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| 1 | Effect of thulium substitution on conductivity and dielectric belongings of nanospinel cobalt ferrite显示文摘The CoTmx Fe2-x O4(x≤0.1) NPs were synthesized sonochemically.X-ray powder diffraction patterns and TEM images of the samples prove their chemical purity and cubic structure-morphology,respectively.Some substitution ratio of thulium ions to cobalt ferrites have an important effect on the characteristic evaluation of both electrical and dielectric characteristic measured at frequencies up to 3.0 MHz between room temperature and 120℃.Since the thulium substitution has a very strong effect on the characteristic evaluation of both electrical and dielectric properties of cobalt-ferrite samples,four substitutio nal ranges-none,small,medium and high were determined for the interpretation of contribution of thulium ratio to ac/dc conductivity,dielectric constant,dielectric loss and tangent loss.Conductivity increases with the incremental frequencies,in general depending on a variety of tendencies of both temperature and substitutional Tm ratios while the activation energy varies with a high dependency to the regional level of Tm substitution in Co-ferrites NPs.The Arrhenius graph appears to provide us with a single activation energy much higher than 400 meV for x=0.02,which can be attributed to electron hopping mechanisms,apart from other substituted spinel ferrites. | B.Unal M.A Almessiere A.Demir Korkmaz Y.Slimani A.Baykale | 2020 | Journal of Rare Earths2020，38，10： | 2 |
| 2 | 纳米CoFe_2O_4与Al/CoFe_2O_4的制备及对RDX热分解性能的影响显示文摘采用水热法制备出纳米CoFe2O4颗粒,再通过超声混合法制备出Al/CoFe2O4混合物,用X射线粉末衍射(XRD)和扫描电子显微镜-能谱仪(SEM-EDS)测试了其成分和形貌特征。按CoFe2O4或Al/CoFe2O4与RDX质量比1∶4、通过超声混合法分别制备出CoFe2O4/RDX、Al/CoFe2O4/RDX样品,并用差示扫描量热法(DSC)研究了CoFe2O4和Al/CoFe2O4对RDX热分解的影响。结果表明,纳米CoFe2O4和Al/CoFe2O4的加入不会改变RDX热分解过程遵循的最可几机理函数,但混合物的热分解峰温明显降低;且CoFe2O4/RDX和Al/CoFe2O4/RDX混合体系的表观活化能相对于RDX有所降低,说明CoFe2O4和Al/CoFe2O4的加入促进了RDX的分解。 | 王通 赵宁宁 李嘉辰 赵凤起 马海霞 | 2015 | 火炸药学报2015，38，5： | 0 |
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