Pub Date : 2020-03-09DOI: 10.1504/ijnm.2020.10027475
Zhiguo Zhang, Yuxuan Sun
A new approach is proposed to calculate the master curve (MC) of glass. It can solve the problem: when the temperature is higher than Tt,l (defined later), the measured shear relaxation modulus cannot describe the mechanical response of the annealing stage during glass moulding press (GMP) through the thermal rheological simple (TRS) theory. Based on the temperature dependent Yang's modulus and TRS theory, the MC with a reference temperature less than Tt,l is calculated by an iterative process. In order to verify the suitability of MC at high temperature, the MC and shear relaxation moduli are used in the finite element (FE) simulation at the isothermal compression stage. Similar von Mises stresses are shown and the usability of the MC at moulding temperature is proved by the simulation results. In order to predict residual stress within the formed glass lens, the MC is used to conduct FE simulation for the whole GMP process.
{"title":"An approach to calculate master curve for glass moulding press based on finite element simulation","authors":"Zhiguo Zhang, Yuxuan Sun","doi":"10.1504/ijnm.2020.10027475","DOIUrl":"https://doi.org/10.1504/ijnm.2020.10027475","url":null,"abstract":"A new approach is proposed to calculate the master curve (MC) of glass. It can solve the problem: when the temperature is higher than Tt,l (defined later), the measured shear relaxation modulus cannot describe the mechanical response of the annealing stage during glass moulding press (GMP) through the thermal rheological simple (TRS) theory. Based on the temperature dependent Yang's modulus and TRS theory, the MC with a reference temperature less than Tt,l is calculated by an iterative process. In order to verify the suitability of MC at high temperature, the MC and shear relaxation moduli are used in the finite element (FE) simulation at the isothermal compression stage. Similar von Mises stresses are shown and the usability of the MC at moulding temperature is proved by the simulation results. In order to predict residual stress within the formed glass lens, the MC is used to conduct FE simulation for the whole GMP process.","PeriodicalId":14170,"journal":{"name":"International Journal of Nanomanufacturing","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49098426","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 : 2020-03-09DOI: 10.1504/ijnm.2020.10027476
Qi Zhang, Xin Ma, M. Guo, Lei Yang, Yulong Zhao
In this study, a new type of thermistor temperature sensor was developed. The sensing materials was amorphous carbon (a-C) film prepared using electron cyclotron resonance (ECR) plasma processing system under low energy electron irradiation sputtering. The nanostructure of a-C film was observed by transmission electron microscope (TEM), the atomic bonding and carbon hybridisation condition was analysed by Raman spectra and X-ray photoelectron spectroscopy (XPS), respectively. The linearity of temperature-resistance curve of this kind of a-C film was very good in certain temperature range, with high temperature coefficient of resistance (TCR). The a-C film by 50 eV electron irradiation can measure larger temperature range from –75°C to 155°C, with good repeatability. The working temperature range of a-C film by 100 eV electron irradiation was much smaller, but TCR absolute value of this film was higher. It can be concluded that the lower sp2/sp3, the better linearity of temperature-resistance curve, the lower TCR absolute value in certain working temperature range. The research shows that this kind of a-C film temperature sensor has good linearity and repeatability; also it can be integrated with other MEMS sensor simply.
