PubMed İndeksli Yayınlar Koleksiyonu / PubMed Indexed Publications Collections

Permanent URI for this collectionhttps://hdl.handle.net/20.500.13091/5

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Citation - WoS: 1
Citation - Scopus: 1
Novel Smart Materials With High Curie Temperatures: Eu_1.90 Dy_0.10ge_{2< , Eu_1.90 La_0.10ge_{2< and Eu_1.90 Ho_0.10 Ge₂ O₇}}
(Pergamon-elsevier Science Ltd, 2025) Ozturk, Esra; Ozpozan, Nilgun Kalaycioglu; Kalem, Volkan
The Eu-1.90 Dy0.10Ge2O7 , Eu-1.90 La0.10Ge2O7 and Eu-1.90 Ho-0.10 Ge-2 O-7 powder were obtained through a solid-state reaction method via multistep firing of stoichiometric ratios of Eu2O3, GeO2, Dy2O3, La2O3 and Ho2O3 in open atmosphere at temperatures from 800 to 1150 degrees C. The thermal behaviour, phase formation, SEM/EDX analysis, photoluminescence properties, Curie tempereture, dielectric and piezoelectric properties of the samples were investigated by TG/DTA, XRD, SEM, PL, TG/DTA, LCR-meter and d33-meter, respectively. The germenates having triclinic crystal system have D-5(0)-> F-7(4), D-5(0)-> F-7(3), D-5(0 )-> F-7(2), 5D0 -> 7F1 transitions of Eu(3+)ions. Also, the photoluminescent germenates show electrical properties and the piezoelectric charge constant of germenates showed Eu1.90Dy0.10Ge2O7>Eu1.90Dy0.10Ge2O7 >Eu1.90La0.10Ge2O7 trend. The Curie temperature of Eu1.90Dy0.10Ge2O7, Eu1.90Dy0.10Ge2O7 and Eu1.90Dy0.10Ge2O7 are 825, 844 and 838 degrees C, respectively. Compared to commonly used piezoelectric materials, Eu1.90Dy0.10Ge2O7, Eu1.90Dy0.10Ge2O7 and Eu1.90Dy0.10Ge2O7 materials with very high Curie temperatures were obtained with photoluminescent properties.
Citation - WoS: 5
Citation - Scopus: 7
Variations of 222rn Concentrations Over Active Fault System in Simav, Kütahya, Western Turkey: Possible Causes for Soil-Gas 222rn Anomalies
(Elsevier Ltd, 2022) Manisa, Kaan; Erdoğan, Mehmet; Zedef, Veysel; Bircan, Hasan; Biçer, Aahmet
Soil-gas 222Rn concentrations were investigated on an active Simav Graben/Fault System in Western Turkey. Measurements to understand the causes of variations in soil-gas 222Rn were conducted in three distinct sections such that seven selected measurement points in each section lie on a line that is approximately perpendicular to the main fault line. It was found out in each section that values obtained at two adjacent points were abnormally higher than the rest. The corresponding concentrations were measured as 60.76–63.93 kBq/m3, 33.00–45.78 kBq/m3, and 56.20–84.69 kBq/m3 on the first, second, and third lines, respectively. These values, which differ significantly from measurements conducted on a similar line, are thought to be stemming from crustal stress caused by faulting or acidic-intrusive rocks in the region. © 2022 Elsevier Ltd

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