Degui Li

Thermal Expansion, Magnetic and Electrical Properties of Ternary Compound DyCo0.67Ga1.33

The ternary compound DyCo0.67Ga1.33 was synthesized and the thermal expansion of DyCo0.67Ga1.33 was studied in the temperature range of 309–608 K by high temperature powder X-ray diffraction technique. The volumetric coefficient of thermal expansion, , can be represented by . Its magnetic properties were measured between 30 and 300 K, and the magnetic susceptibility of DyCo0.67Ga1.33 was found to follow the Curie–Weiss law in the temperature range of 40–300 K. The effective magnetic moment and paramagnetic Curie temperature were estimated to be 9.86 μB and 40.4 K, respectively. Electrical resistivity of the compound DyCo0.67Ga1.33 was also measured between 5 and 300 K. Temperature variation of the electrical resistivity suggests the metallic character of the compound DyCo0.67Ga1.33 with an anomaly detected at 45 K. The residual resistivity ratio RRR of the compound is about 1.2.

X-Ray Powder Diffraction Data and Crystal Refinement of a New Compound AlCrNi3Pr

Rare earth-transition metal (R-T) intermetallics have been well used because of their excellent properties. The X-ray diffraction patterns of many new phases in the R-T system have not been extensively studied. A new compound AlCrNi3Pr was prepared by arc melting using non-consumable tungsten electrode under argon atmosphere, and then annealed at 1023K for 30 days. The X-ray powder diffraction data of AlCrNi3Pr was collected on a Rigaku SmartLab X-ray powder diffractometer. The powder patterns of the compound were indexed, and the structure refinement by using Rietveld method indicated that the AlCrNi3Pr compound crystallized in the hexagonal structure, space group P6/mmm (No.191) with PrNi5 structure type, a=b=5.0553(9) Ǻ, c=4.0763(6) Ǻ, V=90.22Ǻ3, Z=1, ρx=7.288g cm-3, the Smith–Snyder FOM F30=279.1(0.0044, 32) and the intensity ratio RIR=1.23.

Crystal Structure of Al2Cu3Nd Ternary Compound

A new Al-Cu-Nd system alloy, the high-purity Al2Cu3Nd ternary compound, was developed and prepared with the stoichiometric amounts of elemental constituents by arc melting under argon atmosphere. The X-ray diffraction (XRD) data of Al2Cu3Nd was collected by using the Rigaku Smart Lab X-ray powder diffractometer, and all X-ray diffraction peaks of Al2Cu3Nd compound were indexed successfully with the hexagonal structure. The Rietveld refinement results of the XRD pattern for the Al2Cu3Nd compound showed that the Al2Cu3Nd compound is the hexagonal structure, space group P6/mmm (No.191) with a = 5.2397(1) Å, c = 4.1783(1) Å, V = 99.34 Å3, Z = 1. The density of the compound was 6.501 g/cm3, and its reference intensity ratio (RIR) w 1.26.

The Preparation and Properties of SiO2-Al2O3 Composite Fluoride Removal Agent

The fluoride removal agents of SiO2-Al2O3 spherical particles were prepared using aluminum powder and sodium silicate as the main raw material by sol-gel method. The samples were characterized by XRD analysis method, and several influencing factors of fluoride removal performances had been studied, such as the content of SiO2, calcinations temperature, calcinations time, pH values, etc. The results showed that the adsorption capacity of SiO2-Al2O3 increased with the content of SiO2 increasing in the range of 0 to 12%. The best calcination temperature is 500 °C, and the best calcination time is 1 hour. The concentration of fluorine could reduce from 190 mg/L to 0.388 mg/L in the environment of pH 5.5 ~ 6, and the adsorption capacity could reach 9.48 mg/g, and the fluoride removal rate could reach 99%.

The Crystal Structure of the PrAl8Cu3Ni Quaternary Compound

The tetragonal ThMn12-Type RT4Al8 (R=rare earth metal, T=transition metal) compounds received serious attention in recent years due to these compounds display a wide variety of magnetic properties depending on the kinds of R and T elements [1]. Among them CeCu4Al8 has been reported [2] to exhibit such heavy fermion like behavior that the specific heat divided by temperature C/T attains a large T→0 value of 0.3J/K2mol with abroad maximum of 0.95J/K2mol at Tmax= 1.1K without showing magnetic ordering down to 30 mK,and the characteristic temperature (Tk) was estimated to be about 6K from the low-temperature broad maximum of the electrical resistivity [3]. Mossbauer spectroscopy, magnetization and AC-susceptibility measurements performed on DyFexAl12_x(4≤ x≤ 4.7) polycrystalline samples (ThMn12-type structure), revealed a complex magnetic behaviour dependent on applied field, temperature and composition [4]. To the best of our knowledge, quaternary intermetallic compound PrAl8Cu3Ni have not been reported in literature. This work reports on the crystal structure of PrAl8Cu3Ni.

The X-ray powder diffraction data for CeCo 3 Ni 2

The CeCo 3 Ni 2 compound was synthesized by arc melting under argon atmosphere. High-quality powder X-ray diffraction (XRD) data of CeCo 3 Ni 2 have been collected using a Rigaku SmartLab X-ray powder diffractometer. The refinement of the XRD pattern for the CeCo 3 Ni 2 compound shows that the CeCo 3 Ni 2 is a hexagonal structure, space group P 6 /mmm (No.191) with a xa0=xa0 b xa0=xa04.9081(2)xa0A, c xa0=xa04.0034(2)xa0A, V xa0=xa083.52xa0A 3 , Z xa0=xa01, and ρ x xa0=xa08.6347xa0gxa0cm −3 . The Smith–Snyder FOM F 30 xa0=xa0112.7(0.0089, 30) and the intensity ratio RIRxa0=xa00.48.

Powder diffraction data of the PrAlFeNi 3 quaternary compound

A new quaternary compound PrAlFeNi 3 was synthesized and studied by means of X-ray powder diffraction technique. The powder pattern of PrAlFeNi 3 was indexed and refined, giving a hexagonal structure, space group P 6/mmm (No. 191) with the CaCu 5 structure type, a xa0=xa05.1132(2)xa0A, c xa0=xa04.0737(1)xa0A, V xa0=xa092.19xa0A 3 , Z xa0=xa01, ρ x xa0=xa07.20xa0gxa0cm −3 , F 30 xa0=xa0173.61 (0.0054, 32) and RIRxa0=xa00.77.