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Islam MR, Khan MKR, Hossain MS, Rahman MM, Haque MM, Aliuzzaman M, Alam MK, Sarker MSI. Structural, thermodynamic, and magnetic properties of SrFe 12O 19 hexaferrite modified by co-substitution of Cu and Gd. RSC Adv 2024; 14:7314-7328. [PMID: 38433931 PMCID: PMC10906010 DOI: 10.1039/d3ra08878b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Accepted: 02/16/2024] [Indexed: 03/05/2024] Open
Abstract
A hard magnetic system of SrFe12O19 nanomaterial was modified according to the composition of Sr0.95Gd0.05Fe12-xCuxO19 with x = 0.0, 0.30, and 0.60 using the sol-gel technique. The structures of the samples were evaluated using X-ray diffraction (XRD) along with Rietveld refinement, and an M-type hexaferrite with a hexagonal structure was confirmed with a trace amount of the α-Fe2O3 phase. In addition, transmission electron microscopy (TEM) analysis revealed polycrystalline nanoplates in all samples. Furthermore, the bond structures of the octahedral and tetrahedral sites along with the thermodynamic properties of these ferrites were extracted from the FTIR spectra at room temperature. The Debye temperature (θD) decreased from 755.9 K to 749.3 K due to the co-substitution of Gd3+ at Sr2+ and Cu2+ at Fe3+. The magnetic hysteresis (M-H) measurements revealed that the coercivity decreased from 5.3 kOe to 1.5 kOe along with the highest magnetization saturation (Ms) of 65.2 emu g-1 for the composition Sr0.95Gd0.05Fe11.7Cu0.3O19, which is suitable for industrial application. The effect of local crystalline anisotropy in magnetization was explored using the law of approach to saturation (LAS). Finally, thermo-magnetization was recorded in the range from 400 K to 5 K for cooling under zero field and in the presence of a 100 Oe field, and magnetic transitions were tracked due to the introduction of the foreign atoms of Gd and Cu into SrFe12O19.
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Affiliation(s)
- Md Roni Islam
- Department of Physics, Rajshahi University Rajshahi-6205 Bangladesh
| | - M K R Khan
- Department of Physics, Rajshahi University Rajshahi-6205 Bangladesh
| | - Md Sarowar Hossain
- Department of Physics, Faculty of Science and Technology (FST), American International University-Bangladesh (AIUB) Dhaka-1229 Bangladesh
| | - M M Rahman
- Department of Physics, Rajshahi University Rajshahi-6205 Bangladesh
| | - M Mahbubul Haque
- Materials Science Division, Atomic Energy Centre Dhaka-1000 Bangladesh
| | - M Aliuzzaman
- Nuclear Power and Energy Division, Bangladesh Atomic Energy Commission Dhaka-1207 Bangladesh
| | - M K Alam
- Department of Physics, Bangladesh University of Engineering & Technology Dhaka-1000 Bangladesh
| | - M S I Sarker
- Department of Physics, Rajshahi University Rajshahi-6205 Bangladesh
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Chakraborty A, Liton MNH, Sarker MSI, Rahman MM, Khan MKR. Exploration of the structural, vibrational, electronic, mechanical and thermal properties of Ru 4Al 3B 2 and Ru 9Al 3B 8: a DFT study. RSC Adv 2023; 13:28912-28930. [PMID: 37790092 PMCID: PMC10544048 DOI: 10.1039/d3ra05334b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2023] [Accepted: 09/26/2023] [Indexed: 10/05/2023] Open
Abstract
The structural, dynamical, electro-optical, mechanical, and thermal characteristics of the newly synthesized intermetallic compounds Ru4Al3B2 and Ru9Al3B8 have been studied under ambient and elevated pressure through density functional theory (DFT). The obtained lattice parameters of the compounds are consistent with the experimental values. The metallic character of these compounds is established by the band structure and density of states (DOS). The electronic charge density distribution and bond analysis imply that Ru4Al3B2 and Ru9Al3B8 have mainly both ionic and covalent bonding. The non-negative phonon dispersion frequency of the compounds reaffirms their dynamical stability. Both compounds are tough as well as have high melting points, and hence, can be applied in harsh conditions. Mechanical properties are significantly improved under pressure. Thermal barrier coating (TBC) is a possible field of application for both compounds. The different thermal properties such as the Debye temperature (ΘD), Grüneisen parameter (γ), melting temperature (Tm), minimum thermal conductivity (Kmin) and lattice thermal conductivity (κph) of these compounds have been studied to figure out the suitable application areas in thermally demanding situations. The pressure and temperature dependent bulk modulus (B) and other thermodynamic properties have also been analyzed, which suggested that the present compounds are strong candidates for device applications at high temperature and pressure. Owing to their high optical absorptivity and reflectivity in the UV region, they are also candidates for UV-based applications. Furthermore, they also have applicability in the fields of electronics, aviation, energy storage, and supercapacitor devices for their superior electronic, thermal and mechanical properties.
