Pub Date : 2017-05-04DOI: 10.1080/07315171.2017.1320192
A. Nautiyal
ABSTRACT The ferroelectric properties of sodium doped cesium nitrate (Cs1−xNaxNO3) - polymer composite films have been studied. The composite film of Cs1−xNaxNO3: PVA with doping concentration x = 13.6% prepared by spray deposition method at substrate temperature Ts = 200°C shows optimum value of remanent polarization and polarization current. The improved properties have been attributed to high structural distortion.
{"title":"Ferroelectric properties of sodium doped cesium nitrate - polymer composite films","authors":"A. Nautiyal","doi":"10.1080/07315171.2017.1320192","DOIUrl":"https://doi.org/10.1080/07315171.2017.1320192","url":null,"abstract":"ABSTRACT The ferroelectric properties of sodium doped cesium nitrate (Cs1−xNaxNO3) - polymer composite films have been studied. The composite film of Cs1−xNaxNO3: PVA with doping concentration x = 13.6% prepared by spray deposition method at substrate temperature Ts = 200°C shows optimum value of remanent polarization and polarization current. The improved properties have been attributed to high structural distortion.","PeriodicalId":50451,"journal":{"name":"Ferroelectrics Letters Section","volume":"16 1","pages":"29 - 34"},"PeriodicalIF":0.4,"publicationDate":"2017-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78148258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-05-04DOI: 10.1080/07315171.2017.1319748
Yong-Jin Kim, J. Yoo, Jie-Young Lee
ABSTRACT In this study, in order to develop the composition ceramics for ultrasonic sensor application, Pb0.985Bi0.01(Co1/2W1/2)0.03(Ni1/3Nb2/3)0.09(ZrxTi1-x)0.88O3+0.25wt% CuO (abbreviated as PCW-PNN-PZT) system ceramics were prepared with the variations of x and then their phase microstructure, piezoelectric and dielectric characteristics were investigated with the variations of x. The compositions near the morphotropic phase boundary (MPB) appeared when x = 0.495. Moreover, the PCW-PNN-PZT ceramics could be sintered at low temperature of 920°C by adding sintering aids CuO. At sintering temperature of 920°C and x = 0.495 specimen, the density (ρ), electromechanical coupling factor(kp), dielectric constant (ϵr), mechanical quality (Qm) and piezoelectric constant (d33) piezoelectric figure of merit (d33·g33) indicated the optimal value of 7.94 g/cm3. 0.65, 1959, 356, 486 pC/N, and 15.56 [pm2/N], respectively, suitable for ultrasonic sensor application. The CuO was proved to lower the sintering temperature of piezoelectric ceramics due to the effects of PbO and CuO liquid phase.
{"title":"Piezoelectric properties of PCW-PNN-PZT ceramics sintered at low temperature","authors":"Yong-Jin Kim, J. Yoo, Jie-Young Lee","doi":"10.1080/07315171.2017.1319748","DOIUrl":"https://doi.org/10.1080/07315171.2017.1319748","url":null,"abstract":"ABSTRACT In this study, in order to develop the composition ceramics for ultrasonic sensor application, Pb0.985Bi0.01(Co1/2W1/2)0.03(Ni1/3Nb2/3)0.09(ZrxTi1-x)0.88O3+0.25wt% CuO (abbreviated as PCW-PNN-PZT) system ceramics were prepared with the variations of x and then their phase microstructure, piezoelectric and dielectric characteristics were investigated with the variations of x. The compositions near the morphotropic phase boundary (MPB) appeared when x = 0.495. Moreover, the PCW-PNN-PZT ceramics could be sintered at low temperature of 920°C by adding sintering aids CuO. At sintering temperature of 920°C and x = 0.495 specimen, the density (ρ), electromechanical coupling factor(kp), dielectric constant (ϵr), mechanical quality (Qm) and piezoelectric constant (d33) piezoelectric figure of merit (d33·g33) indicated the optimal value of 7.94 g/cm3. 0.65, 1959, 356, 486 pC/N, and 15.56 [pm2/N], respectively, suitable for ultrasonic sensor application. The CuO was proved to lower the sintering temperature of piezoelectric ceramics due to the effects of PbO and CuO liquid phase.","PeriodicalId":50451,"journal":{"name":"Ferroelectrics Letters Section","volume":"1 1","pages":"1 - 7"},"PeriodicalIF":0.4,"publicationDate":"2017-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86522186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-05-04DOI: 10.1080/07315171.2017.1320493
L. Changshi
ABSTRACT In this paper, a very simple methodology to characterize the polarization of ferroelectrics via electrical field is proposed. This methodology allows us to use not only experimental electrical field-polarization curve as classical models do, but also physical status of ferroelectrics. The methodology is based on the use of Fermi-Dirac distribution, from eight measured P–E curves of two ferroelectrics materials, the theoretical polarization-electrical field curve repeat experimental path very well. Meanwhile, the effects of physical status on ferroelectric hysteresis loop are explained through mathematical route.
