Pub Date : 2012-08-31DOI: 10.5923/J.MATERIALS.20120204.05
A. Selçuk, S. Ocak, S. Karadeniz
The Al/ /p-Si Schottky diodes (39 dots) with native interfacial insulator layer SiO2 were fabricated on the same Si wafer. The current-voltage (I-V) and capacitance-voltage (C-V) characteristics of metal-o xide -semiconductor diodes, which are based on Al/SiO2/p-Si structures, have been measured at room temperature. Barrier height (BH), ideality factor (n) of these diodes has been calculated fro m their experimental forward b ias current-voltage (I-V), reverse bias capaci- tance-voltage. Even though they are identically performed on the same quarter Si wafer, the calculated values of BH, wh ich is obtained from I-V characteristic, have ranged fro m 0.687 to 0.772 eV and ideality factor n fro m 1.903 to 4.48. The values of barrier heights obtained from C -V characteristics range fro m 0.629 to 1.097 eV. It was found that the values of barrier height Φ ������������ obtained C-V characteristics is larger than that of these values fro m I-V characteristics. The experimental values BH distribution obtained from I-V and C -2 -V characteristics have been fitted by Gaussian function and their mean values of BHs have been calculated to be 0.730 and 0.863 respectively. Normal d istribution of ideality factors mean value is 3.160 with standard deviation 0.689. Experimental results show that the interface states at a native insulator layer between metal and semiconductor play an important role in the value of the BH, ideality factor and the other electrical parameters of Schottky diodes.
{"title":"Gaussian Distribution on Electrical Characteristics of Al/SiO 2 /p-Si Structures","authors":"A. Selçuk, S. Ocak, S. Karadeniz","doi":"10.5923/J.MATERIALS.20120204.05","DOIUrl":"https://doi.org/10.5923/J.MATERIALS.20120204.05","url":null,"abstract":"The Al/ /p-Si Schottky diodes (39 dots) with native interfacial insulator layer SiO2 were fabricated on the same Si wafer. The current-voltage (I-V) and capacitance-voltage (C-V) characteristics of metal-o xide -semiconductor diodes, which are based on Al/SiO2/p-Si structures, have been measured at room temperature. Barrier height (BH), ideality factor (n) of these diodes has been calculated fro m their experimental forward b ias current-voltage (I-V), reverse bias capaci- tance-voltage. Even though they are identically performed on the same quarter Si wafer, the calculated values of BH, wh ich is obtained from I-V characteristic, have ranged fro m 0.687 to 0.772 eV and ideality factor n fro m 1.903 to 4.48. The values of barrier heights obtained from C -V characteristics range fro m 0.629 to 1.097 eV. It was found that the values of barrier height Φ ������������ obtained C-V characteristics is larger than that of these values fro m I-V characteristics. The experimental values BH distribution obtained from I-V and C -2 -V characteristics have been fitted by Gaussian function and their mean values of BHs have been calculated to be 0.730 and 0.863 respectively. Normal d istribution of ideality factors mean value is 3.160 with standard deviation 0.689. Experimental results show that the interface states at a native insulator layer between metal and semiconductor play an important role in the value of the BH, ideality factor and the other electrical parameters of Schottky diodes.","PeriodicalId":7420,"journal":{"name":"American Journal of Materials Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87189910","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 : 2012-08-31DOI: 10.5923/J.MATERIALS.20120203.08
Francisco E.F. Almeida, R. A. C. Santana, S. J. Lima, S. Prasad, R. M. Gomes
This paper presents a study on microstructure, elasticity modulus and electrochemical behavior of Ti-26Nb, Ti-26Zr and Ti-26Ta binary alloys obtained in an induction furnace equipped with a water cooled copper crucible which can promote levitation of the moltem alloys. The microstructures and eletrochemical behavior were investigated by means of X-ray fluorescence spectroscopy, X-ray diffractometry, optical microscopy, microvickers hardness, open circuit poten- tial, corrosion potential and polarization resistance. The results revealed that the difference in nominal chemical composi- tion related to contamination was extremely low, which indicates that this melting technique is highly appropriate for ob- taining contaminant-free titanium alloy. The addition of niobium was very favorable for obtaining near-β alloy with a low elasticity modulus. Additionally, alloy Ti-26Nb presented the best corrosion resistance combined with low elasticity modulus.