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Affiliation(s)
- Arpon Chakraborty
- Department of Physics, University of Rajshahi Rajshahi-6205 Bangladesh
| | - M N H Liton
- Department of Physics, University of Rajshahi Rajshahi-6205 Bangladesh
- Department of Physics, Begum Rokeya University Rangpur-5400 Bangladesh
| | - M S I Sarker
- Department of Physics, University of Rajshahi Rajshahi-6205 Bangladesh
| | - M M Rahman
- Department of Physics, University of Rajshahi Rajshahi-6205 Bangladesh
| | - M K R Khan
- Department of Physics, University of Rajshahi Rajshahi-6205 Bangladesh
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Ali MY, Khan MKR, Karim AMMT, Rahman MM, Kamruzzaman M. Effect of Ni doping on structure, morphology and opto-transport properties of spray pyrolised ZnO nano-fiber. Heliyon 2020; 6:e03588. [PMID: 32195402 PMCID: PMC7078279 DOI: 10.1016/j.heliyon.2020.e03588] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Revised: 01/19/2020] [Accepted: 03/10/2020] [Indexed: 12/03/2022] Open
Abstract
Nano-fiber structure of ZnO and Ni doped ZnO (Ni:ZnO) transparent thin films have been deposited on glass substrate at 350 °C at an ambient atmosphere via spray pyrolysis technique. The structural, surface morphological and opto-electrical properties of ZnO and Ni doped ZnO thin films have been investigated. The XRD patterns show that the films are of polycrystalline in nature having preferential orientation (0 0 2) plane for ZnO changes to (1 0 1) by Ni doping in ZnO matrix. Optical study exhibits red shifting in band gap energy with Ni doping due to sp-d hybridization and display high absorption coefficient of the order of 107 m-1. The photoluminescence (PL) spectra indicate blue emissions in all samples. Electrical measurement confirms the resistivity of the film decreases remarkably with Ni doping and electrical transport is mainly thermally activated. From Hall Effect study, it is confirmed that all the samples are n-type having carrier concentration of the order of 1018 cm-3. Both mobility and carrier concentrations of the films became higher than ZnO sample with the increase of Ni concentration.
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Affiliation(s)
- M Younus Ali
- Department of Physics, University of Rajshahi, Rajshahi-6205, Bangladesh
| | - M K R Khan
- Department of Physics, University of Rajshahi, Rajshahi-6205, Bangladesh
| | - A M M Tanveer Karim
- Department of Physics, Rajshahi University of Engineering and Technology, Rajshahi-6204, Bangladesh
| | - M Mozibur Rahman
- Department of Physics, University of Rajshahi, Rajshahi-6205, Bangladesh
| | - M Kamruzzaman
- Department of Physics, Begum Rokeya University, Rangpur, Rangpur 5400, Bangladesh
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Zheng JY, Oluoch G, Riaz Khan MK, Wang XX, Cai XY, Zhou ZL, Wang CY, Wang YH, Li XY, Liu F, Wang KB. Mapping QTLs for drought tolerance in an F2:3 population from an inter-specific cross between Gossypium tomentosum and Gossypium hirsutum. Genet Mol Res 2016; 15:gmr8477. [PMID: 27525919 DOI: 10.4238/gmr.15038477] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Cotton is one of the most important natural fiber crops in the world. Its growth and yield is greatly limited by drought. A quantitative trait locus (QTL) analysis was therefore conducted to investigate the genetic basis of drought tolerance in cotton (Gossypium spp) using 188 F2:3 lines developed from an inter-specific cross between a wild cotton species, G. tomentosum, and an upland cotton, G. hirsutum (CRI-12). A genetic map was constructed using 1295 simple sequence repeat markers, which amplified 1342 loci, distributed on 26 chromosomes, covering 3328.24 cM. A field experiment was conducted in two consecutive years (2014 and 2015) and 11 morphological and physiological traits were recorded under water-limited (W1)/well-watered (W2) regimes at three growth stages (bud, flowering, and full boll). The traits measured included chlorophyll content, plant height, leaf area, leaf number, leaf fresh weight, leaf dry weight, boll weight, number of bolls per plant, and the number of fruiting branches. Sixty-seven and 35 QTLs were found under the W1 and W2 conditions, respectively. Of these, the majority exhibited partial dominance or over-dominance genetic effects for increasing the trait values. Four consistent QTLs were found under the W1 treatment on chromosomes 5, 8, 9, and 16, whereas no consistent QTL was found in W2. Thirteen QTL clusters were also identified on nine chromosomes (2, 3, 5, 6, 9, 14, 15, 16, and 21). These results will help to elucidate the genetic basis of drought tolerance in cotton.
