Yu Ogura, Yuki Tsuchiya, Sena Hoshino, Tatsuya Yokoi, Katsuyuki Matsunaga
The photoplastic effect, phenomena that flow stress and/or hardness change by light illuminations, has been known mainly in II–VI compound semiconductors. In this study, it was revealed for the first time that magnesium oxide (MgO) single crystals exhibit increase in flow stress by light illumination, namely, the positive photoplastic effect. Scanning transmission electron microscope (STEM) observations demonstrated that the plastic deformation of MgO is realized by generation of glide dislocations on the slip system of {110}〈110〉. Therefore, the observed positive photoplastic effect of MgO is likely due to interactions of the glide dislocations and photo-excited carriers. According to the theoretical calculations, individual dislocations in MgO had a specific band structure that differs from the bulk. This also indicates possible interactions between dislocations and carriers. It is expected that light illumination can reduce dislocation mobility in MgO, leading to the increase in flow stress under light illuminations.
{"title":"Photoplastic effect in MgO single crystals","authors":"Yu Ogura, Yuki Tsuchiya, Sena Hoshino, Tatsuya Yokoi, Katsuyuki Matsunaga","doi":"10.2109/jcersj2.23060","DOIUrl":"https://doi.org/10.2109/jcersj2.23060","url":null,"abstract":"The photoplastic effect, phenomena that flow stress and/or hardness change by light illuminations, has been known mainly in II–VI compound semiconductors. In this study, it was revealed for the first time that magnesium oxide (MgO) single crystals exhibit increase in flow stress by light illumination, namely, the positive photoplastic effect. Scanning transmission electron microscope (STEM) observations demonstrated that the plastic deformation of MgO is realized by generation of glide dislocations on the slip system of {110}〈110〉. Therefore, the observed positive photoplastic effect of MgO is likely due to interactions of the glide dislocations and photo-excited carriers. According to the theoretical calculations, individual dislocations in MgO had a specific band structure that differs from the bulk. This also indicates possible interactions between dislocations and carriers. It is expected that light illumination can reduce dislocation mobility in MgO, leading to the increase in flow stress under light illuminations.","PeriodicalId":17246,"journal":{"name":"Journal of the Ceramic Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135372816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The surface image measurement time was reduced by data completion using a compressed sensing algorithm in the image-acquisition of scanning probe microscopy. In particular, by reducing the number of acquisition points of the surface-roughness image and reconstructing the image using estimated values, acquiring the surface image at one-eighth of the data-measurement time became possible. The reduced measurement time was shown to reduce the influence of thermal drift during image capture. The real time surface image demonstrated that reconstruction is possible during surface image acquisition.
{"title":"Time-reduction imaging method for scanning-probe microscopy using a compressed sensing algorithm based on sequential reconstruction method","authors":"Keiichi Ueda, Diao Zhuo, Linfeng Hou, Hayato Yamashita, Masayuki Abe","doi":"10.2109/jcersj2.23042","DOIUrl":"https://doi.org/10.2109/jcersj2.23042","url":null,"abstract":"The surface image measurement time was reduced by data completion using a compressed sensing algorithm in the image-acquisition of scanning probe microscopy. In particular, by reducing the number of acquisition points of the surface-roughness image and reconstructing the image using estimated values, acquiring the surface image at one-eighth of the data-measurement time became possible. The reduced measurement time was shown to reduce the influence of thermal drift during image capture. The real time surface image demonstrated that reconstruction is possible during surface image acquisition.","PeriodicalId":17246,"journal":{"name":"Journal of the Ceramic Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135372989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Octacalcium phosphate (OCP) has a layered structure and various carboxylate ions can be incorporated into its structure as interlayer ions. In recent studies, aromatic carboxylate ions have been incorporated into OCP to impart fluorescence properties. In such fluorescent OCP materials, the incorporated carboxylate ions can be regarded as ‘crystal defect cores’. Although fluorescent OCPs with incorporated benzenedicarboxylate ions have been reported, the synthesis and fluorescence of OCPs with incorporated pyridinedicarboxlate ions have not yet been investigated. In this study, our aim was to synthesise OCP with incorporated 2,5-pyridinedicarboxylate ions and evaluate its fluorescence behaviour. Samples were synthesised by reacting calcium carbonate and phosphoric acid in 2,5-pyridinedicarboxylic acid solution. When the 2,5-pyridinedicarboxylic acid concentration in the solution was low, plate-shaped crystals of OCP with incorporated 2,5-pyridinedicarboxylate ions were formed. As the 2,5-pyridinedicarboxylic acid concentration increased, OCP formation was suppressed, and a poorly soluble salt composed of calcium and 2,5-pyridinedicarboxylate ions was formed in its place. The (100) interplanar spacing of OCP was increased from 1.87 to 2.26 nm by the incorporation of 2,5-pyridinedicarboxylate ions as interlayer ions. The incorporation of 2,5-pyridinedicarboxylate ions was confirmed by Fourier-transform infrared spectroscopy. OCP with incorporated 2,5-pyridinedicarboxylate ions exhibited fluorescence with an emission wavelength of 430 nm upon excitation at 320 nm. The results of this study should prove useful for the design and development of fluorescent OCP materials.
