Pub Date : 1994-08-07DOI: 10.1109/ISAF.1994.522304
F. Batllo, N. Floquet, M. Maglione, M. Mesnier, J. Nièpce, P. Perriat, P. Sarrazin, C. Valot
Through three different studies using various kinds of BaTiO/sub 3/ samples: as a powder while heating over the Curie temperature; as a green ceramic as a function of the forming pressure; as a ceramic while applying a D.C. field. It is shown how X-ray diffraction is able to give information about the evolution of the 90/spl deg/ ferroelectric domain microstructure.
{"title":"Fine grain barium titanate: ferroelectric domains and X-ray diffraction diagram","authors":"F. Batllo, N. Floquet, M. Maglione, M. Mesnier, J. Nièpce, P. Perriat, P. Sarrazin, C. Valot","doi":"10.1109/ISAF.1994.522304","DOIUrl":"https://doi.org/10.1109/ISAF.1994.522304","url":null,"abstract":"Through three different studies using various kinds of BaTiO/sub 3/ samples: as a powder while heating over the Curie temperature; as a green ceramic as a function of the forming pressure; as a ceramic while applying a D.C. field. It is shown how X-ray diffraction is able to give information about the evolution of the 90/spl deg/ ferroelectric domain microstructure.","PeriodicalId":20488,"journal":{"name":"Proceedings of 1994 IEEE International Symposium on Applications of Ferroelectrics","volume":"18 1","pages":"87-90"},"PeriodicalIF":0.0,"publicationDate":"1994-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78490161","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 : 1994-08-07DOI: 10.1109/ISAF.1994.522309
P. Talwar, R. P. Tandon, A. Mansingh
Modified lead titanate ceramics were prepared using mixed oxide route. A fixed amount of (1 mol%) iron (Fe) was added to get highly dense ceramics. Addition of 1 mol% tungsten (W) greatly enhanced the grain size. Lanthanum (La) concentration was changed from 2 to 25 mol%, keeping the concentration of Fe and W fixed at 1 mol%. The Curie temperature and tetragonality decreased with increasing La content. The dielectric constant showed a systematic increase with increasing La content. The piezoelectric coefficient were determined and it was found that the thickness coupling coefficient (k/sub t/) showed a marked increase with increasing La content reaching a peak value of 0.60 around 15 mol% while planar coupling coefficient (k/sub p/) was found to be almost independent of composition and having a value around 0.1. The hydrostatic figure of merit of about 1400 was achieved for 15 mol% of La which is one of the highest reported values even for hot pressed ceramics.
{"title":"Effects of lanthanum doping on the grain size and piezoelectric properties of lead titanate ceramics","authors":"P. Talwar, R. P. Tandon, A. Mansingh","doi":"10.1109/ISAF.1994.522309","DOIUrl":"https://doi.org/10.1109/ISAF.1994.522309","url":null,"abstract":"Modified lead titanate ceramics were prepared using mixed oxide route. A fixed amount of (1 mol%) iron (Fe) was added to get highly dense ceramics. Addition of 1 mol% tungsten (W) greatly enhanced the grain size. Lanthanum (La) concentration was changed from 2 to 25 mol%, keeping the concentration of Fe and W fixed at 1 mol%. The Curie temperature and tetragonality decreased with increasing La content. The dielectric constant showed a systematic increase with increasing La content. The piezoelectric coefficient were determined and it was found that the thickness coupling coefficient (k/sub t/) showed a marked increase with increasing La content reaching a peak value of 0.60 around 15 mol% while planar coupling coefficient (k/sub p/) was found to be almost independent of composition and having a value around 0.1. The hydrostatic figure of merit of about 1400 was achieved for 15 mol% of La which is one of the highest reported values even for hot pressed ceramics.","PeriodicalId":20488,"journal":{"name":"Proceedings of 1994 IEEE International Symposium on Applications of Ferroelectrics","volume":"47 1","pages":"105-107"},"PeriodicalIF":0.0,"publicationDate":"1994-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75747100","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 : 1994-08-07DOI: 10.1109/ISAF.1994.522438
Kyungjun Min, N. Kim
Reaction sequence of perovskite-phase formation crystallographic properties in the PFW-PFN system are reported. Investigation is focused on the formation of perovskite phase by a "B-site precursor method." B-site precursors were formed directly from the constituent oxides or through a competition with a pyrochlore-related phase, while perovskite phases were developed through a competition with pyrochlores. Lattice parameters of PFW and PFN were 3.985 and 4.016 /spl Aring/, respectively.
