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Publication Metadata only Oxidative thermal conversion of hydrothermal derived precursors toward the mixed-metal cobaltite spinel oxides (Znco2o4 and nico2o4): In-situ investigation by synchrotron-radiation xrd and xas techniques(2021-10-01) Wanchai Deeloed; Yuranan Hanlumyuang; Wanwisa Limphirat; Songwut Suramitr; Kantapat Chansaenpak; Pongsakorn Kanjanaboos; Suttipong Wannapaiboon; Worawat Wattanathana; Kasetsart University; Mahidol University; Thailand National Science and Technology Development Agency; Synchrotron Light Research InstituteIn-situ investigations of structural transitions during the thermal-oxidative event of mixedmetal spinel oxide precursors, the so-called nickel-(NCO) and zinc-containing (ZCO) cobaltite spinel precursors, were investigated to understand... the formations of the derived NiCo2O4 and ZnCo2O4 spinel oxides, respectively. In-situ XRD investigation revealed that emerged temperatures for spinel oxide phase were between 325 and 400◦C, depending on the cationic substituent. It indicated that the emergedPublication Metadata only An improved mean field theory for mixed spinel ferrites(1995-09-02) I. M. Tang; S. Varamit; Mahidol UniversityThe standard mean field approach neglects the random disordering of magnetic and nonmagnetic ions with the sublattice of the mixed spinel ferrites. It is known that this disordering can lead to real effects. A mean field theory is developed in whichPublication Metadata only Local field fluctuations in the mixed spinel ferrite, Ni1-xZnxFe2O4(1999-03-20) I. M. Tang; S. Varamit; B. Wiwatanapataphee; Mahidol University; The Institute of Science and Technology for Research and Development, Mahidol UniversityThe magnetic properties of the mixed spinel ferrites Ni1-xZnxFe2O4 are studied with the framework of a mean field approach which takes into account the effects of random arrangements of the Zn and Fe ions in the A-sublattice and of the Ni and FePublication Metadata only Enhancement of photocatalytic by Mn3O4 spinel ferrite decorated graphene oxide nanocomposites(2021-06-01) Tanawat Imboon; Jeerawan Khumphon; Khrongkhwan Yotkuna; I. Ming Tang; Sirikanjana Thongmee; Kasetsart University; Mahidol Universitybands from 250 to 550 nm. These bands arise from the d–d crystal field transitions of the tetrahedral Mn3+ species and indicate a distortion in the crystal structure. Photo-catalytic activity of spinel ferrite Mn3O4 NP’s by themselves was low but photo... with an interplanar d-spacing of 0.49 nm for (101) plane.2.Photocatalytic activity of spinel ferrite Mn3O4 nanoparticles by itself is low.3.Number of photoelectrons created depends on number of Mn3O4 on a given area of GO4.The bonding of the Mn3O4 to the GO sheetItem Metadata only Structural investigation and optical properties of cobalt aluminate pigments derived from thermal decomposition of mixed-metal nitrate co-crystals(2022-07-01) Yaemphutchong S.; Wattanathana W.; Chansaenpak K.; Singkammo S.; Kanjanaboos P.; Siri-apai P.; Janejobsakonkit S.; Pipattanaporn P.; Suetrong N.; Wannapaiboon S.; Hanlumyuang Y.; Mahidol UniversityIn this study, the coloration mechanism of cobalt aluminate spinel materials derived by thermal decomposition of the co-crystallized mixed-metal precursors has been reported. The structural alteration of cobalt aluminates, along with the origins... properties suggested that the coloration can be modified by controlling Co2+/Co3+ contents and their site occupancies in the spinel structure by adjusting calcination temperatures and selecting the counter ions with appropriate oxidizing power. The interplaysPublication Metadata only Cation distribution and magnetic behavior of Mg1 - XZn xFe2O4 ceramics monitored by Mössbauer Spectroscopy(2006-07-01) S. Ounnunkad; P. Winotai; S. Phanichphant; Chiang Mai University; Mahidol Universitysolid-state reaction using a mixed oxide method. All XRD patterns revealed only the monophasic spinel characteristic structure of MgFe2O4. The lattice parameters increased with the increasing of Zn content. Saturation magnetization (MS) of the ferritesItem Metadata only Gamma-irradiation assisted synthesis of nickel-cobalt oxide composites: Crystal structure dependency for supercapacitor efficiency(2025-02-05) Trakulmututa J.; Weerasuk B.; Sataman P.; Chutimasakul T.; Kamonsuangkasem K.; Smith S.M.; Sirisit N.; Sangtawesin T.; Trakulmututa J.; Mahidol Universityrevealed a dose-dependent relationship between rock-salt (NiO or NiCoO₂) and spinel (Co₃O₄ or NiCo₂O₄) phases. The composite synthesized at 300 kGy (300NCO) achieved a specific capacitance of 73 F.g−1. Furthermore, the diluted-precursor methodPublication Metadata only Rate dependent structural changes, cycling stability, and Li-ion diffusivity in a layered-layered oxide cathode material after prolonged cycling(2021-06-28) Songyoot Kaewmala; Wanwisa Limphirat; Visittapong Yordsri; Jeffrey Nash; Sutham Srilomsak; Aniwat Kesorn; Pimpa Limthongkul; Nonglak Meethong; Thailand National Energy Technology Center (ENTEC); Udon Thani Rajabhat University; Khon Kaen University; Thailand National Metal and Materials Technology Center; Mahidol University; Synchrotron Light Research Institutewere investigated. The results show that the activation of the Li2MnO3component was controlled by the cycling rate. A high cycling rate effectively reduced the Li2MnO3activation and spinel phase evolution, bringing about better cycling stabilityItem Metadata only Synergistic effect of Al doping and sol-gel synthesis on the photocatalytic degradation of ciprofloxacin(2025-01-01) Yasar M.; Kadhem A.A.; Fatima K.; Sajid M.; Ullah M.N.; Sattar A.; Abbas M.; Riaz A.; Ashraf S.; Yasar M.; Mahidol Universityas the structural, optical, surface area, and morphological properties of Mn0.3Ba0.4Cd0.3AlxFe2-xO4 (x = 0.0, 0.5) spinel ferrites. and their subsequent photocatalytic performance for ciprofloxacin degradation. The Al-doped ferrite achieved a 93.45% degradationItem Metadata only Synthesis, characterization, and mechanistic insights into enhanced photocatalytic tetracycline degradation by zinc-doped ferrite nanoparticles(2026-03-01) Celik C.; Yasar M.; Alzahrani K.J.; Abbas M.; Ganesan S.; Mujtaba A.; Mishra S.; Sharma J.; Sinha A.; Alzahrani F.M.; Celik C.; Mahidol University.3915 Å), indicating successful Zn incorporation into the spinel structure. BET analysis showed an increase in the surface area (18.86 to 43.75 m²/g) and pore volume (0.039 to 0.088 cm³/g) with increasing Zn concentration in the catalyst. Remarkably