{"title":"Synthesis and fluorescence properties of octacalcium phosphate with incorporated pyridinedicarboxylate ions","authors":"Taishi Yokoi, Masahiro Watanabe, Yuejun Wang, Tomoyo Goto, Tohru Sekino, Masaya Shimabukuro, Masakazu Kawashita","doi":"10.2109/jcersj2.23027","DOIUrl":"https://doi.org/10.2109/jcersj2.23027","url":null,"abstract":"Octacalcium phosphate (OCP) has a layered structure and various carboxylate ions can be incorporated into its structure as interlayer ions. In recent studies, aromatic carboxylate ions have been incorporated into OCP to impart fluorescence properties. In such fluorescent OCP materials, the incorporated carboxylate ions can be regarded as ‘crystal defect cores’. Although fluorescent OCPs with incorporated benzenedicarboxylate ions have been reported, the synthesis and fluorescence of OCPs with incorporated pyridinedicarboxlate ions have not yet been investigated. In this study, our aim was to synthesise OCP with incorporated 2,5-pyridinedicarboxylate ions and evaluate its fluorescence behaviour. Samples were synthesised by reacting calcium carbonate and phosphoric acid in 2,5-pyridinedicarboxylic acid solution. When the 2,5-pyridinedicarboxylic acid concentration in the solution was low, plate-shaped crystals of OCP with incorporated 2,5-pyridinedicarboxylate ions were formed. As the 2,5-pyridinedicarboxylic acid concentration increased, OCP formation was suppressed, and a poorly soluble salt composed of calcium and 2,5-pyridinedicarboxylate ions was formed in its place. The (100) interplanar spacing of OCP was increased from 1.87 to 2.26 nm by the incorporation of 2,5-pyridinedicarboxylate ions as interlayer ions. The incorporation of 2,5-pyridinedicarboxylate ions was confirmed by Fourier-transform infrared spectroscopy. OCP with incorporated 2,5-pyridinedicarboxylate ions exhibited fluorescence with an emission wavelength of 430 nm upon excitation at 320 nm. The results of this study should prove useful for the design and development of fluorescent OCP materials.","PeriodicalId":17246,"journal":{"name":"Journal of the Ceramic Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136081117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The structural and mechanical reliability of inorganic semiconductors for practical applications is determined by the rate at which they can deform and sustain externally applied strain. In this research, nanoindentation experiments under three strain rates and two light conditions were performed on single-crystal ZnS with an 80 nm radius Berkovich tip at a peak load of 60 µN. Significant pop-in events were observed in all indentation tests. The calculated maximum resolved shear stress at the first pop-in approximated the theoretical strength of ZnS, indicating a homogeneous dislocation nucleation process. The cumulative spreads of the maximum shear stress were found to be insensitive to the strain rate, and the distribution at a small strain rate was slightly broader than that of the other two strain rates because of thermal noise. Calculated activation energy ΔG required for the dislocation nucleation indicates that dislocation nucleation in ZnS could occur with external stress and without much assistance of thermal energy, leading to weak dependence of the first pop-in on the strain rate. At three strain rates, light consistently showed little influence on the pop-in behavior and dislocation nucleation process.