{"title":"Microstructure and Electrochemical Behavior of in Vitro Ti-26Nb, Ti-26Zr and Ti-26Ta Alloys Processed by Levitation Melting Technique","authors":"Francisco E.F. Almeida, R. A. C. Santana, S. J. Lima, S. Prasad, R. M. Gomes","doi":"10.5923/J.MATERIALS.20120203.08","DOIUrl":"https://doi.org/10.5923/J.MATERIALS.20120203.08","url":null,"abstract":"This paper presents a study on microstructure, elasticity modulus and electrochemical behavior of Ti-26Nb, Ti-26Zr and Ti-26Ta binary alloys obtained in an induction furnace equipped with a water cooled copper crucible which can promote levitation of the moltem alloys. The microstructures and eletrochemical behavior were investigated by means of X-ray fluorescence spectroscopy, X-ray diffractometry, optical microscopy, microvickers hardness, open circuit poten- tial, corrosion potential and polarization resistance. The results revealed that the difference in nominal chemical composi- tion related to contamination was extremely low, which indicates that this melting technique is highly appropriate for ob- taining contaminant-free titanium alloy. The addition of niobium was very favorable for obtaining near-β alloy with a low elasticity modulus. Additionally, alloy Ti-26Nb presented the best corrosion resistance combined with low elasticity modulus.","PeriodicalId":7420,"journal":{"name":"American Journal of Materials Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89934424","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 : 2012-08-31DOI: 10.5923/J.MATERIALS.20120203.04
R. Behera, D. Chatterjee, G. Sutradhar
In the present work authors investigate the effect of weight percentage of SiCp on the fluidity and the rate solidification of stir cast MMCs. Experiments were carried out over range of particle weight percentage of 5.0-12.5 wt% in steps of 2.5wt%. Spiral castings and three-stepped castings of aluminum alloy (LM6) and its composites reinforced with different weight fractions SiCp have produced to study the fluidity of MMCs and solidification behavior of its castings by putting K-type thermocouples at the different step/section of the casting. The experimental results indicate that on increas- ing the weight percentage of reinforcement particles i.e. SiCp in cast aluminum alloy (LM6) MMCs the fluidity of cast composite metal decreases and the rate of solidification decreased due to which the total solidification time enhanced. This experimental result will offer good support for production of thin wall castings.
{"title":"Effect of Reinforcement Particles on the Fluidity and Solidification Behavior of the Stir Cast Aluminum Alloy Metal Matrix Composites","authors":"R. Behera, D. Chatterjee, G. Sutradhar","doi":"10.5923/J.MATERIALS.20120203.04","DOIUrl":"https://doi.org/10.5923/J.MATERIALS.20120203.04","url":null,"abstract":"In the present work authors investigate the effect of weight percentage of SiCp on the fluidity and the rate solidification of stir cast MMCs. Experiments were carried out over range of particle weight percentage of 5.0-12.5 wt% in steps of 2.5wt%. Spiral castings and three-stepped castings of aluminum alloy (LM6) and its composites reinforced with different weight fractions SiCp have produced to study the fluidity of MMCs and solidification behavior of its castings by putting K-type thermocouples at the different step/section of the casting. The experimental results indicate that on increas- ing the weight percentage of reinforcement particles i.e. SiCp in cast aluminum alloy (LM6) MMCs the fluidity of cast composite metal decreases and the rate of solidification decreased due to which the total solidification time enhanced. This experimental result will offer good support for production of thin wall castings.","PeriodicalId":7420,"journal":{"name":"American Journal of Materials Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77862877","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 : 2012-08-31DOI: 10.5923/j.materials.20120204.01
R. Kumar, S. A. Imam, M. Beg
This paper represents a novel method of evaluation of band width of MEMS based embedded gas sensor by using the concept of adding white Noise. In this paper we are providing the details of MEMS based embedded gas sensor and adding a concept to evaluate narrowed bandwidth of MEMS based gas sensor. Novel technique includes the concept of amplitude demodulation and temperature modulation. The gas sensor virtual component encloses the sensor and its associated analog circuitry into a digital shell so that all interface connections to the virtual component are digital. The system architecture supports an array of gas sensor elements. System response time is limited by the sensor and is complex. Example gas sensor characterization results are presented showing isothermal response to carbon monoxide molecules with detection sensitivity better than 100 nanomoles/mole. In the present scenario all the sensors output is communicated through computer system so evaluation of Centre frequency and bandwidth is important. Bandwidth of MEMS based gas sensor is measured and compared with help of spectral analysis.
