17 Result(s)

Article

Magnetic phase transitions in Fe_80-xNi_xCr₂₀ (14 ⩽ x ⩽ 30) alloy studied by using ⁵⁷Fe Mössbauer spectroscopy

This paper reports ⁵⁷Fe Mössbauer spectroscopic studies of the polycrystalline samples of the substitutionally disordered, isostructural (fcc), ternary alloy system Fe_80-xNi_xCr₂₀ for x = 30, 26, 19 and 14 in the ...

D. Bandyopadhyay, R.M. Singru, A.K. Majumdar in Hyperfine Interactions (1999)

Article

Effect of Annealing on the Hyperfine Field Distributions in Fe79B16Si5 and Fe78B13Si9 Metallic Glasses

D. Bandyopadhyay, R. M. Singru in Journal of Materials Science Letters (1998)

Article

Mossbauer spectroscopic study of heat-treated and control-cooled Fe3Al alloys

The Fe–Al system forms a model object of transition metal-sp element system. Fe–Al alloys containing 21–31 at% Al are known to exhibit several attractive physical properties which render them candidate materia...

D Bandyopadhyay, S Suwas, R. M Singru, S Bhargava in Journal of Materials Science (1998)

Article

Positron annihilation lifetime study of hydrogen-charged Al-Al₂O₃ composites

B. Haldar, R. Balasubramanian, R. M. Singru in Journal of Materials Science Letters (1996)

Article

Phase-precipitation studies of Fe-B-Si metallic glasses using Mössbauer spectroscopy

Phase-precipitation studies have been performed on samples of the metallic glasses Fe₇₉B₁₆Si₅ and Fe₇₈B₁₃Si₉, heated in the range 300–475 °C for various times (1–16 h) using ⁵⁷Fe Mössbauer transmission spectrosco...

N. Banerji, U. C. Johri, V. N. Kulkarni, R. M. Singru in Journal of Materials Science (1995)

Article

Mössbauer spectroscopic studies of the crystallization of amorphous Fe₈₀B_20−xSi_x (x=0, 2, and 8) alloys

The crystallization process of amorphous Fe₈₀B_20−xSi_x (x=0, 2, and 8) ferromagnetic alloys has been studied by using ⁵⁷Fe Mössbauer spectroscopy and X-ray diffraction studies. Results for samples heat treated at ...

R. Singhal, U. C. Johri, R. M. Singru in Journal of Materials Science (1993)

Article

Mössbauer spectroscopic studies of glass ceramics with hexagonal barium and strontium ferrites

Mössbauer spectroscopic studies have been performed on glass ceramics in which barium and strontium hexaferrites have been crystallized as a major magnetic phase. The crystallization process of the different m...

U. C. Johri, R. M. Singru, D. Bahadur in Journal of Materials Science (1992)

Chapter and Conference Paper

Positron studies of fermi surfaces in metals

R. M. Singru in Electronic Band Structure and Its Applications (1987)

Article

Mössbauer spectroscopic studies of Y_3−x Gd _x Fe₅O₁₂(x =0, 0.5 and 3.0) prepared by an amorphous citrate process

The system Y_3-x Gd _x Fe₅O₁₂(x = 0, 0.5 and 3.0) synthesized through an amorphous citrate gel process has been investigated by Mössbauer and EPR spectroscopy. These studies deline...

D. Bahadur, Virendra Kumar, R. M. Singru in Journal of Materials Science (1986)

Article

Mössbauer studies of the effect of nucleating agents on the crystallization of YIG in the Na₂O-SiO₂-Y₂O₃-Fe₃O₃ glass system

The effect of 2 mol % of P₂O₅ or TiO₂ on the crystallization of yttrium-iron-garnet (YIG) in Na₂O-SiO₂-Y₂O₃-Fe₂O₃ glass ceramics has been investigated by X-ray and Mössbauer spectroscopic studies. These studies i...

A. Prasad, R. M. Singru, D. Bahadur, D. Chakravorty in Journal of Materials Science (1984)

Article

Study of Na₂O-SiO₂-Fe₂O₂-Y₂O₃ glass by Mössbauer and EPR spectroscopy

Mössbauer, EPR and magnetization experiments have been carried out on the glass composition Na₂O-SiO₂-Fe₂O₂-Y₂O₃ in which yttrium iron garnet (YIG) can be precipitated by suitable heat-treatment. The measurements...

Akhilesh Prasad, D. Bahadur, R. M. Singru, D. Chakravorty in Journal of Materials Science (1982)

Article

Effect of bcc-fcc phase transition on the compton profiles of iron

The effect of theα-γ or bcc-fcc phase transition on the electron momentum distribution and Compton profiles of iron has been theoretically examined by a band structure calculation in the two phases. The calculate...

K. R. Krishna Gandhi, R. M. Singru in Applied Physics A (1982)

Article

Momentum and spin density in magnetite

Measurements are reported of the angular correlation of annihilation radiation from polarized positrons in single crystals of Fe₃O₄. No change has been found in the angular correlations on passing through the met...

P. E. Mijnarends, R. M. Singru in Applied physics (1974)

Article

Positron angular correlation in copper

The two photon pair momentum density and the angular correlation curves for positron annihilation radiation from copper have been obtained by a band structure calculation, employing Hubbard’s approximation sch...

R M Singru in Pramana (1974)

Chapter

Positron Annihilation in Solids

Positron is the antipartie le of electron and its existence was predicted “by Dirac’s relativistic theory of electron. Positrons were experimentally discovered “by Anderson in cloud chamber photographs of cosm...

R. M. Singru in Modern Aspects of Solid State Chemistry (1970)

Article

On the decay of¹²⁹Cs

The radiations from the decay of¹²⁹Cs have been investigated by β-ray spectrometer and coincidence scintillation spetrometer. New γ-rays of 790 and 920 keV have been detected. The conversion coefficients of the γ...

S. Jha, H. G. Devare, R. M. Singru in Il Nuovo Cimento (1955-1965) (1960)

Article

On the decay of xenon 133

The γ-rays from¹³³Xe have been studied in a scintillation spectrometer. The γ-rays have the energy of 80 keV, 160 keV, 300 keV and 380 keV with the relative intensity 1, 1.4 · 10⁻², 8.4 · 10⁻⁴ and 4.3 · 10⁻⁴. By ...

S. Jha, H. G. Devare, M. Narayana Rao, R. M. Singru in Il Nuovo Cimento (1955-1965) (1959)