{"title":"Strain-rate insensitive photoindentation pop-in behavior in ZnS single crystals at room temperature","authors":"Yan Li, Hiroto Oguri, Ayaka Matsubara, Eita Tochigi, Xufei Fang, Yu Ogura, Katsuyuki Matsunaga, Atsutomo Nakamura","doi":"10.2109/jcersj2.23064","DOIUrl":"https://doi.org/10.2109/jcersj2.23064","url":null,"abstract":"The structural and mechanical reliability of inorganic semiconductors for practical applications is determined by the rate at which they can deform and sustain externally applied strain. In this research, nanoindentation experiments under three strain rates and two light conditions were performed on single-crystal ZnS with an 80 nm radius Berkovich tip at a peak load of 60 µN. Significant pop-in events were observed in all indentation tests. The calculated maximum resolved shear stress at the first pop-in approximated the theoretical strength of ZnS, indicating a homogeneous dislocation nucleation process. The cumulative spreads of the maximum shear stress were found to be insensitive to the strain rate, and the distribution at a small strain rate was slightly broader than that of the other two strain rates because of thermal noise. Calculated activation energy ΔG required for the dislocation nucleation indicates that dislocation nucleation in ZnS could occur with external stress and without much assistance of thermal energy, leading to weak dependence of the first pop-in on the strain rate. At three strain rates, light consistently showed little influence on the pop-in behavior and dislocation nucleation process.","PeriodicalId":17246,"journal":{"name":"Journal of the Ceramic Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135372640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Determining the stable atomic structure of grain boundaries (GBs) is one of the most important tasks for computational materials science to comprehensively understand the structure-property relationship of GBs in real polycrystalline materials. In this paper, we revisit a proposed method (PM) that was thought to be ineffective in determining the stable GB structures based on sampling non-identical terminating crystal planes of the two adjoining crystals forming the GB. In contrast to the previous conclusion, we found that the PM is effective regarding both the reproducibility of stable structures and calculation cost. This method could determine the most stable GB structures and energies of not only elemental materials of face-centered-cubic and body-centered-cubic metals, including Cu and Mo, but also a binary ceramic material, MgO. We show that the PM can greatly reduce the number of necessary candidate structures calculated to determine the stable GB structures compared with other brute-force methods sampling the rigid body translation between the two adjoining crystals. We demonstrated that sampling GB structures made of non-identical termination combinations is a useful and effective method to determine the stable GB structures of various materials.
{"title":"A guideline for searching for stable grain boundary structure by utilizing crystallographic information: A method based on non-identical termination","authors":"Yuki Hata, Yaoshu Xie, Kiyou Shibata, Teruyasu Mizoguchi","doi":"10.2109/jcersj2.23019","DOIUrl":"https://doi.org/10.2109/jcersj2.23019","url":null,"abstract":"Determining the stable atomic structure of grain boundaries (GBs) is one of the most important tasks for computational materials science to comprehensively understand the structure-property relationship of GBs in real polycrystalline materials. In this paper, we revisit a proposed method (PM) that was thought to be ineffective in determining the stable GB structures based on sampling non-identical terminating crystal planes of the two adjoining crystals forming the GB. In contrast to the previous conclusion, we found that the PM is effective regarding both the reproducibility of stable structures and calculation cost. This method could determine the most stable GB structures and energies of not only elemental materials of face-centered-cubic and body-centered-cubic metals, including Cu and Mo, but also a binary ceramic material, MgO. We show that the PM can greatly reduce the number of necessary candidate structures calculated to determine the stable GB structures compared with other brute-force methods sampling the rigid body translation between the two adjoining crystals. We demonstrated that sampling GB structures made of non-identical termination combinations is a useful and effective method to determine the stable GB structures of various materials.","PeriodicalId":17246,"journal":{"name":"Journal of the Ceramic Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135372795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Takumi Yabuzaki, Miho Sato, Hanseul Kim, Kenta Watanabe, Naoki Matsui, Kota Suzuki, Satoshi Hori, Kazuhiro Hikima, Satoshi Obokata, Hiroyuki Muto, Atsunori Matsuda, Ryoji Kanno, Masaaki Hirayama