{"title":"Study on novel temperature sensor based on amorphous carbon film","authors":"Qi Zhang, Xin Ma, M. Guo, Lei Yang, Yulong Zhao","doi":"10.1504/ijnm.2020.10027476","DOIUrl":"https://doi.org/10.1504/ijnm.2020.10027476","url":null,"abstract":"In this study, a new type of thermistor temperature sensor was developed. The sensing materials was amorphous carbon (a-C) film prepared using electron cyclotron resonance (ECR) plasma processing system under low energy electron irradiation sputtering. The nanostructure of a-C film was observed by transmission electron microscope (TEM), the atomic bonding and carbon hybridisation condition was analysed by Raman spectra and X-ray photoelectron spectroscopy (XPS), respectively. The linearity of temperature-resistance curve of this kind of a-C film was very good in certain temperature range, with high temperature coefficient of resistance (TCR). The a-C film by 50 eV electron irradiation can measure larger temperature range from –75°C to 155°C, with good repeatability. The working temperature range of a-C film by 100 eV electron irradiation was much smaller, but TCR absolute value of this film was higher. It can be concluded that the lower sp2/sp3, the better linearity of temperature-resistance curve, the lower TCR absolute value in certain working temperature range. The research shows that this kind of a-C film temperature sensor has good linearity and repeatability; also it can be integrated with other MEMS sensor simply.","PeriodicalId":14170,"journal":{"name":"International Journal of Nanomanufacturing","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45139551","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 : 2020-03-09DOI: 10.1504/ijnm.2020.10026018
P. Prince, N. M. Sivamangai
Static random access memory is popularly used in the cache memories due to its infinite and very fast read/write operations. As technology advances, size of devices shrinks and the percent of manufacturing defects in integrated circuits increases significantly which results in different types of faults. The most crucial part regarding testing is achieving maximum fault coverage with minimal test time. March SR+ is one of the test used frequently in the industry, which has a higher percentage of fault detection with a test length of 18N. In this paper, we propose a novel technique to minimise the test time of March SR+. On this basis, we introduce a more efficient alternative to March SR+. The reformulation of March SR+ is essentially based on introducing a particular addressing sequence and read/write data sequence. This modification does not alter the capability of March SR+ to detect the former target faults, but extends the ability of many conventional March-based test solutions in detecting dynamic read destructive faults without any test modification. Moreover, fault detection using the proposed methodology results in a significant reduction of 11.1% in test time and 11.04% in average power consumption.
{"title":"A Novel Technique for Minimization of March Test Using Read Equivalent Stress","authors":"P. Prince, N. M. Sivamangai","doi":"10.1504/ijnm.2020.10026018","DOIUrl":"https://doi.org/10.1504/ijnm.2020.10026018","url":null,"abstract":"Static random access memory is popularly used in the cache memories due to its infinite and very fast read/write operations. As technology advances, size of devices shrinks and the percent of manufacturing defects in integrated circuits increases significantly which results in different types of faults. The most crucial part regarding testing is achieving maximum fault coverage with minimal test time. March SR+ is one of the test used frequently in the industry, which has a higher percentage of fault detection with a test length of 18N. In this paper, we propose a novel technique to minimise the test time of March SR+. On this basis, we introduce a more efficient alternative to March SR+. The reformulation of March SR+ is essentially based on introducing a particular addressing sequence and read/write data sequence. This modification does not alter the capability of March SR+ to detect the former target faults, but extends the ability of many conventional March-based test solutions in detecting dynamic read destructive faults without any test modification. Moreover, fault detection using the proposed methodology results in a significant reduction of 11.1% in test time and 11.04% in average power consumption.","PeriodicalId":14170,"journal":{"name":"International Journal of Nanomanufacturing","volume":"16 1","pages":"184"},"PeriodicalIF":0.0,"publicationDate":"2020-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43828543","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 : 2020-01-14DOI: 10.1504/ijnm.2020.10025908
P. Setyopratomo, P. P. Wulan, M. Sudibandriyo
MgO supported tri-metallic catalyst containing combination of transition metals Fe, Co, and Mo was used to synthesise carbon nanotubes (CNT) from liquefied petroleum gas by chemical vapour deposition (CVD) method. The effect of reaction temperature, reaction time and catalyst weight to the yield and the CNT properties was investigated. It found that the CNT yield increased with increasing the reaction temperature. Besides, increasing the reaction temperature lead to the increase of the diameter and wall thickness of the CNT. Moreover, it was found that the crystallinity of the synthesised CNT increase when the reaction temperature is raised. The meso pores dominate the pore structure of the CNT product and contribute around 90% of the total pores volume. Meanwhile, micro pores with pore size range around 0.3–0.4 nm dominate the micro pores and contribute approximately 50–60% of the total micro pores volume. It also found that the CNT yield is decreased along with the increasing catalyst weight.
