In this paper we have developed an effective interaction potential model to study the high pressure phase transition of transition metal compounds TiX (X=N,O), having B1 structure at room temperature. We have theoretically investigated phase transition pressures and volume collapses including the temperature effect, and found results well suited with available experimental data. The elastic constants are also reported. The inclusion of temperature effect in TBIP makes the present model suitable for theoretical high-pressure studies.
{"title":"Structural properties of TiN and TiO at high temperature and pressure","authors":"V. Thakre, Sadhna Singh, P. Bhardwaj, F. Shareef","doi":"10.1063/1.4790913","DOIUrl":"https://doi.org/10.1063/1.4790913","url":null,"abstract":"In this paper we have developed an effective interaction potential model to study the high pressure phase transition of transition metal compounds TiX (X=N,O), having B1 structure at room temperature. We have theoretically investigated phase transition pressures and volume collapses including the temperature effect, and found results well suited with available experimental data. The elastic constants are also reported. The inclusion of temperature effect in TBIP makes the present model suitable for theoretical high-pressure studies.","PeriodicalId":16850,"journal":{"name":"Journal of Physics C: Solid State Physics","volume":"1 1","pages":"66-67"},"PeriodicalIF":0.0,"publicationDate":"2013-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79998244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The synthesis method, structural and optical properties of sol-gel derived Zn1−xCrxO(0≤x≤0.06) nanoparticles has been reported. Rietveld refinement of X-ray diffraction pattern shows that all the samples are in single phase having wurtzite structure. It also confirms that Cr-ions are well incorporated into host lattice without changing the wurtzite structure of ZnO host lattice. X-ray diffraction and transmission electron microscopy observations showed the nanocrystalline nature of the samples. UV-Vis measurements show that the band gap is blue shifted in lower Cr-concentration and red shifted in higher Cr-concentration. This may be attributed due to the Burstein-Moss effect that prevails throughout this range of doping and sp-d exchange interaction which plays a significant role for higher Cr-concentration.
{"title":"Effects of Cr-doping on structural and optical properties of ZnO nanoparticles","authors":"Shiv Kumar, S. Chatterjee, A. Ghosh","doi":"10.1063/1.4791007","DOIUrl":"https://doi.org/10.1063/1.4791007","url":null,"abstract":"The synthesis method, structural and optical properties of sol-gel derived Zn1−xCrxO(0≤x≤0.06) nanoparticles has been reported. Rietveld refinement of X-ray diffraction pattern shows that all the samples are in single phase having wurtzite structure. It also confirms that Cr-ions are well incorporated into host lattice without changing the wurtzite structure of ZnO host lattice. X-ray diffraction and transmission electron microscopy observations showed the nanocrystalline nature of the samples. UV-Vis measurements show that the band gap is blue shifted in lower Cr-concentration and red shifted in higher Cr-concentration. This may be attributed due to the Burstein-Moss effect that prevails throughout this range of doping and sp-d exchange interaction which plays a significant role for higher Cr-concentration.","PeriodicalId":16850,"journal":{"name":"Journal of Physics C: Solid State Physics","volume":"80 1","pages":"254-255"},"PeriodicalIF":0.0,"publicationDate":"2013-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89919521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sm metal is a ferromagnet with a very small net magnetization as it comprises nearly compensated local moment (4f-orbital moment slightly greater than the 4f-spin moment) which is coupled to conduction electrons via RKKY exchange mechanism and results in antiferromagnetically coupled alignment between total local moment and the contribution from conduction electron polarization. Ferromagnetic Sm metal is considered to be in spin surplus state, as it yields magnetic compensation on doping with RE-ions (e.g., Nd) belonging to the first half of 4f-series. The results pertaining to identification and tuning of the exchange bias (EB) field in Nd doped Sm metal are presented.
