Pub Date : 2016-06-08DOI: 10.1080/22243682.2016.1192958
Saira Jabeen, Ayesha Kausar, Shaukat Saeed, B. Muhammad, Sagheer Gul
In this investigation, blends of poly(vinyl alcohol) and chitosan cross-linked with bis phenol-F-diglycidyl ether were prepared by solution casting method. Epoxy acted as a cross-linker and content was varied from 3.80 × 10−3 to 3.80 × 10−2 mol. Morphology of the blend was examined using scanning electron microscopy which showed homogenous morphology suggesting good miscibility between blend components. FTIR showed significant shifting of peak at 1063 cm−1 to higher frequency implying that intermolecular interaction disturbed crystallization of chitosan in blend. Thermal and mechanical properties were also analyzed by thermo-gravimetric analysis and universal mechanical tester, respectively. Thermal stability of PVA/Ch blends was increased in the presence of epoxy cross-linker. Investigation on mechanical properties of blended films showed that the blending improved the tensile strength (68 MPa), percentage elongation at break (31 MPa), and toughness (13 MPa) while a decrease in Young's modulus (299 MPa) ...
{"title":"Poly(vinyl alcohol) and chitosan blend cross-linked with bis phenol-F-diglycidyl ether: mechanical, thermal and water absorption investigation","authors":"Saira Jabeen, Ayesha Kausar, Shaukat Saeed, B. Muhammad, Sagheer Gul","doi":"10.1080/22243682.2016.1192958","DOIUrl":"https://doi.org/10.1080/22243682.2016.1192958","url":null,"abstract":"In this investigation, blends of poly(vinyl alcohol) and chitosan cross-linked with bis phenol-F-diglycidyl ether were prepared by solution casting method. Epoxy acted as a cross-linker and content was varied from 3.80 × 10−3 to 3.80 × 10−2 mol. Morphology of the blend was examined using scanning electron microscopy which showed homogenous morphology suggesting good miscibility between blend components. FTIR showed significant shifting of peak at 1063 cm−1 to higher frequency implying that intermolecular interaction disturbed crystallization of chitosan in blend. Thermal and mechanical properties were also analyzed by thermo-gravimetric analysis and universal mechanical tester, respectively. Thermal stability of PVA/Ch blends was increased in the presence of epoxy cross-linker. Investigation on mechanical properties of blended films showed that the blending improved the tensile strength (68 MPa), percentage elongation at break (31 MPa), and toughness (13 MPa) while a decrease in Young's modulus (299 MPa) ...","PeriodicalId":17291,"journal":{"name":"Journal of the Chinese Advanced Materials Society","volume":"43 1","pages":"211-227"},"PeriodicalIF":0.0,"publicationDate":"2016-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84603416","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 : 2016-06-07DOI: 10.1080/22243682.2016.1193823
S. Sharma, Karishma Singh, R. Shukla, A. Kumar
ABSTRACTIn the present case, we have reported the temperature dependence of ac conductivity for bulk samples of glassy Se90In10−xAgx (x = 0, 2, 4, 6, 8) at different frequencies. In certain temperature range, ac conductivity is found to increase exponentially with temperature. From these measurements activation energy and pre-exponential factor are calculated. It is found that pre-exponential factor does not remain constant but varies with activation energy. This verifies the validity of MN rule. The experiment has been carried out in the temperature range 289–402 K and frequency range 20–500 kHz.