{"title":"Reaction sequence of perovskite formation process in PFW-PFN system by B-site precursor method","authors":"Kyungjun Min, N. Kim","doi":"10.1109/ISAF.1994.522438","DOIUrl":"https://doi.org/10.1109/ISAF.1994.522438","url":null,"abstract":"Reaction sequence of perovskite-phase formation crystallographic properties in the PFW-PFN system are reported. Investigation is focused on the formation of perovskite phase by a \"B-site precursor method.\" B-site precursors were formed directly from the constituent oxides or through a competition with a pyrochlore-related phase, while perovskite phases were developed through a competition with pyrochlores. Lattice parameters of PFW and PFN were 3.985 and 4.016 /spl Aring/, respectively.","PeriodicalId":20488,"journal":{"name":"Proceedings of 1994 IEEE International Symposium on Applications of Ferroelectrics","volume":"10 1","pages":"591-594"},"PeriodicalIF":0.0,"publicationDate":"1994-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72831921","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 : 1994-08-07DOI: 10.1109/ISAF.1994.522350
E.E. Alberta, A. Bhalla
This paper will present an initial evaluation of the lead zirconate-lead zinc niobate solid solution for use in nonvolatile ferroelectric memory devices. Previous work has shown that the (x)/spl middot/PbZrO/sub 3/-(1-x)/spl middot/Pb(Zn/sub 1/3/Nb/sub 2/3/)O/sub 3/ [PZZN] system has "square" hysteresis loops accompanied by large remnant polarizations. In particular, compositions near the room temperature antiferroelectric to ferroelectric phase boundary will be investigated.
{"title":"An evaluation of lead-zirconate based ceramics for use in nonvolatile ferroelectric memory devices","authors":"E.E. Alberta, A. Bhalla","doi":"10.1109/ISAF.1994.522350","DOIUrl":"https://doi.org/10.1109/ISAF.1994.522350","url":null,"abstract":"This paper will present an initial evaluation of the lead zirconate-lead zinc niobate solid solution for use in nonvolatile ferroelectric memory devices. Previous work has shown that the (x)/spl middot/PbZrO/sub 3/-(1-x)/spl middot/Pb(Zn/sub 1/3/Nb/sub 2/3/)O/sub 3/ [PZZN] system has \"square\" hysteresis loops accompanied by large remnant polarizations. In particular, compositions near the room temperature antiferroelectric to ferroelectric phase boundary will be investigated.","PeriodicalId":20488,"journal":{"name":"Proceedings of 1994 IEEE International Symposium on Applications of Ferroelectrics","volume":"57 1","pages":"249-252"},"PeriodicalIF":0.0,"publicationDate":"1994-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79811844","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 : 1994-08-07DOI: 10.1109/ISAF.1994.522307
V. V. Eremkin, V. Smotrakov, L.E. Balyunis, S. I. Shevtsova, A. Kozakov
Phase T,x-diagram of the Pb/sub 1-x/Ca/sub x/TiO/sub 3/ (0/spl les/x/spl les/0.62) solid solution system has been constructed in the range from room temperature to 770 K using data of single crystal optical studies and X-ray microanalysis. Besides the typical for PbTiO/sub 3/ ferroelectric tetragonal and paraelectric cubic phases, two ferro- and non-ferroelectric ones having the pseudomonoclinic unit cell distortions also as two additional tetragonal phases, at least one of which is confidently non-ferroelectric, have been found and their exact stability limits have been determined.
