Soma Roy’s research while affiliated with Saha Institute of Nuclear Physics and other places

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Publications (2)

Fig. 1. FT-IR spectrum representing the characteristic frequencies of ZnO material synthesized from aqueous route and dried in vacuum oven at 100 °C for 12 h and then dried to 200 °C. 
Fig. 2. EDAX data: a purity check of the ZnO sample as synthesized through sol-gel chemical route, inset shows the ZnO nano particles with fringed structure of the crystalline sample from TEM picture. 
Table 3 The unit cell parameters after sintering at 1000 °C as per Rietveld refinement analysis. 
Fig. 3. (a) X-ray diffraction pattern (raw data as obtained) ZnO-nano crystalline grains at different sintering temperatures. (b) Rietveld fit with GSAS. Graph is scaled twice. 
Fig. 4. Decay scheme of 111m Cd 48 , IT, T 1/2 = 48.54 m, isomeric level with 5/2 + spin where EFG tensor interacts with nuclear quadrupole moment Q, an illustration of the typical PAC measurement. 
Investigation on structural aspects of ZnO nano-crystal using radio-active ion beam and PAC
  • Article
  • Full-text available

November 2015

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228 Reads

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2 Citations

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms

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Sreetama Dutta

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Soma Roy

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Manfred Martin

Nano-crystalline ZnO has been studied with perturbed angular correlation using 111mCd, implanted at ISOLDE/CERN and X-ray diffraction using Rietveld analysis. The data show a gradual increase in the crystal size and stress for a sample annealed at 600 °C, and reaching nearly properties of standard ZnO with tempering at 1000 °C. The perturbed angular correlation data show a broad frequency distribution at low annealing temperatures and small particle sizes, whereas at high annealing temperature and larger crystal sizes, results similar to bulk ZnO have been obtained. The ZnO nano-crystalline samples were initially prepared through a wet chemical route, have been examined by Fourier Transform Infrared Spectroscopy (FT-IR) and chemical purity has been confirmed with Energy Dispersive X-ray (EDAX) analysis as well as Transmission Electron Microscopy (TEM).

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Fig. 1. FT-IR spectrum representing the characteristic frequencies of ZnO material synthesized from aqueous route and dried in vacuum oven at 100 °C for 12 h and then dried to 200 °C. 
Fig. 2. EDAX data: a purity check of the ZnO sample as synthesized through sol-gel chemical route, inset shows the ZnO nano particles with fringed structure of the crystalline sample from TEM picture. 
Fig. 3. (a) X-ray diffraction pattern (raw data as obtained) ZnO-nano crystalline grains at different sintering temperatures. (b) Rietveld fit with GSAS. Graph is scaled twice. 
Table 3 The unit cell parameters after sintering at 1000 °C as per Rietveld refinement analysis. 
Fig. 4. Decay scheme of 111m Cd 48 , IT, T 1/2 = 48.54 m, isomeric level with 5/2 + spin where EFG tensor interacts with nuclear quadrupole moment Q, an illustration of the typical PAC measurement. 
Gauging Structural Aspects of ZnO nano-Crystal Growth ThroughX-ray Diffraction Studies and PAC

November 2013

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137 Reads

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Sreetama Dutta

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Soma Roy

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ISOLDE-Collaboration

The structural characterization of sol-gel based nano crystalline ZnO material is being reported as we observe several previously unreported structural aspects following a sequence of annealing stages. As-grown samples were characterised by Fourier Transform Infrared Spectroscopy (FTIR). Chemical purity of the nano-grains and their crystallinity has been monitored by energy dispersive X-ray (EDAX) analysis and transmission electron microscopy (TEM), while the unusual changes in nano-crystal growth structure have been studied by X-ray diffraction method. In addition, such samples have been studied by using perturbed angular correlation (PAC) technique with the short-lived radioactive probe 111mCd. Changes in the local electronic environment following sintering of the nano-crystalline grains have been observed by this method.

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