The various JCPDSs in the same phases of a compound are due to grain orien- tations of JCPDS = structures, for example: = 22–1107; (311), (220) the for JpCrPinDcSip =le 7Z3n–C19r26O2;4 grain orientations are: (311), and (220), (311), (511), (...
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18、图 2-1 -al2o3加热时密度变化曲线 + + empty hale al3+ o2- 图 2-2 -al2o3晶体结构 与 al2o3生成液相。 第一类为变价氧化物,如 tio2、cr2o3、mno2等。由于其晶格常数与 al2o3接近,因此通常能与 al2o3形成固溶体。同时由于变价作用而使 al2o3产 生缺陷,活化晶格,促进了 al2o3的烧...
Identify the oxidizing agent in the following redox reaction CH4 + 2O2 \rightarrow CO2 +2H2O For the reaction below, identify the oxidizing agent: K_2{Cr}_2O_7 + {SnCl}_2 + {HCl} rightarrow {CrCl}_3 + {SnCl}_4 + ...
用Ni-CeO2复合电镀后包埋渗Cr的方法在低碳钢上制备了CeO2改性的渗Cr涂层.在900℃、含与不含0.1%SO2的5%O2+N2气氛中,与低碳钢渗Cr及镀Ni渗Cr涂层的氧化行为进行了对比研究,获得如下结果(1)CeO2改性的渗Cr涂层抗高温氧化性能最好,低碳钢渗Cr涂层最差;(2)SO2促进了碳钢
catalysts Article Effect of the Cr2O3 Promoter on Pt/WO3-ZrO2 Catalysts for n-Heptane Isomerization Guangxiang He 1,2 , Rongrong Zhang 1,2, Qian Zhao 1,2, Suohe Yang 1,2, Haibo Jin 1,2,* and Xiaoyan Guo 1,2,* 1 Department of Chemical Engineering, Beijing Institute of Petrochemical ...
111020 Moscow, Russia * Correspondence: volkova@geol.msu.ru Abstract: In this work, isothermal sections of the Ln2O3–Cr2O3–B2O3 (Ln = Gd–Lu) ternary oxide systems at 900, 1000, and 1100 ◦C were constructed by determining the phase relations by using a powder X-ray diffraction te...
This splitting of the d-orbitals is the origin of the red color of the Cr-doped Al2O3. At low temperatures, a Cr3+ ion is being squeezed into an octahedral cage of O2− ions, which is too small. At high temperatures, the chemical bonds in this compound expand, and the Cr3+ ions...
Hence, the purpose of the present work can be divided into two main goals: (1) to demonstrate that laser technology can be used to process Al2O3 and Cr2O3 powders to obtain chromium-doped crystalline α-Al2O3 spheres in air atmosphere simply and promptly, without the need of expensive...
As shown in Figure 8f, unlike the CrMnFeCoNi alloy, O1s spectrum of the CoCrFeMnNi with 2.5 wt.% WC alloy is composed of O2−, OH−, and H2O, which correspond to metal oxides and hydroxides in the passivation film. H2O may be the binding water formed in the passivation film [45...