{"title":"Phase T,x-diagram of Pb/sub 1-x/Ca/sub x/TiO/sub 3/ single crystals","authors":"V. V. Eremkin, V. Smotrakov, L.E. Balyunis, S. I. Shevtsova, A. Kozakov","doi":"10.1109/ISAF.1994.522307","DOIUrl":"https://doi.org/10.1109/ISAF.1994.522307","url":null,"abstract":"Phase T,x-diagram of the Pb/sub 1-x/Ca/sub x/TiO/sub 3/ (0/spl les/x/spl les/0.62) solid solution system has been constructed in the range from room temperature to 770 K using data of single crystal optical studies and X-ray microanalysis. Besides the typical for PbTiO/sub 3/ ferroelectric tetragonal and paraelectric cubic phases, two ferro- and non-ferroelectric ones having the pseudomonoclinic unit cell distortions also as two additional tetragonal phases, at least one of which is confidently non-ferroelectric, have been found and their exact stability limits have been determined.","PeriodicalId":20488,"journal":{"name":"Proceedings of 1994 IEEE International Symposium on Applications of Ferroelectrics","volume":"1 1","pages":"97-100"},"PeriodicalIF":0.0,"publicationDate":"1994-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79837433","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 : 1994-08-07DOI: 10.1109/ISAF.1994.522317
P. Lu, M.M. Zhang, W. Xue, X.F. Wang, W. Huebner
The phase diagram of the (Pb/sub 0.85/Sm/sub 0.10/)(Ti/sub 0.98/Mn/sub 0.02/)O/sub 3/-BiFeO/sub 3/ system was studied by measuring the dielectric behavior as a function of temperature, coupled with room temperature XRD and measurements of d/sub 33/, k/sub t/ and k/sub p/. A morphotropic phase boundary exists for between the tetragonal and rhombohedral phases for a BiFeO/sub 3/ content of /spl ap/55 mole%. Some of the studied compositions exhibit electromechanical properties suitable for transducer applications.
{"title":"Investigations of the phase diagram of the PbTiO/sub 3/-BiFeO/sub 3/ system","authors":"P. Lu, M.M. Zhang, W. Xue, X.F. Wang, W. Huebner","doi":"10.1109/ISAF.1994.522317","DOIUrl":"https://doi.org/10.1109/ISAF.1994.522317","url":null,"abstract":"The phase diagram of the (Pb/sub 0.85/Sm/sub 0.10/)(Ti/sub 0.98/Mn/sub 0.02/)O/sub 3/-BiFeO/sub 3/ system was studied by measuring the dielectric behavior as a function of temperature, coupled with room temperature XRD and measurements of d/sub 33/, k/sub t/ and k/sub p/. A morphotropic phase boundary exists for between the tetragonal and rhombohedral phases for a BiFeO/sub 3/ content of /spl ap/55 mole%. Some of the studied compositions exhibit electromechanical properties suitable for transducer applications.","PeriodicalId":20488,"journal":{"name":"Proceedings of 1994 IEEE International Symposium on Applications of Ferroelectrics","volume":"26 1","pages":"134-137"},"PeriodicalIF":0.0,"publicationDate":"1994-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84519753","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 : 1994-08-07DOI: 10.1109/ISAF.1994.522489
S. Ivanova
The dependence of the speckle-field in Ba/sub 2/NaNb/sub 5/O/sub 15/ crystals in laser beam on the orientation of the crystals, temperature and direction of growing was investigated. The different pattern of scattering along the a and c axis make it possible to unambiguously determine the direction of the ferroelectric axis in the crystal, while abrupt change in the nature of scattering with a ferroelectric phase transition makes it possible to determine the Curie point.