{"title":"Carbon nanotubes synthesis using Fe-Co-Mo/MgO tri-metallic catalyst: study the effect of reaction temperature, reaction time and catalyst weight","authors":"P. Setyopratomo, P. P. Wulan, M. Sudibandriyo","doi":"10.1504/ijnm.2020.10025908","DOIUrl":"https://doi.org/10.1504/ijnm.2020.10025908","url":null,"abstract":"MgO supported tri-metallic catalyst containing combination of transition metals Fe, Co, and Mo was used to synthesise carbon nanotubes (CNT) from liquefied petroleum gas by chemical vapour deposition (CVD) method. The effect of reaction temperature, reaction time and catalyst weight to the yield and the CNT properties was investigated. It found that the CNT yield increased with increasing the reaction temperature. Besides, increasing the reaction temperature lead to the increase of the diameter and wall thickness of the CNT. Moreover, it was found that the crystallinity of the synthesised CNT increase when the reaction temperature is raised. The meso pores dominate the pore structure of the CNT product and contribute around 90% of the total pores volume. Meanwhile, micro pores with pore size range around 0.3–0.4 nm dominate the micro pores and contribute approximately 50–60% of the total micro pores volume. It also found that the CNT yield is decreased along with the increasing catalyst weight.","PeriodicalId":14170,"journal":{"name":"International Journal of Nanomanufacturing","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44563657","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 : 2019-12-19DOI: 10.1504/IJNM.2019.10017383
Z. Kowal, J. Jedrzejewski, Taeweon Gim
This paper presents an FEM model of a feed drive with a ball screw stiffness-wise, thermally and motion-wise integrated with the machine tool structure. The model takes into account the moving heat sources, the frictional and inertial interaction of the masses being shifted and the variable thermoelastic and stiffness interactions within the drive and the machine tool load-bearing structure. The results of heating up and displacement calculations for the ball screw, the bearing supports and the whole machine tool are analysed with regard to positioning accuracy.
{"title":"Precision of prestressed ball screw thermal behaviour in machine tool operating conditions","authors":"Z. Kowal, J. Jedrzejewski, Taeweon Gim","doi":"10.1504/IJNM.2019.10017383","DOIUrl":"https://doi.org/10.1504/IJNM.2019.10017383","url":null,"abstract":"This paper presents an FEM model of a feed drive with a ball screw stiffness-wise, thermally and motion-wise integrated with the machine tool structure. The model takes into account the moving heat sources, the frictional and inertial interaction of the masses being shifted and the variable thermoelastic and stiffness interactions within the drive and the machine tool load-bearing structure. The results of heating up and displacement calculations for the ball screw, the bearing supports and the whole machine tool are analysed with regard to positioning accuracy.","PeriodicalId":14170,"journal":{"name":"International Journal of Nanomanufacturing","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42280971","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 : 2019-08-27DOI: 10.1504/ijnm.2019.10023468
B. Lin, Zehua Hu
In this paper, a new machine tool material is put forward where PTFE resin is chosen as the matrix material for its properties of good acid and alkali corrosion resistance. High purity quartz and alumina ceramic microsphere are selected as the aggregates; nano-alumina and hollow glass microsphere are selected as the fillers. First, the aggregate gradation is analysed. Then, Young's modulus and sound attenuation coefficient are predicted in theory. Nonlinear regression analysis is conducted by support vector machine (SVM). 2D and 3D irregular polygons aggregate particles packing model is set up by MATLAB and the properties of the packing model are simulated by finite element analysis. Finally, several vibration experiments are conducted. The analysis results show that the chosen filler and aggregate can improve the stiffness and vibration characteristics of the material, which has a guiding significance to the machinery manufacturing industry.