{"title":"Observation of MN rule in ac conductivity of glassy Se90In10−xAgx","authors":"S. Sharma, Karishma Singh, R. Shukla, A. Kumar","doi":"10.1080/22243682.2016.1193823","DOIUrl":"https://doi.org/10.1080/22243682.2016.1193823","url":null,"abstract":"ABSTRACTIn the present case, we have reported the temperature dependence of ac conductivity for bulk samples of glassy Se90In10−xAgx (x = 0, 2, 4, 6, 8) at different frequencies. In certain temperature range, ac conductivity is found to increase exponentially with temperature. From these measurements activation energy and pre-exponential factor are calculated. It is found that pre-exponential factor does not remain constant but varies with activation energy. This verifies the validity of MN rule. The experiment has been carried out in the temperature range 289–402 K and frequency range 20–500 kHz.","PeriodicalId":17291,"journal":{"name":"Journal of the Chinese Advanced Materials Society","volume":"65 1","pages":"238-248"},"PeriodicalIF":0.0,"publicationDate":"2016-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90721912","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 : 2016-05-27DOI: 10.1080/22243682.2016.1188414
Mohammadreza Ebrahimi Fordoei, S. H. Hosseini, K. Madar, Mehrdad Khanda'i
Thermal barrier coatings are widely used in gas turbine motors in air and ground sections (electricity generation). One of the challenges in developing these coatings is the fracture occurring around the interface of the ceramic layer with thermally grown oxide layer. These fractures result from the accumulation of energy around this area. Important parameters influencing stress distribution and fracture of thermal barrier are the roughness of the bond coat layer, the thickness of the coating and the mechanical properties of the coating components. In this paper, the effect of the roughness of the bond coat surface on stress distribution in different parts of thermal barrier coatings resulting from electron beam physical vapor deposition (EB-PVD) process was studied. The results indicated increase in roughness enhanced the curvature area, premature degradation of coating system led to thermal barrier.
{"title":"Simulating the effect of roughness of the bond coat surface on stress distribution in EB-PVD thermal barrier coatings with finite element method","authors":"Mohammadreza Ebrahimi Fordoei, S. H. Hosseini, K. Madar, Mehrdad Khanda'i","doi":"10.1080/22243682.2016.1188414","DOIUrl":"https://doi.org/10.1080/22243682.2016.1188414","url":null,"abstract":"Thermal barrier coatings are widely used in gas turbine motors in air and ground sections (electricity generation). One of the challenges in developing these coatings is the fracture occurring around the interface of the ceramic layer with thermally grown oxide layer. These fractures result from the accumulation of energy around this area. Important parameters influencing stress distribution and fracture of thermal barrier are the roughness of the bond coat layer, the thickness of the coating and the mechanical properties of the coating components. In this paper, the effect of the roughness of the bond coat surface on stress distribution in different parts of thermal barrier coatings resulting from electron beam physical vapor deposition (EB-PVD) process was studied. The results indicated increase in roughness enhanced the curvature area, premature degradation of coating system led to thermal barrier.","PeriodicalId":17291,"journal":{"name":"Journal of the Chinese Advanced Materials Society","volume":"4 1","pages":"228-237"},"PeriodicalIF":0.0,"publicationDate":"2016-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88478983","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 : 2016-05-16DOI: 10.1080/22243682.2016.1181529
S. S. Dhasade, R. Gaikwad, S. B. Patwari, S. Patil
Manganese sulfide thin films were deposited on stainless steel and indium doped tin oxide substrates from an aqueous solution of MnSO4 and Na2S2O3. This study reports the effect of bath concentration on the crystal structure, surface morphology and optical properties of manganese sulfide nanostructured thin films. The electrodeposition time and bath concentration can be used to control the dimensions of the electrodeposited nanoflakes within nanometer range. Manganese sulfide thin films are polycrystalline with cubic crystal structure. Field emission scanning electron microscopy (FESEM) images indicate that the film surfaces are well-covered with manganese sulfide nanoflakes. The agglomeration of nanoflakes is enhanced due to the formation of a large number of particles during growth process.