{"title":"Anisotropy of speckle-field in barium-sodium niobate crystals","authors":"S. Ivanova","doi":"10.1109/ISAF.1994.522489","DOIUrl":"https://doi.org/10.1109/ISAF.1994.522489","url":null,"abstract":"The dependence of the speckle-field in Ba/sub 2/NaNb/sub 5/O/sub 15/ crystals in laser beam on the orientation of the crystals, temperature and direction of growing was investigated. The different pattern of scattering along the a and c axis make it possible to unambiguously determine the direction of the ferroelectric axis in the crystal, while abrupt change in the nature of scattering with a ferroelectric phase transition makes it possible to determine the Curie point.","PeriodicalId":20488,"journal":{"name":"Proceedings of 1994 IEEE International Symposium on Applications of Ferroelectrics","volume":"188 1","pages":"781-783"},"PeriodicalIF":0.0,"publicationDate":"1994-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83825972","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 : 1994-08-07DOI: 10.1109/ISAF.1994.522355
S. N. Narayana Murty, S. Bangar Raju, A. Bhanumathi, G. Padmavathi, K. Linga Murty
Strontium barium niobate (SBN) is a ferroelectric solid solution with tetragonal tungsten bronze structure. SBN exhibits excellent pyroelectric and electro-optic properties. Solid solutions of (Sr/sub x/Ba/sub 1-x/)/sub 0.8/ Na/sub 0.4/R/sub y/Nb/sub 2/O/sub 6/ where R/sub y/=Y, Zn, Mg, Fe, have been prepared by the conventional ceramic technique. The microstructures were studied with the aid of a scanning electron microscope on fractured surfaces of ceramic compositions and the average grain diameter was measured by the linear intercept method. The results are discussed in relation to the grain sizes.
{"title":"Microstructural studies of modified SBN ceramics","authors":"S. N. Narayana Murty, S. Bangar Raju, A. Bhanumathi, G. Padmavathi, K. Linga Murty","doi":"10.1109/ISAF.1994.522355","DOIUrl":"https://doi.org/10.1109/ISAF.1994.522355","url":null,"abstract":"Strontium barium niobate (SBN) is a ferroelectric solid solution with tetragonal tungsten bronze structure. SBN exhibits excellent pyroelectric and electro-optic properties. Solid solutions of (Sr/sub x/Ba/sub 1-x/)/sub 0.8/ Na/sub 0.4/R/sub y/Nb/sub 2/O/sub 6/ where R/sub y/=Y, Zn, Mg, Fe, have been prepared by the conventional ceramic technique. The microstructures were studied with the aid of a scanning electron microscope on fractured surfaces of ceramic compositions and the average grain diameter was measured by the linear intercept method. The results are discussed in relation to the grain sizes.","PeriodicalId":20488,"journal":{"name":"Proceedings of 1994 IEEE International Symposium on Applications of Ferroelectrics","volume":"114 1","pages":"269-272"},"PeriodicalIF":0.0,"publicationDate":"1994-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80776368","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 : 1994-08-07DOI: 10.1109/ISAF.1994.522443
B. Jin, S. Erdei, A. Bhalla
Several kinds of dopants (alanine, LiVO/sub 3/ and valine) doped TGS were grown from solution by slow cooling method. Temperature dependence dielectric spectra were measured to study the variation of transition temperature, K/sub max/ and room temperature dielectric constant depending on the dopants. Furthermore, several pieces were selected to investigate the positional inhomogeneities of the same sample. D-E hysteresis loop measurements were done to check for the internal bias field (E/sub b/). We could not get a high figure of merit (p/K) in valine doped TGS because of low temperature relaxation around -10/spl deg/C, although it has three times higher pyroelectric coefficient than that of alanine at transition temperature (T/sub C/).
