Layer Transition ◽  
Vacancy Defects ◽  
Metal Dichalcogenides ◽  
Indirect Band Gap

The chalcogen vacancy defects in various transition metal dichalcogenides (TMDCs) have been studied using density functional theory (DFT) calculation. Results reveal that (i) the dissociation energy value depends on both nature of chalcogen and transition metal, (ii) the work function depends marginally on the single or double vacancies, (iii) the defect transforms direct band gap to indirect band gap materials (i.e. the pristine materials show KVKC transition whereas defective materials show ΓVKC) and (iii) the d-orbital of the transition metal plays a vital role in the formation of impurity band.

scholarly journals Growth, structural, thermal and optical properties of Mg2+ -Co2+ doped potassium acid phthalate crystals

2014 ◽  
Vol 37 (2) ◽  
pp. 165-172 ◽  
Author(s):  
Mostak Hossain ◽  
Shahan Ara Begum ◽  
Jiban Podder
Keyword(s):  
Single Crystals ◽  
Optical Transmission ◽  
Vital Role ◽  
Secondary Nucleation ◽  
Optically Transparent ◽  
Isothermal Evaporation ◽  
Potassium Acid Phthalate ◽  
Academy Of Sciences ◽  
Co Doped ◽  
Acid Phthalate

Single crystals of pure potassium acid phthalate (KAP) and magnesium-cobalt (Mg2+-Co2+) co-doped potassium acid phthalate crystals were grown by an isothermal evaporation method. Optically transparent and coloured KAP single crystals were grown by doping divalent bimetallic impurities. Enhancement of the metastable zonewidth was achieved by the addition of co-doped bimetallic impurities in KAP solution. It is anticipated that these larger cations play a vital role in the growth mechanism and it favours to reduce the formation of secondary nucleation by positioning the doped metal ions into the interstitial sites. The XRD results confirm that the incorporation of bimetallic ions into the KAP crystal lattice. The optical transmission is found to decrease in Mg-Co doped crystals compared to that of pure KAP. DOI: http://dx.doi.org/10.3329/jbas.v37i2.17557 Journal of Bangladesh Academy of Sciences, Vol. 37, No. 2, 165-172, 2013

scholarly journals Effects of Co-Doped Bimetallic Impurities on the Growth and Nucleation Kinetics of Potassium Acid Phthalate (KAP)

1970 ◽  
Vol 33 (2) ◽  
pp. 189-197 ◽  
Author(s):  
SA Begum ◽  
J Podder
Keyword(s):  
Induction Period ◽  
Single Crystals ◽  
Vital Role ◽  
Nucleation Kinetics ◽  
Supersaturation Ratio ◽  
Potassium Acid Phthalate ◽  
Academy Of Sciences ◽  
Critical Nuclei ◽  
Co Doped ◽  
Acid Phthalate

Single crystals of pure potassium acid phthalate (KAP) and nickel-magnesium (Ni-Mg), cobalt-magnesium (Co2+-Mg2+) and lithium-magnesium (Li1+-Mg2+) co-doped potassium acid phthalate crystals were grown by an isothermal evaporation method. Good quality and optically transparent single crystals of pure and bimetallic doped KAP were grown. Enhancement of the metastable zonewidth was achieved by the addition of co-doped novel bimetallic impurities in KAP solution. The induction period and various critical nucleation parameters such as radius of critical nucleus, number of molecules in the critical nuclei and the critical free energy change were calculated based on the classical theory for homogeneous nucleation. The induction period decreases exponentially with supersaturation ratio and hence the nucleation rate increases with the increase of supersaturation ratio for all systems. Subsequent incorporation of these bimetallic co-doped impurities into the crystal would allow the growth rate to achieve its maximum value. The induction period is found to increase with the incorporation of Ni2+, Co2+and Li1+ ions doped along with Mg2+ ions in KAP. It is anticipated that these larger cations play a vital role in the growth mechanism and it favors to reduce the formation of secondary nucleation by positioning the doped metal ions into the interstitial sites. DOI: 10.3329/jbas.v33i2.4102 Journal of Bangladesh Academy of Sciences, Vol. 33, No. 2, 189-197, 2009

Sign in / Sign up

Export Citation Format

Share Document