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Home > Effect of Transition Metals Doping on Phase Evaluation and Magnetic Properties of Fe46-28Cr-22Co-3Mo-Iti-M-Alloy

Effect of Transition Metals Doping on Phase Evaluation and Magnetic Properties of Fe46-28Cr-22Co-3Mo-Iti-M-Alloy

Thesis Info

Author

Inam Ullah Khan

Supervisor

Saif Ullah Awan

Department

Department of Physics

Program

RPH

Institute

COMSATS University Islamabad

Institute Type

Public

City

Islamabad

Province

Islamabad

Country

Pakistan

Thesis Completing Year

2016

Thesis Completion Status

Completed

Subject

Physics

Language

English

Added

2021-02-17 19:49:13

Modified

2023-01-06 19:20:37

ARI ID

1676720832365

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مقاطعہ قریش

مقاطعہ قریش
رفتہ رفتہ مسلمانوں کی تعداد میں اضافہ ہوتا گیا چند نفوس قدسیہ حضرت عمر ؓ اور حضرت حمزہ ؓ جیسے جری ، نڈر، صائب الرائے اور پختہ عزم و عقیدہ کے مالک تھے ۔ یہ نامور اور شہرت یافتہ لوگ تھے یہ بنیادی حیثیت رکھتے تھے ۔ ہمالیہ پہاڑ کااپنی جگہ سے ٹل جانا ممکن تھا لیکن ان کا اپنے موقف سے ہٹ جانا نا ممکن تھا ۔ صحابہ کرام کو جس قدر تشدد کا نشانہ بنایا کفار کو منہ کی کھانا پڑی اور جتنی شدت سے نا روا ظلم اور بہیمانہ سلوک روا رکھا گیا وہ اسی قدر نا کام اور نا مراد ہوئے ۔ کفار کے عزیز و اقارب ایک ایک کر کے اسلام قبول کر رہے تھے ۔ کلمہ حق کی صدا بلند کرنے اور اسلام کو سینے سے لگانے میں جو کچھ مسلمانوں پر بیتی اس کے تصور سے انسان لرزہ بر اندام ہو جاتا ہے ۔صحابہ کرام کے بجز حضور ﷺ بھی قریش کی ایذاء رسانیوں سے محفوظ نہ تھے کفار کے تیار شدہ (ready made ) اور آموختہ بچے آپ ﷺ پر پتھر برساتے اور گالیاں بکتے ، کبھی مجنون و ساحر اور کبھی کاہن و شاعر کہہ کر تمسخر اڑاتے ، آپ ﷺ پر کوڑا کرکٹ پھینکا جاتا ، اونٹ کی اوجھڑی آپ ﷺ کی پشت پر حالت نماز میں ڈال دیتے بعض دشمن راہ میں کانٹے بیچھاتے حتی کہ طائف میں انسانیت سوز ظلم کیا آوارہ لڑکوں کو پیچھے لگایا وہ آوازیں کستے ، پتھر پھینکتے جس سے آپ ﷺ لہو لہان ہو گئے اور خون سے جوتے بھر گئے۔ کسی نے چادر گلے میں ڈال کر بل کس دئیے کہ آنکھیں باہر نکل آئیں ۔اسلام سے بر گشتہ کرنے کے لیے دنیا بھر کے جتن کیے ۔ جب ہر حربہ اور ظلم و ستم میں بجھا...

Updike’s Use of the Qur’anic Verses in Terrorist

This article exposes Updike’s use of the Qur’anic verses in his novel Terrorist. Apparently, the writer wants to investigate a Muslim terrorist’s mind, which causes him to launch deadly attacks against the American people. However, the results of Updike’s investigation are problematic and subjective. Updike seems to be a new Orientalist who manipulates the Qur’anic scripture to assert his mastery, neutrality and intolerance of Islam for non-believers. It proves that his presentation of Islam is based on stereotyped myths and lies. The narrator claims that the protagonist “Ahmad”, under the guidance of his religious teacher Sheikh Ahmed, inspired by the irrational and suppressed tone of the Qur’an, commits a suicide attack at Lincoln Tunnel but in the end, he is persuaded by his Jewish- school- councilor to discard this idea. Conclusively, it sounds that Updike fails to detach himself from his characters and misuses the Qur’anic verses to defend his pre-supposed ideology against Islam.

Density Functional Studies of the Functional Magnetic Materials

Spin polarized calculations based on FP-(L)APW+lo method were performed on non-magnetic, ferromagnetic and antiferromagnetic phase of Bi2Fe4O9. Antiferromagnetic phase was energetically favourable. All exchange correlation functionals accurately describe structural properties of Bi2Fe4O9 but failed to calculate correct band structure. All exchange correlation functionals with U gave bandgap values (2.05 - 2.2eV) closer to experimental values (1.9 - 2.1 eV). The calculated DOS showed hybridization between Fe 3d and O 2p states along with minor overlap between Bi 6p and O 2p states in upper valance band. Lower conduction band was composed of Fe 3d states. Magnetic properties of Bi2Fe4O9 were due to Fe3+ ions having magnetic moment ~4μB. Induced magnetic moments at other atomic sites depend on their local environment. Charge density plots reveal slight covalent character and strong ionic character between Fe-O atoms and Bi-O atoms. In absorption spectrum peak at 1.5 eV was attributed to d-d transition of Fe3+ ions. While peak at 2.05 eV was ascribed to transitions from O 2p valence band to conduction band Fe 3d levels. Static dielectric constant and refractive index were 17.61 and 4.4 respectively. Reflectivity has peak at 15.75 and 18.37 eV (λ = 78.66 and 67.44 nm). Peak in energy loss spectrum at 21.99 eV corresponds to abrupt decrease of reflectivity. Spin polarized calculations of Fe doped ferromagnetic EuO (Eu0.75Fe0.25O, Eu0.50Fe0.50O and Eu0.25Fe0.75O) using mBJ+U method show that lattice constant linearly decrease with increasing doping concentration of Fe atoms. Semiconductor EuO shows metallic character when doped with Fe atoms. Doped EuO exhibit extra peaks of Fe atom 3d states between -10 to 3.5 eV in valence band. Decrease in bandgap was due to increased spd exchange interaction between band electrons and localized 3d electrons of transition atom. Effect of doping was found to be dependent on the location of dopant ions. Electronic and magnetic properties of ferromagnetic EuFeO3 were calculated using mBJ+U exchange correlation functional that better describe energy bandgap values of strongly correlated 4f system. The calculated bandgap 2.7 eV agrees with experimental value. EuFeO3 was found to be charge transfer insulator due to existence of bandgap between O 2p and Eu 4f states.