{"title":"Calculation ferroelectric hysteresis loop via an explicit function","authors":"L. Changshi","doi":"10.1080/07315171.2017.1320493","DOIUrl":"https://doi.org/10.1080/07315171.2017.1320493","url":null,"abstract":"ABSTRACT In this paper, a very simple methodology to characterize the polarization of ferroelectrics via electrical field is proposed. This methodology allows us to use not only experimental electrical field-polarization curve as classical models do, but also physical status of ferroelectrics. The methodology is based on the use of Fermi-Dirac distribution, from eight measured P–E curves of two ferroelectrics materials, the theoretical polarization-electrical field curve repeat experimental path very well. Meanwhile, the effects of physical status on ferroelectric hysteresis loop are explained through mathematical route.","PeriodicalId":50451,"journal":{"name":"Ferroelectrics Letters Section","volume":"59 1","pages":"49 - 57"},"PeriodicalIF":0.4,"publicationDate":"2017-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86963213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-05-04DOI: 10.1080/07315171.2017.1320194
M. Vaish, Manish Sharma, R. Vaish, V. Chauhan
ABSTRACT The field of waste thermal energy harvesting has experienced significant growth over the past few years. This paper presents an experimental study on thermal radiation to electrical energy conversion using pyroelectric material (PbZrxTi1-xO3 (PZT-5H)). Pyroelectric material was exposed to UV lamp with a constant frequency of 0.5 Hz and another surface of sample was continuously cooled via natural air fan (for generation continuous temporal gradient in material). Maximum value of stored energy was 1.75 µJ across 100 µF without load resistance. Maximum power output was found to be 0.76 µW across load resistance of 3 MΩ and 10 µF.
{"title":"Harvesting thermal energy (via radiation) using pyroelectric materials (PZT-5H): An experimental study","authors":"M. Vaish, Manish Sharma, R. Vaish, V. Chauhan","doi":"10.1080/07315171.2017.1320194","DOIUrl":"https://doi.org/10.1080/07315171.2017.1320194","url":null,"abstract":"ABSTRACT The field of waste thermal energy harvesting has experienced significant growth over the past few years. This paper presents an experimental study on thermal radiation to electrical energy conversion using pyroelectric material (PbZrxTi1-xO3 (PZT-5H)). Pyroelectric material was exposed to UV lamp with a constant frequency of 0.5 Hz and another surface of sample was continuously cooled via natural air fan (for generation continuous temporal gradient in material). Maximum value of stored energy was 1.75 µJ across 100 µF without load resistance. Maximum power output was found to be 0.76 µW across load resistance of 3 MΩ and 10 µF.","PeriodicalId":50451,"journal":{"name":"Ferroelectrics Letters Section","volume":"21 1","pages":"35 - 41"},"PeriodicalIF":0.4,"publicationDate":"2017-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79238259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-05-04DOI: 10.1080/07315171.2017.1320502
Chao Zhong, Likun Wang, L. Qin, B. Yu
ABSTRACT The bandwidth of composite transducer was successfully expanded via matching layer design. Firstly, the admittance equation of transducer was deduced through combining the equivalent model of 1–3 piezoelectric composite with the electromechanical equivalent circuit of piezoelectric crystal thickness vibration. Then, the relations between bandwidth and the parameters of matching layer were summarized by the conductance curves. Finally, a composite transducer with matching layer was designed and fabricated. Experimental results show that the bandwidth reaches to 56 kHz and the mechanical quality factor Q drops to 1.8. The results are in agreement with the theoretical calculation.
