K.V. Singh

Room temperature long range ferromagnetic ordering in (BiFeO3)1−x (PbTiO3)x nanocrystallites

Room temperature Mossbauer spectra of (BiFeO3)1−x (PbTiO3)x (x = 0, 0.1, 0.2, 0.3) nano multiferroic systems prepared by solution combustion technique reveal the long range ferromagnetic ordering, supported by M-H loop measurements. Magnetic hyperfine interaction field and isomer shift for these nanocrystallite indicate the presence of Fe3 +  ion only, likewise confirmed by from X-ray photoelectron spectroscopy study, which is essential for enhancement of multiferroic properties. A small residual magnetic moment is observed for these nanoparticles, which may be attributed to size confinement at nanoscale and to spin canting. These nanomaterials are of great importance in basic as well as applied research.

Response of Different Doses of NPK and Boron on Growth and Yield of Broccoli (Brassicaoleracea L. var. italica)

The present investigation was carried out to examine the optimum doses of NPK and boron application on broccoli in irrigated agro-ecosystem of western Uttar Pradesh during rabi 2009–10 and 2010–11. Seven different treatments including control were used in Randomized Block design (RBD). The results revealed significant response on growth and yield of broccoli for different treatments. Application of 120 kg N+60 kg P2O5+40 kg K2O+15 kg B ha−1 gave maximum plant height plant−1 (65.33 cm), number of leaves plant−1 (18.26), length longest leaf (52.99 cm), width of longest leaf (17.98 cm), spread of plant (55.53 cm) and stem diameter (4.47 cm), whereas in control was minimum pronounced plant height plant−1 (58.66 cm), number of leaves plant−1 (12.33), length longest leaf (42.70 cm) width of longest leaf (14.18 cm), spread of plant and stem diameter (3.04 cm). Similar, pattern on the curd diameter (13.69 cm), length of curd (16.33 cm), weight of curd plant−1 (286.89 g), weight of sprout plant−1 (126.89 g), weight of curd and sprout plant−1 (0.390 kg) and total yield Curd+sprout (148.51 q ha−1) was recorded with the application of 120 kg N+60 kg P2O5+40 kg K2O+15 kg B ha−1’ and minimum was under control treatment.

Dispersion Studies of La Substitution on Dielectric Properties of Multiferroic BiFeO{sub 3} Ceramics

Lanthanum (La)–substituted multiferroic Bi1−xLaxFeO3 ceramics with x = 0.0, 0.05, 0.10, 0.15, 0.20 and 0.25 have been prepared by solution combustion method. The effect of La substitution for the dispersion studies on dielectric properties of Bi1−xLaxFeO3 samples have been studied by performing x–ray diffraction (XRD) and dielectric measurements. The results of prepared samples are compared with those of bismuth ferrite (BiFeO3). In the measuring frequency of 10 KHz–1 MHz, the dielectric constants and dielectric losses for samples x = 0.20, 0.25 are almost stable and exhibited lowest dielectric loss close to 0.1. The results also shows that stabilization of crystal structure and nonuniformity in spincycloid structure by La substitution enhances the dielectric properties.

Magnetic Studies of Mutiferroic Bi1−xLaxFeO3Ceramics Synthesized By Solution Combustion Technique

Bi 1− x La x FeO 3 ( x = 0.0, 0.05, 0.10, 0.15) ceramic samples were prepared by solution combustion technique. X‐ray diffraction patterns confirmed the formation of perovskite structured Bi 1− x La x FeO 3 phase. Saturation magnetization ( M s ) increases with increasing La concentration from x = 0.0 to x = 0.15. Weak ferromagnetism is observed at room temperature in all the doped and undoped BFO samples. Mossbauer spectroscopy confirmed the presence of single‐phase material for the doped compositions. Improvement in magnetic behavior appears to arise from a combination of the propensity of the samples to form pure phase material, partial destruction of spin cycloids and increased canting of spins.

Magnetic Studies of Mutiferroic Bi{sub 1-x}La{sub x}FeO{sub 3} Ceramics Synthesized By Solution Combustion Technique

Bi 1− x La x FeO 3 ( x = 0.0, 0.05, 0.10, 0.15) ceramic samples were prepared by solution combustion technique. X‐ray diffraction patterns confirmed the formation of perovskite structured Bi 1− x La x FeO 3 phase. Saturation magnetization ( M s ) increases with increasing La concentration from x = 0.0 to x = 0.15. Weak ferromagnetism is observed at room temperature in all the doped and undoped BFO samples. Mossbauer spectroscopy confirmed the presence of single‐phase material for the doped compositions. Improvement in magnetic behavior appears to arise from a combination of the propensity of the samples to form pure phase material, partial destruction of spin cycloids and increased canting of spins.

Magnetic Studies of Mutiferroic Bi1−xLaxFeO3 Ceramics Synthesized By Solution Combustion Technique

Bi 1− x La x FeO 3 ( x = 0.0, 0.05, 0.10, 0.15) ceramic samples were prepared by solution combustion technique. X‐ray diffraction patterns confirmed the formation of perovskite structured Bi 1− x La x FeO 3 phase. Saturation magnetization ( M s ) increases with increasing La concentration from x = 0.0 to x = 0.15. Weak ferromagnetism is observed at room temperature in all the doped and undoped BFO samples. Mossbauer spectroscopy confirmed the presence of single‐phase material for the doped compositions. Improvement in magnetic behavior appears to arise from a combination of the propensity of the samples to form pure phase material, partial destruction of spin cycloids and increased canting of spins.