Electric Quadrupole Interaction at Ta in Isostructural Orthorhombic Cu8Hf3 and Cu8Zr3 Compounds*
ثبت نشده
چکیده
The quadrupole interaction of Ta probes in isostructural C u 8 H f 3 and C u 8 Z r 3 intermetallic compounds was studied in the temperature range 24 K -1100 K with the time-differential perturbed angular correlation technique. Two nonaxial electric field gradients corresponding to two nonequivalent hafnium or zirconium sites in the investigated structure were found. A linear decrease in the quadrupole interaction frequency with increase of temperature for the 8(d) sites was evidenced, while the vQ(T) dependence for the 4(c) sites is weaker and has a T character.
منابع مشابه
Topological relationship between electric quadrupole, hexadecapole moments, energy and Padmakar–Ivan index in armchair polyhex nanotubes TUVC6[2p,q]
The electric quadrupole, hexadecapole moments, energy (kJmol -1) for some armchair polyhex carbon nanotubes TUVC6[2p,q] are performed by Beck-Lee-Yang-Parr [B3LYP] on 3-21G basis set using the standard procedure indices GAUSSIAN 98, then the Padmakar-Ivan (PI) index of TUVC6[2p,q] nanotubes in the terms of their circumference (2p) and lengh (q) is calculated and the relationships between the Pa...
متن کاملPolymorphism of LaTaTiO6.
Two polymorphs of LaTaTiO6, i.e. monoclinic and orthorhombic, were synthesized by solid-state reaction technique. Both were found to be isostructural with analogous niobium compounds which were used as structural models. Structural characterization was performed on X-ray powder data by Rietveld refinement procedure which resulted in final Rwp values of 7.01 and 7.52% for orthorhombic and monocl...
متن کاملElectric Field Gradients at the In Site in Au-In Compounds *
Interface compound studies on the Au-In system [1,2] have shown that Auln 2 is formed below and around room temperature. Auln2 exhibits a CaF2 structure of cubic symmetry leading to a vanishing electric field gradient (EFG) at the lattice sites. Application of the perturbed angular correlation (PAC) method to detect the other intermetallic compounds formed in the interface region at elevated te...
متن کاملSyntheses, Crystal Structures, and Optical and Magnetic Properties of Some CsLnCoQ3 Compounds (Ln = Tm and Yb, Q = S; Ln = Ho and Yb, Q = Se)
The four new compounds CsTmCoS3, CsYbCoS3, CsHoCoSe3, and CsYbCoSe3 have been synthesized at 1123 K. These black-colored isostructural compounds crystallize in the KZrCuS3 structure type with four formula units in space group Cmcm of the orthorhombic system. The structure of these compounds is composed of 2 [LnCoQ3 ] layers separated by Cs atoms. Because there are no Q Q bonds, the formal oxida...
متن کاملs . at om - p h ] 3 0 Ja n 20 06 ELECTRIC QUADRUPOLE MOMENT OF A HYDROGENLIKE ION IN s AND p 1 / 2 STATES
Relativistic formulas for the electric quadrupole moment of a hydrogenlike atom, induced by the hyperfine interaction, are derived for ns and np1/2 states. Both the magnetic dipole and electric quadrupole hyperfine interactions are taken into account. The formulas are valid for ions with arbitrary nuclear charge and spin. The induced quadrupole moment is compared with the nuclear quadrupole mom...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2012