{"title":"Dielectric properties and low temperature relaxation studies of doped TGS single crystals","authors":"B. Jin, S. Erdei, A. Bhalla","doi":"10.1109/ISAF.1994.522443","DOIUrl":"https://doi.org/10.1109/ISAF.1994.522443","url":null,"abstract":"Several kinds of dopants (alanine, LiVO/sub 3/ and valine) doped TGS were grown from solution by slow cooling method. Temperature dependence dielectric spectra were measured to study the variation of transition temperature, K/sub max/ and room temperature dielectric constant depending on the dopants. Furthermore, several pieces were selected to investigate the positional inhomogeneities of the same sample. D-E hysteresis loop measurements were done to check for the internal bias field (E/sub b/). We could not get a high figure of merit (p/K) in valine doped TGS because of low temperature relaxation around -10/spl deg/C, although it has three times higher pyroelectric coefficient than that of alanine at transition temperature (T/sub C/).","PeriodicalId":20488,"journal":{"name":"Proceedings of 1994 IEEE International Symposium on Applications of Ferroelectrics","volume":"78 1","pages":"607-610"},"PeriodicalIF":0.0,"publicationDate":"1994-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76343523","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 : 1994-08-07DOI: 10.1109/ISAF.1994.522392
J. Kim, S. Kwun, J. Yoon
Thin films of barium strontium titanate, Ba/sub 1-x/Sr/sub x/TiO/sub 3/, were deposited on Si and ITO/glass substrates with 200/spl sim/300 nm thickness by sol-gel method. The precursor solution of BST was prepared by mixing the 0.2 M precursor solutions of BaTiO/sub 3/ and SrTiO/sub 3/ with proper molar ratio. The X-ray diffraction (XRD) patterns show characteristic peaks with weak and broad features indicating that the polycrystalline BST film has poor crystallinity. The grain size and the surface morphology of the films were investigated by atomic force microscope (AFM). Especially, dependence of the film structures on the treatments of precursor solution such as hydrolysis and modification with acetic acid was investigated. The I-V (current-voltage) characteristics of the films was also dependent on the precursor structure. The C-V (capacitance-voltage) behavior of the films with MIS (metal-insulator-semiconductor) and MIM (metal-insulator-metal) structures were studied. Also, dielectric permittivity which was very strongly dependent on the crystallinity of the films was discussed in conjunction with precursor structures.
{"title":"Precursor dependent properties of Ba/sub 1-x/Sr/sub x/TiO/sub 3/ thin films fabricated by sol-gel method","authors":"J. Kim, S. Kwun, J. Yoon","doi":"10.1109/ISAF.1994.522392","DOIUrl":"https://doi.org/10.1109/ISAF.1994.522392","url":null,"abstract":"Thin films of barium strontium titanate, Ba/sub 1-x/Sr/sub x/TiO/sub 3/, were deposited on Si and ITO/glass substrates with 200/spl sim/300 nm thickness by sol-gel method. The precursor solution of BST was prepared by mixing the 0.2 M precursor solutions of BaTiO/sub 3/ and SrTiO/sub 3/ with proper molar ratio. The X-ray diffraction (XRD) patterns show characteristic peaks with weak and broad features indicating that the polycrystalline BST film has poor crystallinity. The grain size and the surface morphology of the films were investigated by atomic force microscope (AFM). Especially, dependence of the film structures on the treatments of precursor solution such as hydrolysis and modification with acetic acid was investigated. The I-V (current-voltage) characteristics of the films was also dependent on the precursor structure. The C-V (capacitance-voltage) behavior of the films with MIS (metal-insulator-semiconductor) and MIM (metal-insulator-metal) structures were studied. Also, dielectric permittivity which was very strongly dependent on the crystallinity of the films was discussed in conjunction with precursor structures.","PeriodicalId":20488,"journal":{"name":"Proceedings of 1994 IEEE International Symposium on Applications of Ferroelectrics","volume":"19 1","pages":"423-426"},"PeriodicalIF":0.0,"publicationDate":"1994-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89592257","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}
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：