Structure and magnetism of copper substituted cobalt ludwigite Co₃O₂BO₃

The single crystals Co₃O₂BO₃ with partial (4%) substitution of Co by Cu ions were synthesized by the flux technique. X-ray diffraction and magnetic properties investigations were carried out. The x-ray diffraction meas-urements have shown that Cu clearly prefers only one from four nonequivalent crystallographic positions with the smallest electric field gradient. The ferrimagnetic ordering near TN = 43 K and high magnetic hardness in this magnetic phase are similar to Co₃O₂BO₃. The small reduction of the effective magnetic moment was revealed under copper substitution

COMPLEXATION IN THE SYSTEM ZINC (II)-CHROME (III)-NICKEL (II)-GLYCINE-WATER

The relevance of studying complexation in the system under consideration is associated with the development of the role of heteronuclearcompounds in the processes of electrochemical production of alloys. According to the known concepts, in heteronuclear compounds, the more electronegative atom makes a greater contribution to the bonding orbital, and the orbital of the less electronegative atom, to the antibonding one. This contributes to the convergence of the reduction potentials of metal ions present in such a compound and the production of an electrochemical alloy. In addition, it is known that an increase in the effective radius of complex ions, which is characteristic of heteronuclear compounds, decreases the activation energy of their electrochemical reduction. The aim of this work is to obtain data on complexation in the system Zn (II)-Cr (III)-Ni (II)-glycine-water, composition and stability of heteronuclear compounds. The establishment of the composition of the complexes formed in the system under study was preceded by the acquisition of data on the complexation of each of the indicated elements in individual solutions. It was previously established that in the Zn(II)-Cr (III)-glycine-water system in the pH range 1.0-3.5, heteronuclear forms [CrZn(HGly)4Gly4]+ and [CrZn(HGly)2Gly6]− prevail, at pH 2.2 - 4.0, the share of [CrZnGly8]3− accumulation increases. To establish the composition of the resulting complexes, we used pH metric titration and the method of nuclear magnetic relaxation (NMR) of protons in combination with mathematical processing of the results (CPESSP program). The formation of heteronuclear complexes [CrNiZn(HGly)4Gly4]3+, [CrNiZn(HGly)2Gly6]+ was established, their formation constants and the fraction of accumulation (HGly - glycine) were calculated. The results of the work were used in the development of electrolytes for the process of electrochemical alloying of zinc coatings simultaneously with chromium and nickel

Low-temperature magnetic behavior of the rare-earth cobaltites GdCoO 3 and SmCoO3

The temperature and magnetic field dependences of the static magnetization of the polycrystalline rare-earth cobaltites GdCoO3 and SmCoO 3 have been measured. It is shown that, below room temperature, the magnetization of both compounds derives primarily from the rare-earth ion paramagnetism. The GdCoO3 and SmCoO3 compounds have been found to differ substantially in magnetic behavior, which can be traced to differences in their electronic shell structures. The magnetic behavior of GdCoO3 is close to that of an array of free Gd3+ ions, whereas in SmCoO3 the deviation from the free-ion properties is very large because of the Sm3+ ground state being crystal-field split. Van Vleck magnetic susceptibility measurements of SmCoO3 suggest that the splitting is ∼ 10 K. © 2007 Pleiades Publishing, Ltd

Using of bathtubs on the basis of biologically active agents of a phytogenesis for increase of reserve opportunities at the persons who actively takes sports

Recently considerable interest to application in the medical purposes of the preparations based on vegetable raw materials in connection with their low toxicity and considerable therapeutic efficiency has been increased. The research aimed studying of an influence of chestnut bathtubs on a physical state, functional cardiovascular reserves, vegetative nervous systems, a condition of a psycho-emotional background at the persons who are actively playing sports. Material and Methods. Examination of 30 almost healthy students actively (professionally) playing sports was conducted. Results. Application of chestnut bathtubs promoted increase of functional reserves of vegetative nervous system and, therefore, functional reserves of cardiovascular system. Decrease in level of uneasiness and increase of emotional stability and tolerance to a stress was noted. Conclusion. Thus follows that use of chestnut bathtubs promotes increase of level of a physical state and functional reserves of cardiovascular system and vegetative nervous system, and also conducts to improvement of a psycho-emotional condition of the persons who are actively playing sports

Magnetic fields in Proto Planetary Nebulae

The X-ray diffraction, magnetization and electrical conductivity measurements for Gd0.9A0.1CoO3-? (A=Ba, Sr) have been made. The complicated magnetic behavior, including the paramagnetic-ferromagnetic-antiferromagnetic and paramagnetic-ferromagnetic transitions, was found for Ba- and Sr-doped samples. The gradual insulator-metal transitions were observed in a wide temperature range T=600-800 K. The complex magnetic and transport data could be explained on the basis of the structural phase separation. " 2009 Elsevier B.V. All rights reserved.",,,,,,"10.1016/j.jmmm.2008.11.087",,,"http://hdl.handle.net/20.500.12104/42640","http://www.scopus.com/inward/record.url?eid=2-s2.0-61849143325&partnerID=40&md5=90f25c0a8cff31749916101a9d8284bb",,,,,,"9",,"Journal of Magnetism and Magnetic Materials",,"126