{"title":"A Novel Method for Evaluation of Band Width of MEMS-Based Embedded Gas Sensor","authors":"R. Kumar, S. A. Imam, M. Beg","doi":"10.5923/j.materials.20120204.01","DOIUrl":"https://doi.org/10.5923/j.materials.20120204.01","url":null,"abstract":"This paper represents a novel method of evaluation of band width of MEMS based embedded gas sensor by using the concept of adding white Noise. In this paper we are providing the details of MEMS based embedded gas sensor and adding a concept to evaluate narrowed bandwidth of MEMS based gas sensor. Novel technique includes the concept of amplitude demodulation and temperature modulation. The gas sensor virtual component encloses the sensor and its associated analog circuitry into a digital shell so that all interface connections to the virtual component are digital. The system architecture supports an array of gas sensor elements. System response time is limited by the sensor and is complex. Example gas sensor characterization results are presented showing isothermal response to carbon monoxide molecules with detection sensitivity better than 100 nanomoles/mole. In the present scenario all the sensors output is communicated through computer system so evaluation of Centre frequency and bandwidth is important. Bandwidth of MEMS based gas sensor is measured and compared with help of spectral analysis.","PeriodicalId":7420,"journal":{"name":"American Journal of Materials Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83198166","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 : 2012-08-31DOI: 10.5923/J.MATERIALS.20120202.07
V. Monfared
A novel mathematical model based on mapping function is presented for determination of exact steady state creep behaviour in short fiber metal matrix composites 6061Al/15%SiC (MMC's) subjected to axial loading. FEM and analytical steady state Creep behaviour of 6061Al/15%SiC (MMC's) composites wasn't coinciding to the previous experi- mental results in Prior researches. In this paper, transformation function is introduced in order to convert previous analytical and FEM results to experimental results correctly. Mapping function method (MFM) is exact approach for transformation of analytical and FEM results to experimental results in MMC's. Also, fiber behaviour is elastic unlike creep behaviour of matrix. In addition mapping transformation function is introduced analytically. Eventually, good agreement is established between the results of new mapping function method (MFM) and previous experimental results for prediction of steady state creep behaviour in short fiber composites (SFC's).
提出了基于映射函数的6061Al/15%SiC (MMC’s)短纤维金属基复合材料轴向载荷稳态蠕变精确测定数学模型。6061Al/15%SiC (MMC’s)复合材料的有限元分析和稳态蠕变行为与前人的实验结果不一致。为了将以往的分析和有限元结果正确地转换为实验结果，本文引入了转换函数。映射函数法(Mapping function method, MFM)是将分析和有限元结果转化为实验结果的有效方法。此外，纤维的行为是弹性的，不像基体的蠕变行为。此外，还解析地介绍了映射变换函数。最后，用映射函数法(MFM)预测短纤维复合材料的稳态蠕变行为，结果与以往的实验结果吻合较好。
{"title":"Determination of Exact Steady State Creep Behavior in Short Fiber Composites by Mapping Transformation Function (MTF) in MMC's","authors":"V. Monfared","doi":"10.5923/J.MATERIALS.20120202.07","DOIUrl":"https://doi.org/10.5923/J.MATERIALS.20120202.07","url":null,"abstract":"A novel mathematical model based on mapping function is presented for determination of exact steady state creep behaviour in short fiber metal matrix composites 6061Al/15%SiC (MMC's) subjected to axial loading. FEM and analytical steady state Creep behaviour of 6061Al/15%SiC (MMC's) composites wasn't coinciding to the previous experi- mental results in Prior researches. In this paper, transformation function is introduced in order to convert previous analytical and FEM results to experimental results correctly. Mapping function method (MFM) is exact approach for transformation of analytical and FEM results to experimental results in MMC's. Also, fiber behaviour is elastic unlike creep behaviour of matrix. In addition mapping transformation function is introduced analytically. Eventually, good agreement is established between the results of new mapping function method (MFM) and previous experimental results for prediction of steady state creep behaviour in short fiber composites (SFC's).","PeriodicalId":7420,"journal":{"name":"American Journal of Materials Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82906888","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 : 2012-08-31DOI: 10.5923/J.MATERIALS.20120202.05