{"title":"Expand bandwidth of composite transducer via matching layer design","authors":"Chao Zhong, Likun Wang, L. Qin, B. Yu","doi":"10.1080/07315171.2017.1320502","DOIUrl":"https://doi.org/10.1080/07315171.2017.1320502","url":null,"abstract":"ABSTRACT The bandwidth of composite transducer was successfully expanded via matching layer design. Firstly, the admittance equation of transducer was deduced through combining the equivalent model of 1–3 piezoelectric composite with the electromechanical equivalent circuit of piezoelectric crystal thickness vibration. Then, the relations between bandwidth and the parameters of matching layer were summarized by the conductance curves. Finally, a composite transducer with matching layer was designed and fabricated. Experimental results show that the bandwidth reaches to 56 kHz and the mechanical quality factor Q drops to 1.8. The results are in agreement with the theoretical calculation.","PeriodicalId":50451,"journal":{"name":"Ferroelectrics Letters Section","volume":"22 1","pages":"58 - 64"},"PeriodicalIF":0.4,"publicationDate":"2017-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72722680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-05-04DOI: 10.1080/07315171.2017.1256109
Monali R. Kadukara, P. W. Yawalkarb, S. P. Lochabc, S. J. Dhoblea, Sudhakar Reddyd, Deborah J. Taylor
ABSTRACT In the present article, polycrystalline low Z (Zeff = 8.19) LiAlO2:Dy/Eu phosphor prepared by simple wet chemical method. Thermoluminescence and some of the dosimetric characteristics of Dy/Eu activated LiAlO2 were reported. Samples in powder form were exposed to γ-ray irradiation with 137 Cs source for both LiAlO2:Dy and LiAlO2:Eu phosphors were studied for the first time. In case of LiAlO2:Dy phosphor shows one peak at 287°C and small hump at 335°C. However; LiAlO2:Eu phosphor shows glow peak at 272°C with a shoulder peak around 329°C. The TL sensitivity in both the cases were compared with CaSO4:Dy phosphor.LiAlO2:Dy sample have shown 1.23 times less sensitive than CaSO4:Dy and for LiAlO2:Eu is 5.6 times less sensitive than CaSO4:Dy.The TL response in the 0.001-0.043Gy dose range increased linearly with increase in radiation dose for both the samples. Fading study has been also done for both the samples. In addition to this trap parameters of LiAlO2:Dy/Eu were calculated by using computerized glow curve deconvolution and Chen's peak shape method.
{"title":"Thermoluminescence and kinetic study of low z LiAlO2:Dy/Eu phosphors","authors":"Monali R. Kadukara, P. W. Yawalkarb, S. P. Lochabc, S. J. Dhoblea, Sudhakar Reddyd, Deborah J. Taylor","doi":"10.1080/07315171.2017.1256109","DOIUrl":"https://doi.org/10.1080/07315171.2017.1256109","url":null,"abstract":"ABSTRACT In the present article, polycrystalline low Z (Zeff = 8.19) LiAlO2:Dy/Eu phosphor prepared by simple wet chemical method. Thermoluminescence and some of the dosimetric characteristics of Dy/Eu activated LiAlO2 were reported. Samples in powder form were exposed to γ-ray irradiation with 137 Cs source for both LiAlO2:Dy and LiAlO2:Eu phosphors were studied for the first time. In case of LiAlO2:Dy phosphor shows one peak at 287°C and small hump at 335°C. However; LiAlO2:Eu phosphor shows glow peak at 272°C with a shoulder peak around 329°C. The TL sensitivity in both the cases were compared with CaSO4:Dy phosphor.LiAlO2:Dy sample have shown 1.23 times less sensitive than CaSO4:Dy and for LiAlO2:Eu is 5.6 times less sensitive than CaSO4:Dy.The TL response in the 0.001-0.043Gy dose range increased linearly with increase in radiation dose for both the samples. Fading study has been also done for both the samples. In addition to this trap parameters of LiAlO2:Dy/Eu were calculated by using computerized glow curve deconvolution and Chen's peak shape method.","PeriodicalId":50451,"journal":{"name":"Ferroelectrics Letters Section","volume":"5 1","pages":"17 - 8"},"PeriodicalIF":0.4,"publicationDate":"2017-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80999570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-05-26DOI: 10.1080/07315171.2016.1173983
Swati Anoop Fartode, B. Reddy, V. Nayar, S. Dhoble
ABSTRACT This paper reports on the BaSi6N8O:Eu3+ phosphor were prepared via modified two steps solid state diffusion technique in open air atmosphere and material was quenched at 1200°C for four hours. Eu3+ activated BaSi6N8O phosphor was characterized by XRD, which confirms the formation of the sample. From the Scanning electron microscope (SEM) images, the surface morphology of the sample has been studied. The photoluminescence (PL) spectra of BaSi6N8O:Eu3+ phosphor exhibits two emission bands at 614 nm (5D0→7F2) and at 587 nm (5D0→7F1) with an excitation wavelength of 396 nm. From the FTIR spectrum, bonding of atoms to each other and vibrational motions of molecules has been studied. ML was studied by dropping a piston on irradiated sample. From the ML glow curves single peak has been observed. ML intensity increases with activator concentration. Optimum ML has been observed for the sample having 1mole % of Eu ions.