{"title":"The material design and property research of a novel machine tool material","authors":"B. Lin, Zehua Hu","doi":"10.1504/ijnm.2019.10023468","DOIUrl":"https://doi.org/10.1504/ijnm.2019.10023468","url":null,"abstract":"In this paper, a new machine tool material is put forward where PTFE resin is chosen as the matrix material for its properties of good acid and alkali corrosion resistance. High purity quartz and alumina ceramic microsphere are selected as the aggregates; nano-alumina and hollow glass microsphere are selected as the fillers. First, the aggregate gradation is analysed. Then, Young's modulus and sound attenuation coefficient are predicted in theory. Nonlinear regression analysis is conducted by support vector machine (SVM). 2D and 3D irregular polygons aggregate particles packing model is set up by MATLAB and the properties of the packing model are simulated by finite element analysis. Finally, several vibration experiments are conducted. The analysis results show that the chosen filler and aggregate can improve the stiffness and vibration characteristics of the material, which has a guiding significance to the machinery manufacturing industry.","PeriodicalId":14170,"journal":{"name":"International Journal of Nanomanufacturing","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45017119","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}
Surface matching technique is the base of three-dimension surface error separation, which plays an important role in error compensation of ultra-precision manufacturing and automatic feedback control system. Surface error and surface roughness are key indicators for the evaluation of the quality of optical elements ultra-precision manufacturing. There are variations between the measured data and the actual surface data due to clamped positioning errors. Therefore, it is difficult to improve the manufacturing precision by error compensation based on evaluating the deviation between the measured data and the theoretical surface data directly. So we proposed an error separation technique based on surface matching, which can match the surface generated by fitting the measured data with the theoretical surface. And then we can obtain the spatial transformation parameters between measured surface and the actual surface using genetic algorithm (GA) for optimising. Finally we can separate the spatial errors resulting from the clamped positioning errors of the measurement, and the actual measured surface errors are got.
{"title":"An error separation method based on surface matching in large aspheric measurement","authors":"Lin Sun, Shuming Yang, Peng-Zhan Wu, Changsheng Li, Qijing Lin, Zhuangde Jiang","doi":"10.1504/ijnm.2019.10023464","DOIUrl":"https://doi.org/10.1504/ijnm.2019.10023464","url":null,"abstract":"Surface matching technique is the base of three-dimension surface error separation, which plays an important role in error compensation of ultra-precision manufacturing and automatic feedback control system. Surface error and surface roughness are key indicators for the evaluation of the quality of optical elements ultra-precision manufacturing. There are variations between the measured data and the actual surface data due to clamped positioning errors. Therefore, it is difficult to improve the manufacturing precision by error compensation based on evaluating the deviation between the measured data and the theoretical surface data directly. So we proposed an error separation technique based on surface matching, which can match the surface generated by fitting the measured data with the theoretical surface. And then we can obtain the spatial transformation parameters between measured surface and the actual surface using genetic algorithm (GA) for optimising. Finally we can separate the spatial errors resulting from the clamped positioning errors of the measurement, and the actual measured surface errors are got.","PeriodicalId":14170,"journal":{"name":"International Journal of Nanomanufacturing","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49641507","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 : 2019-08-27DOI: 10.1504/ijnm.2019.10023466
Yaonan Cheng, Li Liu, Lu Zhenzhen, R. Guan, Tong Wang
Heavy cutting is the main machining way for high-end equipment and the high temperature generated from the cutting process largely influences on the machining and tool life. Firstly, the main cutting area where energy was converted into cutting heat and the approximate rectangular distribution of cutting temperature were received through finite element simulation of heavy cutting difficult-to-machine materials and the finite element simulation provided fundamental basis for temperature distribution mathematical model. Then, heavy cutting characteristics and Jaeger moving heat source theory were combined to calculate the average temperature of shearing surface and rake face of the cutting tool. Finally, temperature distribution mathematical model in tool-chip contact area for heavy cutting difficult-to-machine materials was established using Kelren theory. The results show that the established mathematical model are consistent with experiment results and the model provides theoretical basis for quantitative analysis of heavy cutting temperature, the optimisation of cutting parameters and heavy cutting tool design.
