Results 111 to 120 of about 288,124 (245)

Evidence of ammonium salts in comet 67P as explanation for the nitrogen depletion in cometary comae [PDF]

open access: yesarXiv, 2019
Cometary comae are generally depleted in nitrogen. The main carriers for volatile nitrogen in comets are NH3 and HCN. It is known that ammonia readily combines with many acids like e.g. HCN, HNCO, HCOOH, etc. encountered in the interstellar medium as well as in cometary ice to form ammonium salts (NH4+X-) at low temperatures.
arxiv  

catena-Poly[hemi[bis(4′-phenyl-2,2′:6′,2′′-terpyridine-κ3N)copper(II)] [cuprate(I)-di-μ2-thiocyanato-κ2N:S;κ2S:N]]

open access: yesActa Crystallographica Section E, 2009
Reaction of 4′-phenyl-2,2′:6′,2′′-terpyridine (phtpy), copper acetate hydrate and ammonium thiocyanate under solvothermal conditions led to the formation of the title compound, {[Cu(C21H15N3)2][Cu2(NCS)4]}
Wen-Juan Shi
doaj   +1 more source

Meteoritic Tutton salt, a naturally inspired reservoir of cometary and asteroidal ammonium [PDF]

open access: yesarXiv
The lack of benchmark data on the real minerals, native ammonium carriers in Solar System gives rise to controversial opinions on extraterrestrial ammonium reservoirs. We herein report on discovery of the first mineral carrier of meteoritic ammonium and show its relevance to the compositional and spectral characteristics of cometary and asteroidal ...
arxiv  

Calculation of the bulk modulus of mixed ionic crystal NH_4Cl_{1-x}Br_x [PDF]

open access: yesarXiv, 2017
The ammonium halides present an interesting system for study in view of their polymorphism and the possible internal rotation of the ammonium ion. The static properties of the mixed ionic crystal NH$_4$Cl$_{1-x}$Br$_x$ have been recently investigated, using three-body potential model (TDPM) by the application of Vegard's law.
arxiv  

Reentrant superconductivity in a composite formed by YBa$_2$Cu$_3$O$ _{7-δ}$ and Ammonium Terbium Oxalate [PDF]

open access: yesarXiv, 2017
We present a study of reentrant behavior in a composite formed by a Hight-T$ _{c} $ superconductor, YBa$_2$Cu$_3$O$ _{7-\delta}$ and Ammonium Terbium Oxalate, Tb(H$_2$O)(C$ _2$O$_4$)$_2$ $\cdot $NH$_4$. The composite has a transition temperature about 92 K, and it presents a reentrant behaviour resulting of the coexistence between superconductivity and
arxiv  

Copper(II) complexes with 1-methyltetrazole: new method for synthesis and properties

open access: yesЖурнал Белорусского государственного университета: Химия, 2017
A new approach for synthesis of copper(II) complexes with 1-methyltetrazole based on oxidative dissolution of metallic powdercopper in ethanol – HCl (ammonium thiocyanate) was developed. Composition and structure of the complexes prepared were studied by
Andrey N. Bogatikov   +2 more
doaj  

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