{"title":"Synthesis of nanoflakes-like shapes of manganese sulfide grown at room temperature by electrodeposition method","authors":"S. S. Dhasade, R. Gaikwad, S. B. Patwari, S. Patil","doi":"10.1080/22243682.2016.1181529","DOIUrl":"https://doi.org/10.1080/22243682.2016.1181529","url":null,"abstract":"Manganese sulfide thin films were deposited on stainless steel and indium doped tin oxide substrates from an aqueous solution of MnSO4 and Na2S2O3. This study reports the effect of bath concentration on the crystal structure, surface morphology and optical properties of manganese sulfide nanostructured thin films. The electrodeposition time and bath concentration can be used to control the dimensions of the electrodeposited nanoflakes within nanometer range. Manganese sulfide thin films are polycrystalline with cubic crystal structure. Field emission scanning electron microscopy (FESEM) images indicate that the film surfaces are well-covered with manganese sulfide nanoflakes. The agglomeration of nanoflakes is enhanced due to the formation of a large number of particles during growth process.","PeriodicalId":17291,"journal":{"name":"Journal of the Chinese Advanced Materials Society","volume":"102 1","pages":"185-194"},"PeriodicalIF":0.0,"publicationDate":"2016-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80828178","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 : 2016-05-04DOI: 10.1080/22243682.2015.1100523
R. Edokpia, V. Aigbodion, C. Atuanya, J. Agunsoye, K. Mu’azu
This experimental study investigated the properties of eco-friendly (biodegradable) brake pad using egg shell (ES) particles and Gum Arabic (GA) as the binder in order to replace asbestos and formaldehyde resin which are carcinogenic in nature and not biodegradable. The brake pad formulation was produced by varying the GA from 3 to 18 wt%. The following properties were tested: wear rate, hardness values, compressive strength, thickness swelling in water and SAE oil, thermal resistance and specific gravity. The microstructure of the brake pad showed that fair bonding was achieved with the formulations from 15 to 18 wt% of GA. The sample with 18 wt% of GA in ES particles gave the best properties. The temperature of maximal decomposition of ES particles was higher than asbestos and many agro-wastes currently used in the production of brake pad materials. The results obtained at 18 wt% of GA in ES particles formulation compared favourably with the commercial brake pad. Hence, the developed brake pad can be us...
{"title":"Experimental study of the Properties of Brake pad using Egg shell particles-Gum Arabic composites","authors":"R. Edokpia, V. Aigbodion, C. Atuanya, J. Agunsoye, K. Mu’azu","doi":"10.1080/22243682.2015.1100523","DOIUrl":"https://doi.org/10.1080/22243682.2015.1100523","url":null,"abstract":"This experimental study investigated the properties of eco-friendly (biodegradable) brake pad using egg shell (ES) particles and Gum Arabic (GA) as the binder in order to replace asbestos and formaldehyde resin which are carcinogenic in nature and not biodegradable. The brake pad formulation was produced by varying the GA from 3 to 18 wt%. The following properties were tested: wear rate, hardness values, compressive strength, thickness swelling in water and SAE oil, thermal resistance and specific gravity. The microstructure of the brake pad showed that fair bonding was achieved with the formulations from 15 to 18 wt% of GA. The sample with 18 wt% of GA in ES particles gave the best properties. The temperature of maximal decomposition of ES particles was higher than asbestos and many agro-wastes currently used in the production of brake pad materials. The results obtained at 18 wt% of GA in ES particles formulation compared favourably with the commercial brake pad. Hence, the developed brake pad can be us...","PeriodicalId":17291,"journal":{"name":"Journal of the Chinese Advanced Materials Society","volume":"253 1","pages":"172-184"},"PeriodicalIF":0.0,"publicationDate":"2016-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75578213","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 : 2016-04-02DOI: 10.1080/22243682.2015.1118356
V. Aigbodion, F. M. Achiv, O. Agunsoye, L. A. Isah
The experimental evaluation of the electrical porcelain properties of alumina-silicates nano-clay was investigated. The nano-clay was produced using the sol-gel method. The properties analyzed were shrinkage test, porosity, plasticity, density, water absorption test and rupture test, mechanical falling load, dry frequency flashover voltage test and insulation test. The results obtained meet the requirement for low-voltage electrical porcelain, e.g., result of the mechanical falling load met the minimum required load of 13.5 kN specified for electricity transmission. The dry frequency flashover voltage of the sample was 26.7 kV which fell within the specified value of 25–30 kV. Finally, since the nano-clay was able to meet most of the criteria of electrical porcelain insulator, it can be used in the production of low-voltage porcelain.