Sulfide-type solid electrolytes for all-solid-state lithium-ion batteries are required to have high ionic conductivity, high (electro) chemical stability, and suitable mechanical properties. Compositing different materials is widely performed in developing multifunctional materials. However, only a few studies have investigated sulfide electrolytes due to the concern of lowering ionic conductivity. In this study, composite electrolytes comprising Li10GeP2S12 (LGPS)-type electrolytes and nanosized Al2O3 are fabricated by a solid-state reaction. Al2O3 particles are mainly located in the voids between LGPS particles, whereas very limited oxygen content is substituted for sulfur in the LGPS structure. LGPS–Al2O3 composites exhibit ionic conductivities of ∼5 mS cm−1 without significant changes by compositing Al2O3. LGPS–Al2O3 composites are softer and have higher atmospheric stability than uncomposed LGPS. All solid-state cells that use air-exposed LGPS–Al2O3 as a separator layer exhibit an improved cycle retention compared with that using air-exposed LGPS. These results demonstrate that electrolyte compositing is an effective means of improving other properties while maintaining high lithium ionic conductivity.
{"title":"Electrochemical and mechanical properties and chemical stability of Li<sub>10</sub>GeP<sub>2</sub>S<sub>12</sub>/Al<sub>2</sub>O<sub>3</sub> composite electrolytes","authors":"Takumi Yabuzaki, Miho Sato, Hanseul Kim, Kenta Watanabe, Naoki Matsui, Kota Suzuki, Satoshi Hori, Kazuhiro Hikima, Satoshi Obokata, Hiroyuki Muto, Atsunori Matsuda, Ryoji Kanno, Masaaki Hirayama","doi":"10.2109/jcersj2.23070","DOIUrl":"https://doi.org/10.2109/jcersj2.23070","url":null,"abstract":"Sulfide-type solid electrolytes for all-solid-state lithium-ion batteries are required to have high ionic conductivity, high (electro) chemical stability, and suitable mechanical properties. Compositing different materials is widely performed in developing multifunctional materials. However, only a few studies have investigated sulfide electrolytes due to the concern of lowering ionic conductivity. In this study, composite electrolytes comprising Li10GeP2S12 (LGPS)-type electrolytes and nanosized Al2O3 are fabricated by a solid-state reaction. Al2O3 particles are mainly located in the voids between LGPS particles, whereas very limited oxygen content is substituted for sulfur in the LGPS structure. LGPS–Al2O3 composites exhibit ionic conductivities of ∼5 mS cm−1 without significant changes by compositing Al2O3. LGPS–Al2O3 composites are softer and have higher atmospheric stability than uncomposed LGPS. All solid-state cells that use air-exposed LGPS–Al2O3 as a separator layer exhibit an improved cycle retention compared with that using air-exposed LGPS. These results demonstrate that electrolyte compositing is an effective means of improving other properties while maintaining high lithium ionic conductivity.","PeriodicalId":17246,"journal":{"name":"Journal of the Ceramic Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135372801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The copper (Cu) valence greatly influences the transition temperature (Tc) in cuprate superconductors. According to the charge neutralization rule, the Cu valence is calculated from the oxygen content. Previously, we developed the dissolved oxygen (DO) method as a novel oxygen measurement method for La2−xSrxCuO4 and YBa2Cu3Oy (YBCO) using a new DO sensor. The measurement time of the DO method is about one-third that of the standard iodometric method, but the difference in the measured Cu valence for YBCO is 0.039. Herein we report that a more accurate method, which combines the dissolved chlorine method and the corrected DO method, improves this difference to 0.013.