{"title":"Exchange bias and its tuning in magnetic compensated Nd doped ferromagnetic samarium metal","authors":"S. Pandya, S. Ramakrishnan, A. Grover","doi":"10.1063/1.4791464","DOIUrl":"https://doi.org/10.1063/1.4791464","url":null,"abstract":"Sm metal is a ferromagnet with a very small net magnetization as it comprises nearly compensated local moment (4f-orbital moment slightly greater than the 4f-spin moment) which is coupled to conduction electrons via RKKY exchange mechanism and results in antiferromagnetically coupled alignment between total local moment and the contribution from conduction electron polarization. Ferromagnetic Sm metal is considered to be in spin surplus state, as it yields magnetic compensation on doping with RE-ions (e.g., Nd) belonging to the first half of 4f-series. The results pertaining to identification and tuning of the exchange bias (EB) field in Nd doped Sm metal are presented.","PeriodicalId":16850,"journal":{"name":"Journal of Physics C: Solid State Physics","volume":"90 1","pages":"1168-1169"},"PeriodicalIF":0.0,"publicationDate":"2013-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83910818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Muthukumar, G. Rey, G. Giusti, V. Consonni, E. Appert, H. Roussel, Arivuoli Dakshnamoorthy, D. Bellet
Textured FTO thin films were deposited on corning glass substrates at 420°C by ultrasonic spray pyrolysis method. The electrical, optical and structural properties of the prepared functional FTO thin films were investigated. Homogeneous textured columnar grain morphology was observed through FESEM. As prepared thin films exhibits polycrystalline cassiterite structure with preferred orientation along (200). FTO is a promising TCO as front electrodes of thin film solar cells because of their good electrical properties (4.3×10−4ω.cm) combined with high transmission properties (86%).
{"title":"Fluorine doped tin oxide (FTO) thin film as transparent conductive oxide (TCO) for photovoltaic applications","authors":"A. Muthukumar, G. Rey, G. Giusti, V. Consonni, E. Appert, H. Roussel, Arivuoli Dakshnamoorthy, D. Bellet","doi":"10.1063/1.4791235","DOIUrl":"https://doi.org/10.1063/1.4791235","url":null,"abstract":"Textured FTO thin films were deposited on corning glass substrates at 420°C by ultrasonic spray pyrolysis method. The electrical, optical and structural properties of the prepared functional FTO thin films were investigated. Homogeneous textured columnar grain morphology was observed through FESEM. As prepared thin films exhibits polycrystalline cassiterite structure with preferred orientation along (200). FTO is a promising TCO as front electrodes of thin film solar cells because of their good electrical properties (4.3×10−4ω.cm) combined with high transmission properties (86%).","PeriodicalId":16850,"journal":{"name":"Journal of Physics C: Solid State Physics","volume":"310 1","pages":"710-711"},"PeriodicalIF":0.0,"publicationDate":"2013-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76346492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Good quality direction controlled ADP single crystals has been grown. Effects of various dopants and additives on the solubility, growth rate, structural, optical, mechanical, dielectric properties, crystalline perfection and second harmonic generation efficiency of the crystals have been investigated. The high-resolution X-ray diffraction study shows that the crystalline perfection of the doped crystal is good. The relative SHG efficiency measurements revealed that the dopant has enhanced the efficiency.
{"title":"Development of high quality, direction controlled ADP single crystals and the effect of impurities on their growth","authors":"P. Rajesh, P. Ramasamy","doi":"10.1063/1.4791314","DOIUrl":"https://doi.org/10.1063/1.4791314","url":null,"abstract":"Good quality direction controlled ADP single crystals has been grown. Effects of various dopants and additives on the solubility, growth rate, structural, optical, mechanical, dielectric properties, crystalline perfection and second harmonic generation efficiency of the crystals have been investigated. The high-resolution X-ray diffraction study shows that the crystalline perfection of the doped crystal is good. The relative SHG efficiency measurements revealed that the dopant has enhanced the efficiency.","PeriodicalId":16850,"journal":{"name":"Journal of Physics C: Solid State Physics","volume":"43 1","pages":"868-869"},"PeriodicalIF":0.0,"publicationDate":"2013-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79007150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Chandramohan, V. Dhanasekaran, K. Sundaram, T. Mahalingam
Thin films of ZnAl2O4 were prepared by dip technique involving chemical solutions. Investigations on the effect of post heat treatment on the structural, optical properties of ZnAl2O4 thin films were studied and reported. Xray diffraction patterns revealed that the thin films are polycrystalline cubic structure of ZnAl2O4. The microstructural properties of ZnAl2O4 thin films were calculated and crystallite size tends to increase with increase of annealing temperatures. The texture coefficients have been evaluated and found to be greater than unity revealing high texturing of the architecture of the film. The optical band gap values were found to be in the range of 3.48 – 3.62 eV. The n and k were found to decrease with increase of post annealing temperature. The SEM revealed the uniform distribution of spherical grains.