{"title":"Evaluation of the electrical porcelain properties of alumina-silicate nano-clay","authors":"V. Aigbodion, F. M. Achiv, O. Agunsoye, L. A. Isah","doi":"10.1080/22243682.2015.1118356","DOIUrl":"https://doi.org/10.1080/22243682.2015.1118356","url":null,"abstract":"The experimental evaluation of the electrical porcelain properties of alumina-silicates nano-clay was investigated. The nano-clay was produced using the sol-gel method. The properties analyzed were shrinkage test, porosity, plasticity, density, water absorption test and rupture test, mechanical falling load, dry frequency flashover voltage test and insulation test. The results obtained meet the requirement for low-voltage electrical porcelain, e.g., result of the mechanical falling load met the minimum required load of 13.5 kN specified for electricity transmission. The dry frequency flashover voltage of the sample was 26.7 kV which fell within the specified value of 25–30 kV. Finally, since the nano-clay was able to meet most of the criteria of electrical porcelain insulator, it can be used in the production of low-voltage porcelain.","PeriodicalId":17291,"journal":{"name":"Journal of the Chinese Advanced Materials Society","volume":"6 1","pages":"99-109"},"PeriodicalIF":0.0,"publicationDate":"2016-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88306340","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 : 2016-03-31DOI: 10.1080/22243682.2016.1164618
Jay A. Tanna, R. Chaudhary, V. Sonkusare, H. Juneja
ABSTRACTCuO nanoparticles (NPs) with a crystalline size of around 10 nm have been synthesized via aqueous precipitation method and characterized by various standard microscopic techniques such as scanning electron microscopy, transmission electron microscopy and powder X-ray diffraction to determine the size and structure. It was characterized through Fourier transform infrared spectroscopy, energy dispersive X-ray spectroscopy and thermal analyses (TG/DTG/DTA, thermogravimetry analysis/derivative thermogravimetry/differential thermal analysis) to check out the purity of prepared NPs and composition. Furthermore, CuO NPs were efficiently used as a heterogeneous catalyst for one-pot multi-components synthesis of polyhydroquinoline derivatives via Hantzsch condensation under ultrasonic irradiation. Interestingly, nanocatalyst exhibited an excellent recyclability and reusability up to four times without any additional treatment. The present methodology through non-chromatographic methods offers several advan...
{"title":"CuO nanoparticles: synthesis, characterization and reusable catalyst for polyhydroquinoline derivatives under ultrasonication","authors":"Jay A. Tanna, R. Chaudhary, V. Sonkusare, H. Juneja","doi":"10.1080/22243682.2016.1164618","DOIUrl":"https://doi.org/10.1080/22243682.2016.1164618","url":null,"abstract":"ABSTRACTCuO nanoparticles (NPs) with a crystalline size of around 10 nm have been synthesized via aqueous precipitation method and characterized by various standard microscopic techniques such as scanning electron microscopy, transmission electron microscopy and powder X-ray diffraction to determine the size and structure. It was characterized through Fourier transform infrared spectroscopy, energy dispersive X-ray spectroscopy and thermal analyses (TG/DTG/DTA, thermogravimetry analysis/derivative thermogravimetry/differential thermal analysis) to check out the purity of prepared NPs and composition. Furthermore, CuO NPs were efficiently used as a heterogeneous catalyst for one-pot multi-components synthesis of polyhydroquinoline derivatives via Hantzsch condensation under ultrasonic irradiation. Interestingly, nanocatalyst exhibited an excellent recyclability and reusability up to four times without any additional treatment. The present methodology through non-chromatographic methods offers several advan...","PeriodicalId":17291,"journal":{"name":"Journal of the Chinese Advanced Materials Society","volume":"5 1","pages":"110-122"},"PeriodicalIF":0.0,"publicationDate":"2016-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78476256","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 : 2016-03-17DOI: 10.1080/22243682.2016.1160256
A. K. Jha, K. Prasad
ABSTRACTA novel technique of utilizing the dead mosquitoes (Culex Sp.) broth is reported with a conviction that dead animals and their tissue/organ wastes too can participate in nanoparticle synthesis as only organism is dead not the molecules which make them. A very simple environment friendly protocol employing the broth of the Culex Sp. yielded chalcogenide (CdS) nanoparticles. X-ray and transmission electron microscopy analyses are performed to ascertain the formation of CdS nanoparticles. Individual nanoparticles as well as a very few aggregate having the size of 2–14 nm are found. UV-Vis spectroscopy study revealed the surface plasmon resonance at 426 nm. The product also showed blue shift in the UV-Vis and photoluminescence (PL) spectra. A possible involved mechanism for the biosynthesis of CdS nanoparticles has also been proposed in which participation of tropomyosin, chitin and metallothioneins is suggested.
