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AbstractAbstract
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Original Title
Issledovanie vzaimodejstviya nitratov redkozemel'nykh ehlementov s ftoridom natriya v rasplave NaNO3
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in the summary form only.
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Journal Article
Journal
Izvestiya Akademii Nauk SSSR, Neorganicheskie Materialy; v. 7(10); p. 1876-1877
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[en] The present work reports on the influence of CO2 on the chemical constitution and catalytic properties for the oxidative dehydrogenation of ethane (OXDE) of the praseodymium oxide (Pr6O11. When the reaction is run in a flow of He praseodymia behaves like ceria, whereas in a flow of CO2 its behaviour is closer to that of lanthana. In the latter case, Pr(III) ions become stabilized as monocarbonate dioxide (Pr2O2CO3), thus explaining the differences of selectivity observed between reducible rare earth oxides, and the sesquioxides or CO2 treated praseodymia
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Conference on New Developments in f-Elements; Leuven (Belgium); 4-7 Sep 1990
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Journal Article
Literature Type
Conference
Journal
European Journal of Solid State and Inorganic Chemistry; CODEN EJSCE; v. 28(Suppl.); p. 421-424
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Eyring, L.; Summerville, E.; Skarnulis, A.J.
Arizona State Univ., Tempe (USA). Dept. of Chemistry1975
Arizona State Univ., Tempe (USA). Dept. of Chemistry1975
AbstractAbstract
[en] Electron microscope images obtained at about 3A resolution for Pr7O12 (and isomorphous Zr3Sc4O12) are in excellent agreement with calculated images based upon the structure determined separately by total profile neutron powder diffraction analysis. The image calculation programs establish the efficacy of lattice image interpretation in structural terms for these types of related phases whose structures are as yet beyond conventional means to determine. Such images for several other intermediate phases are interpreted and structures proposed. Finally, images of crystals which can be made to undergo reaction within the microscope are interpreted according to the structures involved. These studies reveal the role of intergrowth and topotaxy in these systems
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Source
1975; 121 p; Available from NTIS; Available from NTIS. $5.50.
Record Type
Report
Literature Type
Progress Report
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AbstractAbstract
No abstract available
Original Title
Oksid prazeodima (4) PrO2
Primary Subject
Source
Brauehr, G. (ed.); p. 1178-1180; 1985; p. 1178-1180; Mir; Moscow (USSR); Short note; 6 refs.; translated from Germany.
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Book
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Davis, H.L.; Mook, H.A.
Oak Ridge National Lab., Tenn. (USA)1972
Oak Ridge National Lab., Tenn. (USA)1972
AbstractAbstract
No abstract available
Source
1972; 5 p; 18. annual conference on magnetism and magnetic materials; Denver, CO; 28 Nov 1972
Record Type
Report
Literature Type
Conference
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INIS IssueINIS Issue
Thiyagarajan, R.; Manivannan, N.; Esakkimuthu, S.; Arumugam, S.; Tamilselvan, N.R.; Yoshino, H.; Murata, K.; Prabakaran, D.; Boothroyd, A.T., E-mail: sarumugam1963@yahoo.com
Proceedings of the international conference on high pressure science and technology: abstracts2011
Proceedings of the international conference on high pressure science and technology: abstracts2011
AbstractAbstract
[en] Doped manganites with bilayer structure La2-2xSr1+2xMn2O7 have attracted the considerable interest by having more than one physical phenomena such as broad metallic region, Jahn-Teller distortion, etc. Keeping the hole concentration at x = 0.4 in La1.2Sr1.8Mn2O7, the doping of 60 % small ionic radius Pr3+ (1.126 A) on the larger La3+ (1.160 A) site, Viz. (La1-zPrz)1.2Sr1.8Mn2O7, which causes the mismatch in the cationic size, in turn modifies the crystal field. Hence, (La0.4Pr0.6)1.2Sr1.8Mn2O7 (LPSMO) becomes an insulator for all range temperature. Gordon et al., studied the effect of magnetic field on LPSMO and found the first-order insulator-metal transition at 50K and it is increased as 100K, 125K, 150K by further increase of field. The magnetic field and hydrostatic pressure has the same nature on manganites of making the more ferromagnetic metal due to the enhancement of interlayer coupling by ferromagnetic double exchange phenomena through favoring of 3dx2-y2 states with respect to 3dz2-r2. In this paper, we have carried out a systematic investigation of hydrostatic pressure effect on the insulating state of (La0.4Pr0.6)1.2Sr1.8Mn2O7 system
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Source
International Association for the Advancement of High Pressure Science and Technology, Mumbai (India); Materials Research Society of India, Mumbai Chapter, Mumbai (India); Board of Research in Nuclear Sciences, Department of Atomic Energy, Mumbai (India); Defence Research and Development Organisation (India); 416 p; 2011; p. 173; AIRAPT-23: 23. international conference on high pressure science and technology; Mumbai (India); 25-30 Sep 2011; 3 refs., 1 fig.
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Book
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Conference
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AbstractAbstract
[en] To study the electronic structure of CeP crystal (and its two analogs) a cluster approach, realized within the framework of the scattered waves Xα (MSXα) with a local exchange operator and MT-approximation for density and potential, is used. Due to additions, introduced into the calculation program according to the MSXα, ions charges have been correlated depending on their values, obtained as a result of the MSXα procedure. The reasonable parameter values of crystal fields of the fourth and sixth orders are determined
Original Title
Ehlektronnye sostoyaniya v regulyarnykh sistemakh ReP (Re = Ce, Pr, Nd)
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Journal Article
Journal
Vestnik Leningradskogo Universiteta, Fizika, Khimiya; ISSN 0024-0826;
; CODEN VLUFB; (no.3); p. 96-98

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AbstractAbstract
[en] The mixing method was used in the temperature range 400--22000K to conduct the first systematic study of the enthalpy of sulfides of the praseodymium-sulfur system. Temperature dependences of the enthalpy, heat capacity, entropy, and corrected Gibbs energy of the investigated compounds were obtained and are recommended for practical use. It was established that enthalpy and heat capacity decrease from PrS to PrS2 due to an increase in the degree of covalence of the sulfides with an increase in the ratio [S]/[Pr]
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Transl.: Cover-to-cover translation of Teplofizika Vysokikh Temperatur (USSR).
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Journal Article
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Translation
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AbstractAbstract
[en] Method of X-ray diffraction analysis was used to investigate the structure of praseodymium oxide films, prepared by Pr6O11 vacuum precipitation. Formation of nonstoichiometric PrO1.83-x phase, A- and C- forms of Pr2O3, depending on precipitation temperature was established. Precipitation temperature, leading to formation of equilibrium Pr2O3 structure in films, is equal to 900 deg C
Original Title
Strukturnye prevrashcheniya oksida prazeodima v plenkakh
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AbstractAbstract
[en] Published in summary form only
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