R. Kaundal, A. Patnaik, A. Satapathy
This paper investigates the physical, impact behaviour and erosive wear properties of polyester composite materials reinforced with five different glass fibre loading (10, 20, 30, 40 and 50 wt.-%). Erosive wear property is studied under different impingement angles (30° to 90°), different impact velocities (43 m/s to 65 m/s) and dry silica sand particle (350 µm) is used as an erodent material. The results indicates that in case of erosive wear composite with 30 wt.-% of glass fiber contents shows better erosion resistance both in impingement angle and impact velocity effect as compare to the other composites. The physical properties and impact strength of the investigated composites found to be improving with fiber loading. At last the morphologies of eroded surface are examined by the scanning electron microscopy to investigate the nature of wear and material damage mode.
本文研究了五种不同玻璃纤维负荷(10、20、30、40和50 wt.-%)增强聚酯复合材料的物理、冲击性能和冲蚀磨损性能。研究了不同冲击角度(30°~ 90°)、不同冲击速度(43 m/s ~ 65 m/s)和干燥硅砂颗粒(350µm)作为冲蚀材料下的冲蚀磨损性能。结果表明，在冲蚀磨损情况下，玻璃纤维含量为30wt .-%的复合材料在冲击角和冲击速度效应方面都表现出较好的抗冲蚀性能。复合材料的物理性能和冲击强度随着纤维负荷的增加而提高。最后，利用扫描电镜对侵蚀面形貌进行了分析，研究了磨损的性质和材料的损伤模式。
{"title":"Solid Particle Erosion of Short Glass Fiber Reinforced Polyester Composite","authors":"R. Kaundal, A. Patnaik, A. Satapathy","doi":"10.5923/J.MATERIALS.20120202.05","DOIUrl":"https://doi.org/10.5923/J.MATERIALS.20120202.05","url":null,"abstract":"This paper investigates the physical, impact behaviour and erosive wear properties of polyester composite materials reinforced with five different glass fibre loading (10, 20, 30, 40 and 50 wt.-%). Erosive wear property is studied under different impingement angles (30° to 90°), different impact velocities (43 m/s to 65 m/s) and dry silica sand particle (350 µm) is used as an erodent material. The results indicates that in case of erosive wear composite with 30 wt.-% of glass fiber contents shows better erosion resistance both in impingement angle and impact velocity effect as compare to the other composites. The physical properties and impact strength of the investigated composites found to be improving with fiber loading. At last the morphologies of eroded surface are examined by the scanning electron microscopy to investigate the nature of wear and material damage mode.","PeriodicalId":7420,"journal":{"name":"American Journal of Materials Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83078364","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 : 2012-08-31DOI: 10.5923/J.MATERIALS.20120203.10
D. Goldie
The influence of ordered dipole regions upon hopping transport through dipolar glasses and molecularly doped polymers has been evaluated via Monte Carlo simulation. Ordered dipole regions were introduced as a set of randomly dis- tributed cubes throughout disordered dipolar lattices where the number and size of the cubes could be independently varied. Within each cube neighbouring dipoles were anti-aligned to minimise the local energetic disorder but the specific dipole orientation for each inserted cube was randomly selected. Whilst the underlying density of states appears to become ener- getically narrower as the overall proportion of disordered dipole sites is diluted by inserted ordered cubes this is not generally reflected in the associated transport properties. It is demonstrated that the lattice potential that is associated with background non-aligned dipoles in dipolar glasses have a controlling influence upon the observed macroscopic mobility. Confirmation of the importance of such non-aligned dipoles is provided by complimentary simulations using molecularly doped polymers where the dopant dipoles are agglomerated and ordered into cubic regions. The implication of the simulation results for the interpretation of experimental transport data in dipolar glasses and molecularly doped polymers is evaluated.