{"title":"A more accurate method to measure the oxygen content in YBa<sub>2</sub>Cu<sub>3</sub>O<i><sub>y</sub></i> superconductors","authors":"Yuliang Wei, Shiro Kambe","doi":"10.2109/jcersj2.23108","DOIUrl":"https://doi.org/10.2109/jcersj2.23108","url":null,"abstract":"The copper (Cu) valence greatly influences the transition temperature (Tc) in cuprate superconductors. According to the charge neutralization rule, the Cu valence is calculated from the oxygen content. Previously, we developed the dissolved oxygen (DO) method as a novel oxygen measurement method for La2−xSrxCuO4 and YBa2Cu3Oy (YBCO) using a new DO sensor. The measurement time of the DO method is about one-third that of the standard iodometric method, but the difference in the measured Cu valence for YBCO is 0.039. Herein we report that a more accurate method, which combines the dissolved chlorine method and the corrected DO method, improves this difference to 0.013.","PeriodicalId":17246,"journal":{"name":"Journal of the Ceramic Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135372805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Adding carbon nanotubes (CNTs) into ceramics is an important way to promote toughness. Crystalline defects existing in materials play a significant role in affecting both their mechanical and functional performances because they bring symmetry breaking of the periodic lattice structures. For CNTs existing in real ceramic materials, which almost appear as polycrystalline forms, the most notable defects are the grain boundaries (GBs) which consist of defect cores of dislocations. It is of engineering importance to investigate the effects of these defect cores of GBs on the strength of the polycrystalline CNTs to promote the composites’ performances. The variety of grain orientations of the polycrystalline CNTs allows the GBs to have various misorientations and different arrangements of the defect cores of dislocations at the GBs, which causes disparity in the stress fields near the GBs under an external stress condition, thus making distinguishable effects on the strength. While effective rules have been established for graphene (GP) GBs to predict the tensile strengths of GP GBs with different misorientations, the effects of misorientation and curvature on the strength of CNT GBs have yet to be reported. This work studied these effects by molecular dynamics (MD) simulation. The results illustrate that the misorientation and temperature have much more significant effects than the curvature on the strength of CNT GBs, and verified a consistent tendency of the misorientation-strength relationship of the CNT GBs with the corresponding GP GBs. The CNT GBs and their corresponding GP GBs have almost identical strengths for most of the simulated results. Notable differences between CNT and GP GBs were only found at misorientations near 0 and 30° in armchair GBs. These strength differences were attributed to the crack stabilization and structural reconstruction in CNT GBs.
{"title":"Tensile strength of a transverse grain boundary in a single-walled carbon nanotube","authors":"Yaoshu Xie, Kiyou Shibata, Teruyasu Mizoguchi","doi":"10.2109/jcersj2.23062","DOIUrl":"https://doi.org/10.2109/jcersj2.23062","url":null,"abstract":"Adding carbon nanotubes (CNTs) into ceramics is an important way to promote toughness. Crystalline defects existing in materials play a significant role in affecting both their mechanical and functional performances because they bring symmetry breaking of the periodic lattice structures. For CNTs existing in real ceramic materials, which almost appear as polycrystalline forms, the most notable defects are the grain boundaries (GBs) which consist of defect cores of dislocations. It is of engineering importance to investigate the effects of these defect cores of GBs on the strength of the polycrystalline CNTs to promote the composites’ performances. The variety of grain orientations of the polycrystalline CNTs allows the GBs to have various misorientations and different arrangements of the defect cores of dislocations at the GBs, which causes disparity in the stress fields near the GBs under an external stress condition, thus making distinguishable effects on the strength. While effective rules have been established for graphene (GP) GBs to predict the tensile strengths of GP GBs with different misorientations, the effects of misorientation and curvature on the strength of CNT