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Undercooling studies on dispersed bismuth droplets

Chaubey, S.; Singh, V.; Ramachandrarao, P. (Springer India, 1987-11)

In the zinc-bismuth system, a monotectic reaction occurs at 689 K and 0·6 at.% Bi composition. Rapid solidification of the as-cast monotectic alloy led to a micromorphology in which bismuth was uniformly and bimodally ...
Electrical conduction in the solid solution La1 -x Na x Co1 -x Nb x O3 (0·01 ≤x ≤ 0·99)

Parkash, O.M.; Kumar, D.; Kumar, R. (Springer India, 1988-05)

Seebeck coefficient and DC resistivity of the solid solution La1 -x Na x Co1 -x Nb x O3 (0·01 ≤x ≤ 0·99) have been measured in the temperature range 300-900 K. Seebeck coefficient is positive for all compositions over the ...
Preparation and characterization of Ca1 -x La x Ti1 -x Co x O3 (0·00

Parkash, O.M.; Durga Prasad, Ch.; Kumar, D. (Springer India, 1988-09)

The possibility of the formation of solid solution in the system Ca1 -x La x Ti1 -x Co x O3 for x≤0·5 has been investigated. X-ray diffraction studies show that compositions with x=0·05, 0·1, 0·2, 0·3 and 0·5 prepared by ...
Dielectric properties of the system Ca1 -x La x Ti1 -x Co x O3

Durga Prasad, C.; Tewari, H.S.; Kumar, D.; Parkash, O. (Springer India, 1988-12)

Dielectric behaviour of samples of the system Ca1 -x La x Ti1 -x Co x O3 with x ≤ 0·20 has been studied in the temperature range 300-525 K as a function of frequency. The strong dispersion of e{open} and D observed in these ...
Equivalent circuit models for electronic ceramics

Pandey, L.; Parkash, O.M.; Katare, R.K.; Kumar, D. (Springer India, 1995-09)

Complex immittance spectra of model equivalent circuits involving resistive and capacitive elements are calculated. A comparison of experimentally obtained complex immittance plots with these diagrams greatly facilitates ...
Effect of composition on dielectric and electrical properties of the Sr1-xLaxTi1-xCoxO3 system

Upadhyay, S.; Kumar, D.; Parkash, O. (Indian Academy of Sciences, 1996)

Valence compensated perovskite system Sr1-xLaxTi1-xCoxO3 shows dielectric relaxor behaviour with very high value of dielectric constant in the composition range 0.20 < x < 0.40. In this paper the effect of composition on ...
Evidence for another low-temperature phase transition in tetragonal (formula presented) (formula presented)

Ragini, R.; Mishra, S.K.; Pandey, D.; Lemmens, H.; Tendeloo, G.V. (2001)

Results of dielectric and resonance frequency (formula presented) measurements below room temperature are presented for (formula presented) (formula presented) and 0.520. It is shown that the temperature coefficient of ...
Comparison of the Cc and R3c space groups for the superlattice phase of Pb(Zr 0.52Ti 0.48)O 3

Ranjan, R.; Singh, A.K.; Ragini; Pandey, D. (2005-03-01)

Recent controversy about the space group of the low temperature superlattice phase of Pb(Zr 0.52Ti 0.48)O 3 is settled. It is shown that the R3c space group for the superlattice phase cannot correctly account for the peak ...
Thermally induced structural transformations on polymorphous silicon

Rath, C.; Farjas, J.; Roura, P.; Kail, F.; Roca i Cabarrocas, P.; Bertran, E. (2005-09)

Polymorphous Si is a nanostructured form of hydrogenated amorphous Si that contains a small fraction of Si nanocrystals or clusters. Its thermally induced transformations such as relaxation, dehydrogenation, and crystallization ...
Si3N4 single-crystal nanowires grown from silicon micro- and nanoparticles near the threshold of passive oxidation

Farjas, J.; Rath, C.; Pinyol, A.; Roura, P.; Bertran, E. (2005-11-07)

A simple and most promising oxide-assisted catalyst-free method is used to prepare silicon nitride nanowires that give rise to high yield in a short time. After a brief analysis of the state of the art, we reveal the crucial ...
Calorimetry of dehydrogenation and dangling-bond recombination in several hydrogenated amorphous silicon materials

Roura, P.; Farjas, J.; Rath, C.; Serra-Miralles, J.; Bertran, E.; Roca I Cabarrocas, P. (2006)

Differential scanning calorimetry (DSC) was used to study the dehydrogenation processes that take place in three hydrogenated amorphous silicon materials: nanoparticles, polymorphous silicon, and conventional device-quality ...
Evolution of short-range to long-range monoclinic order of MB type with decreasing temperature in 0.75[Pb(Mg1/3Nb 2/3)O3]-0.25PbTiO3