{"title":"The Sensitivity of Hopping Transport in Dipolar Glasses and Molecularly Doped Polymers to Localised Dipole Ordering","authors":"D. Goldie","doi":"10.5923/J.MATERIALS.20120203.10","DOIUrl":"https://doi.org/10.5923/J.MATERIALS.20120203.10","url":null,"abstract":"The influence of ordered dipole regions upon hopping transport through dipolar glasses and molecularly doped polymers has been evaluated via Monte Carlo simulation. Ordered dipole regions were introduced as a set of randomly dis- tributed cubes throughout disordered dipolar lattices where the number and size of the cubes could be independently varied. Within each cube neighbouring dipoles were anti-aligned to minimise the local energetic disorder but the specific dipole orientation for each inserted cube was randomly selected. Whilst the underlying density of states appears to become ener- getically narrower as the overall proportion of disordered dipole sites is diluted by inserted ordered cubes this is not generally reflected in the associated transport properties. It is demonstrated that the lattice potential that is associated with background non-aligned dipoles in dipolar glasses have a controlling influence upon the observed macroscopic mobility. Confirmation of the importance of such non-aligned dipoles is provided by complimentary simulations using molecularly doped polymers where the dopant dipoles are agglomerated and ordered into cubic regions. The implication of the simulation results for the interpretation of experimental transport data in dipolar glasses and molecularly doped polymers is evaluated.","PeriodicalId":7420,"journal":{"name":"American Journal of Materials Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89737216","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 : 2012-08-31DOI: 10.5923/J.MATERIALS.20110102.19
M. Sri̇vastava, A. Srinivasan, V. W. Grips
Ni-Co-ZrO2 nano-composites are electrodeposited from sulphamate electrolyte and a comparison is made with Ni-ZrO2 in terms of structure and properties. The Co content in the coatings is in the range of 10-80wt%. The deposition conditions like current density, pH are optimized in terms of microhardness and amounts of ZrO2 incorporated. The micro-hardness studies revealed that the maximum hardness is exhibited by Ni-28Co-2ZrO2 composite. The FESEM study showed a change in morphology from polyhedral to ridge with increase in Co content from 10 to 80wt%. A change in crystal structure from fcc to hcp is also seen. The effect of annealing treatment in terms of microhardness is studied by subjecting the com-posite electroforms to 800℃. The Co rich composite exhibited better stability compared to Ni rich composites. Ni-28Co-2ZrO2 composite exhibited better immersion corrosion resistance while, Ni-ZrO2 composite displayed better elec-trochemical corrosion resistance. The wear studies showed that Ni-10Co-2ZrO2, Ni-28Co-2ZrO2 composites showed better resistance. Thus, it is seen that the coatings can be tailored to suit various applications.
