Search results for "Cation distribution"

Cation Distribution in Ferrites with Spinel Structure Measured by Anomalous Powder Diffraction

1998

Temperature dependence of oxidation behavior and coercivity evolution in fine-grained spinel ferrites

2000

Abstract The present paper reviews for a series of fine-grained MxCoyFe(3−x−y)O4 spinel ferrites (M=Mn, Mo, Cu, V) which oxidize into mixed-valence defect ferrites, a systematic study of the correlation between the oxidation temperature and the variation of coercivity. An increase of the coercivity is observed as often as the oxidation reactions Fe2+→Fe3+ and Mn+→M(n+m)+ (1⩽m⩽3) occur. This enhancement of coercivity has been explained by stresses generated during each specific oxidation reaction. The well-known property of cobalt to strongly magnify the magnetostrictive effects has been used to support this interpretation.

Crystal Chemistry of CdIn2S4, MgIn2S4, and MnIn2S4 Thiospinels under High Pressure

2012

We report X-ray diffraction measurements in CdIn2S4, MgIn2S4, and MnIn2S4 thiospinels at room temperature and high pressures. The pressure dependences of the structural parameters have been determined and compared to those from theoretical calculations. It is found that the three thiospinels have similar bulk moduli (B-0) between 75 and 80 GPa (B-0' similar to 3). The degree of inversion of these thiospinels has also been determined. The three thiospinels undergo a phase transition toward a defect LiTiO2-type structure above 9.5, 8.3, and 6.8 GPa in CdIn2S4, MgIn2S4, and MnIn2S4, respectively. Interestingly, the low- and high-pressure phases belong to the same symmetry group (Fd-3m), the tr…

Mobilās lietotnes izstrāde un izplatīšana

2016

Diplomdarba temata nosaukums ir "Mobilās lietotnes izstrāde un izplatīšana". Darba mērķis ir izstrādāt projektu mobilai lietotnei ar kuras palīdzību būtu iespējams veikt muzikālās dzirdes attīstības vingrinājumus. Darbā tiek analizēta muzikālās dzirdes attīstības vingrinājumu veikšanas iespējas ar mobilās lietotnes palīdzību. Tiek analizētas mobilo iekārtu tehniskās iespējas, vingrinājumu veikšanas procesu analīze un to uzlabošanas iespējas, kā arī izplatīšanas īpatnības. Darba rezultāta izveidots projekts ar lietotnes koncepciju, dekompozīcijas, datu, lietotāju saskarņu un izplatīšanas aprakstiem.