Singh, A.K.; Pandey, D.; Zaharko, O. (2006-04)

Results of Rietveld analysis of powder neutron diffraction data on 0.75 [Pb (Mg13 Nb23) O3] -0.25PbTi O3 (PMN-0.25PT) at room temperature and 80 K are presented. It is shown that the currently believed structural model ...
Kinetic study of the oxide-assisted catalyst-free synthesis of silicon nitride nanowires

Farjas, J.; Pinyol, A.; Rath, C.; Roura, P.; Bertran, E. (2006-05)

The synthesis of Si 3N 4 nanowires from the reaction of silicon nanoparticles with N 2 in the 1200-1440°C temperature range is reported. The nitridation conditions are such that the reaction with nitrogen is favoured by ...
Anomalous lattice expansion of RuSr2Eu1.5Ce0.5Cu2 O10-δ (Ru-1222) magneto superconductor: A low temperature X-ray diffraction study

Awana, V.P.S.; Ranjan, R.; Rawat, R.; Chandra, L.S.S.; Peurla, M.; Ganesan, V.; Kishan, H.; Pandey, D.; Laiho, R.; Takayama-Muromachi, E.; Narlikar, A.V. (2006-10)

Detailed X-ray diffraction studies on RuSr2Eu1.5Ce0.5Cu2 O10-δ (Eu-Ru-1222) magneto superconductor down to 13 K at close temperature intervals revealed that with decreasing temperature, the c-parameter decreases linearly ...
High-resolution synchrotron x-ray diffraction study of Zr-rich compositions of Pb ZrxTi1-x)O3(0.525≤x≤0.60): Evidence for the absence of the rhombohedral phase

Singh, A.K.; Pandey, D.; Yoon, S.; Baik, S.; Shin, N. (2007)

Results of Rietveld analysis of the synchrotron x-ray diffraction data on Pb (Zrx Ti1-x) O3 (PZT) for 0.525≤x≤0.60 are presented to show the absence of rhombohedral phase on the Zr-rich side of the morphotropic phase ...
Evidence for monoclinic crystal structure and negative thermal expansion below magnetic transition temperature in Pb (Fe12 Nb12) O3

Singh, S.P.; Pandey, D.; Yoon, S.; Baik, S.; Shin, N. (2007)

The existing controversy about the room temperature structure of multiferroic Pb (Fe12 Nb12) O3 is settled using synchrotron powder x-ray diffraction data. Results of Rietveld refinements in the temperature range of 300-12 ...
Stability of ferroic phases in the highly piezoelectric Pb(ZrxTi1 x)O3 ceramics

Dhananjai Pandey; Akhilesh Kumar Singh; Sunggi Baik (International Union of Crystallography, 2007-11-02)

The morphotropic phase boundary in the phase diagram of the technologically important Pb(ZrxTi1-x)O3 (PZT) ceramics has been traditionally believed to separate ferroelectric tetragonal and rhombohedral phase regions. This ...
High-temperature relaxor ferroelectric behavior in Pr-doped SrTi O3

Ranjan, R.; Hackl, R.; Chandra, A.; Schmidbauer, E.; Trots, D.; Boysen, H. (2007-12-20)

Temperature-dependent Raman scattering, dielectric, and powder x-ray diffraction studies have been carried out on Pr-doped SrTi O3 ceramic samples. Activation of T O2 and T O4 polar modes indicated increasing degree of ...
Origin of high piezoelectric response of Pb(ZrxTi 1-x)O3 at the morphotropic phase boundary: Role of elastic instability

Singh, A.K.; Mishra, S.K.; Ragini; Pandey, D.; Yoon, S.; Baik, S.; Shin, N. (American Institute of Physics, 2008)

Temperature dependent structural changes in a nearly pure monoclinic phase composition (x=0.525) of Pb (Zrx Ti1-x) O3 (PZT) have been investigated using Rietveld analysis of high-resolution synchrotron powder x-ray diffraction ...
Resolving the characteristics of morphotropic phase boundary in the (1-x) Pb (Fe1/2 Nb1/2) O3 -x PbTiO3 system: A combined dielectric and synchrotron x-ray diffraction study

Singh, S.P.; Pandey, D.; Yoon, S.; Baik, S.; Shin, N. (2008)

Frequency dependent dielectric studies on the mixed system (1-x) Pb (Fe1/2 Nb1/2) O3 -x PbTiO3 reveal contributions from the electrodes, grain boundaries, and grains. It is shown that the intrinsic value of the dielectric ...

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