{"title":"Now the household mosquitoes (Culex Sp.) synthesize CdS nanoparticles","authors":"A. K. Jha, K. Prasad","doi":"10.1080/22243682.2016.1160256","DOIUrl":"https://doi.org/10.1080/22243682.2016.1160256","url":null,"abstract":"ABSTRACTA novel technique of utilizing the dead mosquitoes (Culex Sp.) broth is reported with a conviction that dead animals and their tissue/organ wastes too can participate in nanoparticle synthesis as only organism is dead not the molecules which make them. A very simple environment friendly protocol employing the broth of the Culex Sp. yielded chalcogenide (CdS) nanoparticles. X-ray and transmission electron microscopy analyses are performed to ascertain the formation of CdS nanoparticles. Individual nanoparticles as well as a very few aggregate having the size of 2–14 nm are found. UV-Vis spectroscopy study revealed the surface plasmon resonance at 426 nm. The product also showed blue shift in the UV-Vis and photoluminescence (PL) spectra. A possible involved mechanism for the biosynthesis of CdS nanoparticles has also been proposed in which participation of tropomyosin, chitin and metallothioneins is suggested.","PeriodicalId":17291,"journal":{"name":"Journal of the Chinese Advanced Materials Society","volume":"73 1","pages":"140-147"},"PeriodicalIF":0.0,"publicationDate":"2016-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76531901","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 : 2016-02-22DOI: 10.1080/22243682.2016.1151374
E. Pinčík, R. Brunner, H. Kobayashi, M. Mikula, P. Vojtek, J. Greguš, Z. Zábudlá, K. Imamura, P. Švec
ABSTRACTThe present paper deals with the photoluminescence (PL) of the multicolor silicon (MC-Si) – a nanocrystalline layer produced by the surface structure chemical transfer (SSCT) method on the p-type Si. The PL behaviours recorded at room temperature are compared with ∼500-nm-thick porous Si prepared electrochemically in the HF + methanol solution on the same Si substrate. The PL spectra of porous Si are shifted to higher energy in comparison with MC-Si. The PL records were fitted by Gaussian curves. We attribute the PL band of porous Si with maximum 2.3 eV to the own luminescence of ∼2.5-nm-thick nanocrystalline Si grains observed due to quantum confinement. This PL band is missing in the PL spectra of MC-Si structures due to the absence of Si nanocrystals of similar size. The PL bands of both MC-Si and porous Si between 1.89 and 2.05 eV are connected with SiO(x) compounds covering the surfaces of Si nanocrystals. Additional two PL bands of all MC-Si structures at 1.69–1.70 eV and 1.80–1.84 eV we rel...