{"title":"Research on temperature distribution mathematical model of cutting tool during heavy cutting difficult-to-machine materials","authors":"Yaonan Cheng, Li Liu, Lu Zhenzhen, R. Guan, Tong Wang","doi":"10.1504/ijnm.2019.10023466","DOIUrl":"https://doi.org/10.1504/ijnm.2019.10023466","url":null,"abstract":"Heavy cutting is the main machining way for high-end equipment and the high temperature generated from the cutting process largely influences on the machining and tool life. Firstly, the main cutting area where energy was converted into cutting heat and the approximate rectangular distribution of cutting temperature were received through finite element simulation of heavy cutting difficult-to-machine materials and the finite element simulation provided fundamental basis for temperature distribution mathematical model. Then, heavy cutting characteristics and Jaeger moving heat source theory were combined to calculate the average temperature of shearing surface and rake face of the cutting tool. Finally, temperature distribution mathematical model in tool-chip contact area for heavy cutting difficult-to-machine materials was established using Kelren theory. The results show that the established mathematical model are consistent with experiment results and the model provides theoretical basis for quantitative analysis of heavy cutting temperature, the optimisation of cutting parameters and heavy cutting tool design.","PeriodicalId":14170,"journal":{"name":"International Journal of Nanomanufacturing","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46837965","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 : 2019-08-27DOI: 10.1504/ijnm.2019.10023467
X. Zhao, Chengjin Zhang, Hongbo Liu
In this study, a fractional-order composite controller is proposed to decrease the settling time and narrow the range of the transient creep of a piezoelectric actuator. The controller is composed of backlash modules and a fractional-order PIλ controller. The backlash modules reduce the effect of the transient creep and the hysteresis, while the fractional-order controller decreases the settling time. Experiments show that the settling time is decreased from 11 ms to 6 ms. The controller exhibits good performance on step creep and hysteresis when the input signal is discretised into steps, whether 10, 20, 40 or 80 steps. All standard deviations are suppressed to levels 39.3% lower than that of a standard PI controller and the range of the transient creep is reduced to 19.46%.
{"title":"Fractional-order composite control for the transient creep of a piezoelectric actuator","authors":"X. Zhao, Chengjin Zhang, Hongbo Liu","doi":"10.1504/ijnm.2019.10023467","DOIUrl":"https://doi.org/10.1504/ijnm.2019.10023467","url":null,"abstract":"In this study, a fractional-order composite controller is proposed to decrease the settling time and narrow the range of the transient creep of a piezoelectric actuator. The controller is composed of backlash modules and a fractional-order PIλ controller. The backlash modules reduce the effect of the transient creep and the hysteresis, while the fractional-order controller decreases the settling time. Experiments show that the settling time is decreased from 11 ms to 6 ms. The controller exhibits good performance on step creep and hysteresis when the input signal is discretised into steps, whether 10, 20, 40 or 80 steps. All standard deviations are suppressed to levels 39.3% lower than that of a standard PI controller and the range of the transient creep is reduced to 19.46%.","PeriodicalId":14170,"journal":{"name":"International Journal of Nanomanufacturing","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44745757","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 : 2019-08-27DOI: 10.1504/ijnm.2019.10023465
H. Niu, Guangde Chen, Youzhang Zhu, Yelong Wu, H. Ye
By using the Berry phase method, influence of oxygen vacancy (Vo) on the polarisation property of ZnO has been investigated. Calculated results indicate that the spontaneous polarisation, the piezoelectric constants e31 and e33 are very sensitive to the concentration and distribution of Vo. The absolute values of them decrease nonlinearly as Vo concentration increases. At the same concentration, non-uniform distribution of Vo is favoured in energy, and can enhance the impact on spontaneous polarisation and e31. 1.56% Vo-Vo complex can even reverse the orientation of the spontaneous polarisation, while the case for e33 is opposite, the influence is weakened. These findings suggest that the polarisation property of ZnO might be adjusted by controlling the point defects.
{"title":"Influence of oxygen vacancies on the spontaneous polarisation and piezoelectricity of ZnO: a first-principles study","authors":"H. Niu, Guangde Chen, Youzhang Zhu, Yelong Wu, H. Ye","doi":"10.1504/ijnm.2019.10023465","DOIUrl":"https://doi.org/10.1504/ijnm.2019.10023465","url":null,"abstract":"By using the Berry phase method, influence of oxygen vacancy (Vo) on the polarisation property of ZnO has been investigated. Calculated results indicate that the spontaneous polarisation, the piezoelectric constants e31 and e33 are very sensitive to the concentration and distribution of Vo. The absolute values of them decrease nonlinearly as Vo concentration increases. At the same concentration, non-uniform distribution of Vo is favoured in energy, and can enhance the impact on spontaneous polarisation and e31. 1.56% Vo-Vo complex can even reverse the orientation of the spontaneous polarisation, while the case for e33 is opposite, the influence is weakened. These findings suggest that the polarisation property of ZnO might be adjusted by controlling the point defects.","PeriodicalId":14170,"journal":{"name":"International Journal of Nanomanufacturing","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41850357","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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