{"title":"Luminescence studies on BaSi6N8O: Eu3+ phosphors","authors":"Swati Anoop Fartode, B. Reddy, V. Nayar, S. Dhoble","doi":"10.1080/07315171.2016.1173983","DOIUrl":"https://doi.org/10.1080/07315171.2016.1173983","url":null,"abstract":"ABSTRACT This paper reports on the BaSi6N8O:Eu3+ phosphor were prepared via modified two steps solid state diffusion technique in open air atmosphere and material was quenched at 1200°C for four hours. Eu3+ activated BaSi6N8O phosphor was characterized by XRD, which confirms the formation of the sample. From the Scanning electron microscope (SEM) images, the surface morphology of the sample has been studied. The photoluminescence (PL) spectra of BaSi6N8O:Eu3+ phosphor exhibits two emission bands at 614 nm (5D0→7F2) and at 587 nm (5D0→7F1) with an excitation wavelength of 396 nm. From the FTIR spectrum, bonding of atoms to each other and vibrational motions of molecules has been studied. ML was studied by dropping a piston on irradiated sample. From the ML glow curves single peak has been observed. ML intensity increases with activator concentration. Optimum ML has been observed for the sample having 1mole % of Eu ions.","PeriodicalId":50451,"journal":{"name":"Ferroelectrics Letters Section","volume":"92 1","pages":"34 - 51"},"PeriodicalIF":0.4,"publicationDate":"2016-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76792060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-05-26DOI: 10.1080/07315171.2016.1174002
M. Vaish, N. A. Madhar, B. Ilahi, V. Chauhan, R. Vaish
Abstract Pyroelectric materials can be used for energy harvesting in integrated Micro-Electro-Mechanical-Systems (MEMS) and low power electronics devices. This paper considers the thermal energy harvesting using Ca0.15(Sr0.5Ba0.5)0.85Nb2O5 (CSBN) pyroelectric ceramics. Hot/cold air was used to generate a continuous temporal temperature profile on the material surfaces. The maximum open circuit voltage was observed as 0.26V. The maximum stored energy was 1.9 μJ in 47 μF capacitor (without load resistance). The maximum power was found to be 2.07nW across 3 MΩ and 47 μF.
{"title":"An experimental study on thermal energy harvesting using Ca0.15(Sr0.5Ba0.5)0.85Nb2O5 pyroelectric ceramics","authors":"M. Vaish, N. A. Madhar, B. Ilahi, V. Chauhan, R. Vaish","doi":"10.1080/07315171.2016.1174002","DOIUrl":"https://doi.org/10.1080/07315171.2016.1174002","url":null,"abstract":"Abstract Pyroelectric materials can be used for energy harvesting in integrated Micro-Electro-Mechanical-Systems (MEMS) and low power electronics devices. This paper considers the thermal energy harvesting using Ca0.15(Sr0.5Ba0.5)0.85Nb2O5 (CSBN) pyroelectric ceramics. Hot/cold air was used to generate a continuous temporal temperature profile on the material surfaces. The maximum open circuit voltage was observed as 0.26V. The maximum stored energy was 1.9 μJ in 47 μF capacitor (without load resistance). The maximum power was found to be 2.07nW across 3 MΩ and 47 μF.","PeriodicalId":50451,"journal":{"name":"Ferroelectrics Letters Section","volume":"48 1","pages":"52 - 58"},"PeriodicalIF":0.4,"publicationDate":"2016-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75326965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-05-26DOI: 10.1080/07315171.2016.1171116
S. Ai, Shao-yin Zhang, Huai-tang Chen, Shao-hua Shi, Chuan-sheng Xu
ABSTRACT The classical explanation of the shielding charges at the surface of a ferroelectric was looked back at first. Then based on the non-equilibrium (or irreversible) thermodynamic description of ferroelectric phase transitions, a new explanation of that was given out. They agree with each other. In particular, the former is a special case of the latter.