{"title":"Influence of Zirconia Incorporation on the Mechanical and Chemical Properties of Ni-Co Alloys","authors":"M. Sri̇vastava, A. Srinivasan, V. W. Grips","doi":"10.5923/J.MATERIALS.20110102.19","DOIUrl":"https://doi.org/10.5923/J.MATERIALS.20110102.19","url":null,"abstract":"Ni-Co-ZrO2 nano-composites are electrodeposited from sulphamate electrolyte and a comparison is made with Ni-ZrO2 in terms of structure and properties. The Co content in the coatings is in the range of 10-80wt%. The deposition conditions like current density, pH are optimized in terms of microhardness and amounts of ZrO2 incorporated. The micro-hardness studies revealed that the maximum hardness is exhibited by Ni-28Co-2ZrO2 composite. The FESEM study showed a change in morphology from polyhedral to ridge with increase in Co content from 10 to 80wt%. A change in crystal structure from fcc to hcp is also seen. The effect of annealing treatment in terms of microhardness is studied by subjecting the com-posite electroforms to 800℃. The Co rich composite exhibited better stability compared to Ni rich composites. Ni-28Co-2ZrO2 composite exhibited better immersion corrosion resistance while, Ni-ZrO2 composite displayed better elec-trochemical corrosion resistance. The wear studies showed that Ni-10Co-2ZrO2, Ni-28Co-2ZrO2 composites showed better resistance. Thus, it is seen that the coatings can be tailored to suit various applications.","PeriodicalId":7420,"journal":{"name":"American Journal of Materials Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73510998","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 : 2012-08-31DOI: 10.5923/J.MATERIALS.20120204.04
L. Borilo, L. Spivakova
Zirconia thin films with thicknesses of 40-120 nm on glass, single-crystal silicon, quartz, polycor, and sapphire substrates have been prepared from zirconium oxochloride and ethanol FFSs. The physicochemical processes involved in film formation and the phase composition and properties of the films have been studied. The films prepared on glass or quartz are amorphous; those on silicon, polycor, or sapphire have a crystal structure. The resulting ZrO2 films have refractive index indicator 1,86 – 2,08, are insulators, with high indicators of bandgap width 5,0 – 5,2 eV, absorption edge is limited by 220 nM, which allows to use it as reallot light covering.
{"title":"Synthesis and Characterization of ZrO 2 Thin Films","authors":"L. Borilo, L. Spivakova","doi":"10.5923/J.MATERIALS.20120204.04","DOIUrl":"https://doi.org/10.5923/J.MATERIALS.20120204.04","url":null,"abstract":"Zirconia thin films with thicknesses of 40-120 nm on glass, single-crystal silicon, quartz, polycor, and sapphire substrates have been prepared from zirconium oxochloride and ethanol FFSs. The physicochemical processes involved in film formation and the phase composition and properties of the films have been studied. The films prepared on glass or quartz are amorphous; those on silicon, polycor, or sapphire have a crystal structure. The resulting ZrO2 films have refractive index indicator 1,86 – 2,08, are insulators, with high indicators of bandgap width 5,0 – 5,2 eV, absorption edge is limited by 220 nM, which allows to use it as reallot light covering.","PeriodicalId":7420,"journal":{"name":"American Journal of Materials Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81330468","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 : 2012-08-31DOI: 10.5923/J.MATERIALS.20110102.22
T. Karpova, Victor Vassil, E. Vladimirova, V. Shur, V. A. Shikhova, V. Osotov, A. Nosov
The ferroelectric ceramic of the xBiScO3-(1-х)BaTiO3, x=0÷0.03 system was prepared by solid state reaction synthesis at temperatures below 850℃. Solid solutions with tetragonal symmetry were formed. Doping with BiScO3 resulted in linear increase with x the unit cell parameters, maximum temperature of the dielectric constant and its maximum value. Room temperature measurements of ferroelectric properties revealed more complicated behavior on doping with optimum combination of ferroelectric properties for composition with x = 0.015.
{"title":"Low Temperature Synthesis of the xBiScO 3 -(1-х)BaTiO 3 , x=0÷0.03 Ferroelectric System","authors":"T. Karpova, Victor Vassil, E. Vladimirova, V. Shur, V. A. Shikhova, V. Osotov, A. Nosov","doi":"10.5923/J.MATERIALS.20110102.22","DOIUrl":"https://doi.org/10.5923/J.MATERIALS.20110102.22","url":null,"abstract":"The ferroelectric ceramic of the xBiScO3-(1-х)BaTiO3, x=0÷0.03 system was prepared by solid state reaction synthesis at temperatures below 850℃. Solid solutions with tetragonal symmetry were formed. Doping with BiScO3 resulted in linear increase with x the unit cell parameters, maximum temperature of the dielectric constant and its maximum value. Room temperature measurements of ferroelectric properties revealed more complicated behavior on doping with optimum combination of ferroelectric properties for composition with x = 0.015.","PeriodicalId":7420,"journal":{"name":"American Journal of Materials Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83233418","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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