{"title":"Annealing effect of double dip coated ZnAl2O4 thin films","authors":"R. Chandramohan, V. Dhanasekaran, K. Sundaram, T. Mahalingam","doi":"10.1063/1.4791205","DOIUrl":"https://doi.org/10.1063/1.4791205","url":null,"abstract":"Thin films of ZnAl2O4 were prepared by dip technique involving chemical solutions. Investigations on the effect of post heat treatment on the structural, optical properties of ZnAl2O4 thin films were studied and reported. Xray diffraction patterns revealed that the thin films are polycrystalline cubic structure of ZnAl2O4. The microstructural properties of ZnAl2O4 thin films were calculated and crystallite size tends to increase with increase of annealing temperatures. The texture coefficients have been evaluated and found to be greater than unity revealing high texturing of the architecture of the film. The optical band gap values were found to be in the range of 3.48 – 3.62 eV. The n and k were found to decrease with increase of post annealing temperature. The SEM revealed the uniform distribution of spherical grains.","PeriodicalId":16850,"journal":{"name":"Journal of Physics C: Solid State Physics","volume":"62 1","pages":"650-651"},"PeriodicalIF":0.0,"publicationDate":"2013-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80228441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. Garg, K. Pandey, A. Mishra, A. Singhal, Surinder M. Sharma
Angle dispersive x-ray diffraction studies were carried out on nano particles of iron doped indium oxide upto pressures of 52 GPa. Our studies show that it undergoes a reversible phase transition to the rhombohedral corrundum phase at ∼ 30 GPa. However, the diffraction peaks of the released phase are very broad and are overriding on a large background. This indicates that there is some disorder in the indium oxide lattice on release of pressure. The bulk modulus of the initial cubic phase was determined to be 186 GPa. It was observed that beyond 20 GPa the lattice of iron doped indium oxide became very incompressible with an average compressibility of 0.16 % compared to ∼ 0.5 % for the initial phase. This may be attributed to iron doping.
{"title":"Enhanced incompressibility in iron doped nano particles of indium sesquioxide under high pressure","authors":"N. Garg, K. Pandey, A. Mishra, A. Singhal, Surinder M. Sharma","doi":"10.1063/1.4790932","DOIUrl":"https://doi.org/10.1063/1.4790932","url":null,"abstract":"Angle dispersive x-ray diffraction studies were carried out on nano particles of iron doped indium oxide upto pressures of 52 GPa. Our studies show that it undergoes a reversible phase transition to the rhombohedral corrundum phase at ∼ 30 GPa. However, the diffraction peaks of the released phase are very broad and are overriding on a large background. This indicates that there is some disorder in the indium oxide lattice on release of pressure. The bulk modulus of the initial cubic phase was determined to be 186 GPa. It was observed that beyond 20 GPa the lattice of iron doped indium oxide became very incompressible with an average compressibility of 0.16 % compared to ∼ 0.5 % for the initial phase. This may be attributed to iron doping.","PeriodicalId":16850,"journal":{"name":"Journal of Physics C: Solid State Physics","volume":"47 1","pages":"104-105"},"PeriodicalIF":0.0,"publicationDate":"2013-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81199164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The present paper summarizes the results concerning the luminescence (excitation and emission), ac-conductivity and magnetic properties of Mn2+(0.5mol%):30Li2O−20LiF−45.5B2O3−4CdO (LFBCd) glasses using a melt quenching technique. The excitation spectrum of Mn2+:LFBCd glass has shown two bands at 363 nm (6A1g(S)→4T2g(D)) and the other at 415 nm (6A1g(S)→4A1g(G),4Eg(G)). With an excitation peak (λexci) at 415 nm, a broad emission band is observed in the orange-red region at 608 nm(4T1g(G)→6A1g(S)). The ac-conductivity of Mn2+:LFBCd glass is measured in the frequency range 1 Hz to 1 MHz at room temperature and it is found to increase with the frequency and its value is calculated to be 2.69 × 10−5 S/cm. Besides this, magnetic behaviors of Mn2+: glasses have also been studied and found that are in paramagnetic nature.