Magnetic and transport properties of Gd0.9A0.1CoO3-δ (A=Ba, Sr)

The X-ray diffraction, magnetization and electrical conductivity measurements for Gd0.9A0.1CoO3-δ (A=Ba, Sr) have been made. The complicated magnetic behavior, including the paramagnetic-ferromagnetic-antiferromagnetic and paramagnetic-ferromagnetic transitions, was found for Ba- and Sr-doped samples. The gradual insulator-metal transitions were observed in a wide temperature range T=600-800 K. The complex magnetic and transport data could be explained on the basis of the structural phase separation. © 2009 Elsevier B.V. All rights reserved

Effect of strontium and barium doping on the magnetic state and electrical conductivity of GdCoO3

A coordinated investigation of the magnetic and electrical properties of polycrystalline cobalt oxide compounds CdCoO3, Gd 0.9Ba0.1CoO3, and Gd0.9Sr 0.1CoO3 is carried out. Undoped GdCoO3 reveals a low conductivity; a magnetic moment of 7.4 μB per molecule, which is less than the theoretical value for the Gd3+ ion; and an asymptotic Curie temperature of -6 K. Doping GdCoO3 with barium and strontium to substitution of 10 at. % Gd brings about an increase in the conductivity and magnetic transitions at T = 300 K for Gd0.9Ba 0.1CoO3 and T = 170 K for Gd0.9Sr 0.1CoO3. The magnetization anomalies imply the formation of magnetic clusters. The behavior of the electrical conductivity at high temperatures suggests a variable activation energy. At low temperatures, Mott hopping conduction sets in. © 2007 Pleiades Publishing, Ltd

Effect of small doses of naloxone on the pulsatile secretion of prolactin in the crossbreed ewe during the non-breeding season

A coordinated investigation of the magnetic and electrical properties of polycrystalline cobalt oxide compounds CdCoO3, Gd 0.9Ba0.1CoO3, and Gd0.9Sr 0.1CoO3 is carried out. Undoped GdCoO3 reveals a low conductivity; a magnetic moment of 7.4 ?B per molecule, which is less than the theoretical value for the Gd3+ ion; and an asymptotic Curie temperature of -6 K. Doping GdCoO3 with barium and strontium to substitution of 10 at. % Gd brings about an increase in the conductivity and magnetic transitions at T = 300 K for Gd0.9Ba 0.1CoO3 and T = 170 K for Gd0.9Sr 0.1CoO3. The magnetization anomalies imply the formation of magnetic clusters. The behavior of the electrical conductivity at high temperatures suggests a variable activation energy. At low temperatures, Mott hopping conduction sets in. " 2007 Pleiades Publishing, Ltd.",,,,,,"10.1134/S1063783407080161",,,"http://hdl.handle.net/20.500.12104/41011","http://www.scopus.com/inward/record.url?eid=2-s2.0-34548088088&partnerID=40&md5=e3e41326b40e3f6a7fda1d057dcf655f",,,,,,"8",,"Physics of the Solid State",,"149

First U-Pb age of detrital zircons from sandstones of the upper Emsian Takaty formation of the western Urals with regard to the problem of primary sources of the Uralian diamond Placers

Several alternative points of view currently exist on the origin of the primary sources of diamonds from the Cenozoic Western Urals placers. Some researchers suppose that their economic diamond resource potential is related to diamonds from tuffisitic facies of the mantle kimberlites-lamproites or impact structures. Other researchers suggest that diamonds originated from the eroded sandstones of the Upper Emsian Takaty Formation of the Lower Devonian, which represents ancient (fossil) placers or intermediate reservoirs. It is assumed that these reservoirs collected diamonds from worn kimberlite bodies, which were located in the Urals or on the East European platform (EEP). This paper presents the first U-Pb (LA-ICP-MS) age of detrital zircons from quartz sandstones of the Takaty Formation, which spans a range from 1857.5 ± 53.8 to 3054.0 ± 48.0 Ma. The absence of detrital zircons younger than 1.86 Ga excludes that the structural coMplexes of the Uralian, Fennoscandian, and Sarmatian EEP parts were the provenance areas that supplied the clastic material to the sedimentary basin, which accumulated the Takaty Formation. The similar age of our zircons and ancient crystalline complexes of the Volga-Uralian EEP part allows consideration that it was a single provenance area. If we assume that the diamond resource potential of the Western Urals is completely or partly related to the ancient diamond placers from the Takaty Formation, then the intermediate diamond reservoirs from its structure originated due to redeposition of destruction products of primary diamond-bearing rocks of the Volga-Uralia area. Thus, within the Volga-Uralian part of the EEP basement, we may expect identification of a previously unknown stage of kimberlite formation, which is significantly older than that responsible for the diamond resource potential of the Arkhangel'sk province. © Pleiades Publishing, Ltd., 2014