{"title":"The photoluminescence of multicolor silicon","authors":"E. Pinčík, R. Brunner, H. Kobayashi, M. Mikula, P. Vojtek, J. Greguš, Z. Zábudlá, K. Imamura, P. Švec","doi":"10.1080/22243682.2016.1151374","DOIUrl":"https://doi.org/10.1080/22243682.2016.1151374","url":null,"abstract":"ABSTRACTThe present paper deals with the photoluminescence (PL) of the multicolor silicon (MC-Si) – a nanocrystalline layer produced by the surface structure chemical transfer (SSCT) method on the p-type Si. The PL behaviours recorded at room temperature are compared with ∼500-nm-thick porous Si prepared electrochemically in the HF + methanol solution on the same Si substrate. The PL spectra of porous Si are shifted to higher energy in comparison with MC-Si. The PL records were fitted by Gaussian curves. We attribute the PL band of porous Si with maximum 2.3 eV to the own luminescence of ∼2.5-nm-thick nanocrystalline Si grains observed due to quantum confinement. This PL band is missing in the PL spectra of MC-Si structures due to the absence of Si nanocrystals of similar size. The PL bands of both MC-Si and porous Si between 1.89 and 2.05 eV are connected with SiO(x) compounds covering the surfaces of Si nanocrystals. Additional two PL bands of all MC-Si structures at 1.69–1.70 eV and 1.80–1.84 eV we rel...","PeriodicalId":17291,"journal":{"name":"Journal of the Chinese Advanced Materials Society","volume":"28 1","pages":"158-171"},"PeriodicalIF":0.0,"publicationDate":"2016-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82075100","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 : 2016-02-19DOI: 10.1080/22243682.2016.1151376
P. B. Abhange, V. C. Malvade, S. R. Kulal, S. Chandralingam, S. Kokare
ABSTRACTThe high quality factor, high dielectric constant, low dielectric loss and small temperature coefficient of resonant frequency are the most desirable characteristics of the microwave dielectric materials. Considering the hazardous nature of lead-based ceramics, many research groups have paid great attention to the research on non-lead-based perovskite ceramic. Here, we synthesize the material BaNd2-xLaxTi4O12 (for x = 0.02, 0.04, 0.06 and 0.08) by choosing the method which is of low cost and easy. The X-ray diffraction (XRD) data confirm its orthorhombic crystal structure and the scanning electron microscopy (SEM) picture shows a grain size of less than 2 µm. The dielectric measurement gives temperature independency in the range from room temperature to 523 K, which is observed to be independent of level of concentration. The complex impedance measurement shows a double hemisphere indicating separate grain and grain-boundary contributions and is well resolved at higher temperature.
{"title":"Structural and dielectric studies of lanthanum-doped barium neodymium titanate","authors":"P. B. Abhange, V. C. Malvade, S. R. Kulal, S. Chandralingam, S. Kokare","doi":"10.1080/22243682.2016.1151376","DOIUrl":"https://doi.org/10.1080/22243682.2016.1151376","url":null,"abstract":"ABSTRACTThe high quality factor, high dielectric constant, low dielectric loss and small temperature coefficient of resonant frequency are the most desirable characteristics of the microwave dielectric materials. Considering the hazardous nature of lead-based ceramics, many research groups have paid great attention to the research on non-lead-based perovskite ceramic. Here, we synthesize the material BaNd2-xLaxTi4O12 (for x = 0.02, 0.04, 0.06 and 0.08) by choosing the method which is of low cost and easy. The X-ray diffraction (XRD) data confirm its orthorhombic crystal structure and the scanning electron microscopy (SEM) picture shows a grain size of less than 2 µm. The dielectric measurement gives temperature independency in the range from room temperature to 523 K, which is observed to be independent of level of concentration. The complex impedance measurement shows a double hemisphere indicating separate grain and grain-boundary contributions and is well resolved at higher temperature.","PeriodicalId":17291,"journal":{"name":"Journal of the Chinese Advanced Materials Society","volume":"5 1","pages":"91-98"},"PeriodicalIF":0.0,"publicationDate":"2016-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79997917","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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