{"title":"Luminescence, electrical and magnetic studies of Mn2+:Li2O−LiF−B2O3−CdO glasses","authors":"V. Naresh, S. Buddhudu","doi":"10.1063/1.4791181","DOIUrl":"https://doi.org/10.1063/1.4791181","url":null,"abstract":"The present paper summarizes the results concerning the luminescence (excitation and emission), ac-conductivity and magnetic properties of Mn2+(0.5mol%):30Li2O−20LiF−45.5B2O3−4CdO (LFBCd) glasses using a melt quenching technique. The excitation spectrum of Mn2+:LFBCd glass has shown two bands at 363 nm (6A1g(S)→4T2g(D)) and the other at 415 nm (6A1g(S)→4A1g(G),4Eg(G)). With an excitation peak (λexci) at 415 nm, a broad emission band is observed in the orange-red region at 608 nm(4T1g(G)→6A1g(S)). The ac-conductivity of Mn2+:LFBCd glass is measured in the frequency range 1 Hz to 1 MHz at room temperature and it is found to increase with the frequency and its value is calculated to be 2.69 × 10−5 S/cm. Besides this, magnetic behaviors of Mn2+: glasses have also been studied and found that are in paramagnetic nature.","PeriodicalId":16850,"journal":{"name":"Journal of Physics C: Solid State Physics","volume":"9 1","pages":"602-603"},"PeriodicalIF":0.0,"publicationDate":"2013-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75573572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Thermal instability in nanocrystalline (nc) Ni with a grain size of ∼60 nm was studied in detail. The kinetics of thermal grain growth behavior was studied by DSC and resistivity experiments. Thermal instability was characterized by determining the activation energy required for grain growth in the temperature range of 100-400 °C. The activation energy was found to be ∼ 100 kJ/mol below Curie temperature and ∼ 298 kJ/mol above Curie temperature. The effect of grain size on hardness and activation volume was investigated using nanoindentation technique. The interaction of dislocations-grain boundaries mediated mechanism was found to be the rate controlling plastic deformation mechanism.
{"title":"Grain growth kinetics and its effect on instrumented indentation response to nanocrystalline Ni","authors":"A. Chatterjee, G. Sharma, J. Chakravartty","doi":"10.1063/1.4790970","DOIUrl":"https://doi.org/10.1063/1.4790970","url":null,"abstract":"Thermal instability in nanocrystalline (nc) Ni with a grain size of ∼60 nm was studied in detail. The kinetics of thermal grain growth behavior was studied by DSC and resistivity experiments. Thermal instability was characterized by determining the activation energy required for grain growth in the temperature range of 100-400 °C. The activation energy was found to be ∼ 100 kJ/mol below Curie temperature and ∼ 298 kJ/mol above Curie temperature. The effect of grain size on hardness and activation volume was investigated using nanoindentation technique. The interaction of dislocations-grain boundaries mediated mechanism was found to be the rate controlling plastic deformation mechanism.","PeriodicalId":16850,"journal":{"name":"Journal of Physics C: Solid State Physics","volume":"10 1","pages":"180-181"},"PeriodicalIF":0.0,"publicationDate":"2013-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74398464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-01-01DOI: 10.1016/B978-0-12-408130-7.00010-1
G. Srinivasan, M. Popov, I. Zavislyak
{"title":"Chapter Ten – Dielectric Resonance in Ferrites for Sub-THz Signal-Processing Devices","authors":"G. Srinivasan, M. Popov, I. Zavislyak","doi":"10.1016/B978-0-12-408130-7.00010-1","DOIUrl":"https://doi.org/10.1016/B978-0-12-408130-7.00010-1","url":null,"abstract":"","PeriodicalId":16850,"journal":{"name":"Journal of Physics C: Solid State Physics","volume":"1 1","pages":"349-363"},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88654560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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