{"title":"A discussion: Why do the free, shielding charges really exist at the surface of a ferroelectric?","authors":"S. Ai, Shao-yin Zhang, Huai-tang Chen, Shao-hua Shi, Chuan-sheng Xu","doi":"10.1080/07315171.2016.1171116","DOIUrl":"https://doi.org/10.1080/07315171.2016.1171116","url":null,"abstract":"ABSTRACT The classical explanation of the shielding charges at the surface of a ferroelectric was looked back at first. Then based on the non-equilibrium (or irreversible) thermodynamic description of ferroelectric phase transitions, a new explanation of that was given out. They agree with each other. In particular, the former is a special case of the latter.","PeriodicalId":50451,"journal":{"name":"Ferroelectrics Letters Section","volume":"180 1","pages":"11 - 8"},"PeriodicalIF":0.4,"publicationDate":"2016-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73178948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-05-26DOI: 10.1080/07315171.2016.1172001
R. Upadhyay, Sriranganath Annam, M. Patel, A. Sharma, Pratik Mevada, U. Joshi
ABSTRACT Frequency and phase agile microstrip antenna applications require relatively thick Barium Strontium Titanate (BST) films for good tunability. In this work, Polymer (PEG-200) modified MOSD process route is developed to produce cracks free (Ba0.6, Sr0.4) TiO3 Thick film on Low loss ST-X quartz substrate. Structural and electrical characteristics of the deposited films were investigated using Atomic Force Microscope, X-Ray Diffraction, C-V and C-F characterizations. XRD characterization conformed the single BST phase with polycrystalline nature of the film. AFM analysis depicted equiaxed shaped grains with average grain size and roughness of 120 nm and 4.15 nm respectively. Dielectric tunability, dielectric constant and loss tangent of the deposited films were 36.46%, 310 and 0.0213 respectively at 1 MHz frequency using MIM capacitive structure where conductive oxide LNO was used as bottom electrode. The applicability of polymer modified BST thick films over low loss substrate as composite substrate for tunable microstrip antenna applications at microwave frequency was demonstrated by design, fabrication and testing of a compact frequency tunable microstrip antenna in coplanar configuration. The tunability exhibited at X band frequency proves the suitability of developed processed route for tunable antenna applications.
{"title":"Ba0.6Sr0.4TiO3 thick film derived by polymer modified MOSD route for tunable microstrip antenna applications","authors":"R. Upadhyay, Sriranganath Annam, M. Patel, A. Sharma, Pratik Mevada, U. Joshi","doi":"10.1080/07315171.2016.1172001","DOIUrl":"https://doi.org/10.1080/07315171.2016.1172001","url":null,"abstract":"ABSTRACT Frequency and phase agile microstrip antenna applications require relatively thick Barium Strontium Titanate (BST) films for good tunability. In this work, Polymer (PEG-200) modified MOSD process route is developed to produce cracks free (Ba0.6, Sr0.4) TiO3 Thick film on Low loss ST-X quartz substrate. Structural and electrical characteristics of the deposited films were investigated using Atomic Force Microscope, X-Ray Diffraction, C-V and C-F characterizations. XRD characterization conformed the single BST phase with polycrystalline nature of the film. AFM analysis depicted equiaxed shaped grains with average grain size and roughness of 120 nm and 4.15 nm respectively. Dielectric tunability, dielectric constant and loss tangent of the deposited films were 36.46%, 310 and 0.0213 respectively at 1 MHz frequency using MIM capacitive structure where conductive oxide LNO was used as bottom electrode. The applicability of polymer modified BST thick films over low loss substrate as composite substrate for tunable microstrip antenna applications at microwave frequency was demonstrated by design, fabrication and testing of a compact frequency tunable microstrip antenna in coplanar configuration. The tunability exhibited at X band frequency proves the suitability of developed processed route for tunable antenna applications.","PeriodicalId":50451,"journal":{"name":"Ferroelectrics Letters Section","volume":"89 1","pages":"25 - 33"},"PeriodicalIF":0.4,"publicationDate":"2016-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84267922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：