GBs have yet to be reported. This work studied these effects by molecular dynamics (MD) simulation. The results illustrate that the misorientation and temperature have much more significant effects than the curvature on the strength of CNT GBs, and verified a consistent tendency of the misorientation-strength relationship of the CNT GBs with the corresponding GP GBs. The CNT GBs and their corresponding GP GBs have almost identical strengths for most of the simulated results. Notable differences between CNT and GP GBs were only found at misorientations near 0 and 30° in armchair GBs. These strength differences were attributed to the crack stabilization and structural reconstruction in CNT GBs.","PeriodicalId":17246,"journal":{"name":"Journal of the Ceramic Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135372976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-01DOI: 10.2109/jcersj2.131.a10-1
{"title":"Call for a Guest Editor for a Special Issue","authors":"","doi":"10.2109/jcersj2.131.a10-1","DOIUrl":"https://doi.org/10.2109/jcersj2.131.a10-1","url":null,"abstract":"","PeriodicalId":17246,"journal":{"name":"Journal of the Ceramic Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135372981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Takuya Sasaki, Ryota Asaka, Ken Niwa, Nico Alexander Gaida, Masashi Hasegawa
Ga- and Gd-substituted garnet-type Y3Al5O12:Mn4+ phosphors, Y3(Al1−xGax)5O12:Mn4+ and (Y1−yGdy)3Al5O12:Mn4+, were synthesized by a conventional solid-state reaction to elucidate the relationship between the emission and the local structure of the activator in the host material. Completely substituted Y3(Al1−xGax)5O12 and ∼80 % substituted (Y1−yGdy)3Al5O12 (y ≤ ∼0.8) solid solutions have been produced. The lattice parameters of the garnet-type solid solutions increased linearly with the substitution of Ga and Gd for Al and Y sites, respectively. The emission peak attributed to the Mn4+ luminescence center of their garnet-type solid solutions shifted toward a longer wavelength side by substituting Ga and Gd. The emission peak wavelength of the Mn4+-activated garnet-type solid solutions increased almost linearly with increasing the average bond length between the cation and anion in the dodecahedral sites. The dodecahedral site in the garnet structure is edge-sharing with the octahedral site where Mn4+ exists. These results indicate that the emission wavelength can be controlled by changing the local structure around Mn4+ due to the cation substitution of coordination polyhedra neighboring Mn4+ coordination polyhedra.
{"title":"Synthesis of garnet-type Mn<sup>4+</sup>-activated Y<sub>3</sub>(Al,Ga)<sub>5</sub>O<sub>12</sub> and (Y,Gd)<sub>3</sub>Al<sub>5</sub>O<sub>12</sub> phosphors with controlled emission by cation substitution","authors":"Takuya Sasaki, Ryota Asaka, Ken Niwa, Nico Alexander Gaida, Masashi Hasegawa","doi":"10.2109/jcersj2.23063","DOIUrl":"https://doi.org/10.2109/jcersj2.23063","url":null,"abstract":"Ga- and Gd-substituted garnet-type Y3Al5O12:Mn4+ phosphors, Y3(Al1−xGax)5O12:Mn4+ and (Y1−yGdy)3Al5O12:Mn4+, were synthesized by a conventional solid-state reaction to elucidate the relationship between the emission and the local structure of the activator in the host material. Completely substituted Y3(Al1−xGax)5O12 and ∼80 % substituted (Y1−yGdy)3Al5O12 (y ≤ ∼0.8) solid solutions have been produced. The lattice parameters of the garnet-type solid solutions increased linearly with the substitution of Ga and Gd for Al and Y sites, respectively. The emission peak attributed to the Mn4+ luminescence center of their garnet-type solid solutions shifted toward a longer wavelength side by substituting Ga and Gd. The emission peak wavelength of the Mn4+-activated garnet-type solid solutions increased almost linearly with increasing the average bond length between the cation and anion in the dodecahedral sites. The dodecahedral site in the garnet structure is edge-sharing with the octahedral site where Mn4+ exists. These results indicate that the emission wavelength can be controlled by changing the local structure around Mn4+ due to the cation substitution of coordination polyhedra neighboring Mn4+ coordination polyhedra.","PeriodicalId":17246,"journal":{"name":"Journal of the Ceramic Society of Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135372984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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