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Affiliation(s)
- J Y Zheng
- State Key Laboratory of Cotton Biology, Institute of Cotton Research of Chinese Academy of Agricultural Science, Anyang, Henan, China.,Economic Crops Research Institute of Xinjiang Academy of Agricultural Science, Urumqi, Xinjiang, China
| | - G Oluoch
- State Key Laboratory of Cotton Biology, Institute of Cotton Research of Chinese Academy of Agricultural Science, Anyang, Henan, China.,School of Biological and Physical Sciences, Jaramogi Oginga Odinga University of Science and Technology, Bondo, Kenya
| | - M K Riaz Khan
- State Key Laboratory of Cotton Biology, Institute of Cotton Research of Chinese Academy of Agricultural Science, Anyang, Henan, China
| | - X X Wang
- State Key Laboratory of Cotton Biology, Institute of Cotton Research of Chinese Academy of Agricultural Science, Anyang, Henan, China
| | - X Y Cai
- State Key Laboratory of Cotton Biology, Institute of Cotton Research of Chinese Academy of Agricultural Science, Anyang, Henan, China
| | - Z L Zhou
- State Key Laboratory of Cotton Biology, Institute of Cotton Research of Chinese Academy of Agricultural Science, Anyang, Henan, China
| | - C Y Wang
- State Key Laboratory of Cotton Biology, Institute of Cotton Research of Chinese Academy of Agricultural Science, Anyang, Henan, China
| | - Y H Wang
- State Key Laboratory of Cotton Biology, Institute of Cotton Research of Chinese Academy of Agricultural Science, Anyang, Henan, China
| | - X Y Li
- Economic Crops Research Institute of Xinjiang Academy of Agricultural Science, Urumqi, Xinjiang, China
| | - F Liu
- State Key Laboratory of Cotton Biology, Institute of Cotton Research of Chinese Academy of Agricultural Science, Anyang, Henan, China
| | - K B Wang
- State Key Laboratory of Cotton Biology, Institute of Cotton Research of Chinese Academy of Agricultural Science, Anyang, Henan, China
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Khan MKR, Thukral SS, Gaind R. Evaluation of a modified double-disc synergy test for detection of extended spectrum beta-lactamases in AMPC beta-lactamase-producing proteus mirabilis. Indian J Med Microbiol 2008; 26:58-61. [PMID: 18227600 DOI: 10.4103/0255-0857.38860] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
The detection of extended-spectrum beta-lactamases (ESBLs) in gram-negative bacteria that produce AmpC beta-lactamases is problematic. In the present study, the performance of modified double-disc synergy test (MDDST) that employs a combination of cefepime and piperacillin-tazobactam for the detection of Proteus mirabilis producing extended spectrum and AmpC beta-lactamases was evaluated and compared with double-disc synergy test (DDST) and NCCLS phenotypic disc confirmatory test (NCCLS-PDCT). A total of 90 clinical isolates of P. mirabilis , which met the CLSI (Clinical and Laboratory Standards Institute) screening criteria that these had broth microdilution (BMD) MIC of > or =2 mg/mL for at least one extended spectrum cephalosporin [ceftazidime (CAZ), cefotaxime (CTX) and cefpodoxime], were selected for the study. MDDST detected ESBLs in 40/90 of the isolates, whereas DDST detected ESBLs in only 25 isolates. NCCLS-PDCT could detect ESBLs in 39 isolates using CAZ and CAZ + clavulanic acid (CLA) combination, whereas CTX and CTX + CLA combination could detect only 37 isolates as ESBL positive. As many as 34/40 ESBL positive isolates were confirmed to be AmpC beta-lactamase positive by the modified three-dimensional test (MTDT). MDDST and NCCLS-PDCT could detect ESBLs in all the 34 AmpC positive isolates, whereas DDST could detect ESBLs in only 19 isolates. The study demonstrated that MDDST is superior to DDST and as sensitive as NCCLS-PDCT. However, MDDST seems to have enhanced potential for the detection of ESBLs in AmpC beta-lactamase-producing P. mirabilis .
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Affiliation(s)
- M K R Khan
- Department of Microbiology, V P Chest Institute, University of Delhi, Delhi - 110 007, India
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