http://nopr.niscpr.res.in/handle/123456789/24323 2026-10-09T20:49:29Z http://nopr.niscpr.res.in/handle/123456789/24444 Title: Low temperature synthesis of MoO₃ through the use of NH₂OH.HC1<b> </b>as reducing agent Authors: Mallikarjuna, N N; Venkataraman, A Abstract: This paper reports a novel technique for the synthesis of MoO₃ through the reduction of ammonium molybdate using hydroxylamine hydrochloride as a reductant. MoO₃ is formed upon thermal decomposition of the reduced ammonium molybdate. The progress of the formation of the oxide is understood on the basis of structure and thermal studies. Page(s): 303-306 2001-10-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/24441 Title: Synthesis and characterization of IPP-g-glycidylmethacrylate copolymer Authors: Brahmbhatt, Ragesh B; Patel, Alpesh C; Devi, Surekha Abstract: Isotactic polypropylene (IPP) was grafted with glycidylmethacrylate (GMA) using benzoylperoxide as free radical initiator in an inert atmosphere and toluene as solvent at 110°C temperature. Various reaction conditions such as monomer and initiator concentration, time, temperature, medium and atmosphere were optimized for achieving higher % of grafting. Maximum 2.8% grafting was observed. The graft copolymers were characterized by thermal and spectral methods. Page(s): 297-302 2001-10-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/24440 Title: Hydration of C₄AF in the presence of artificial CaSO₄ and lime Authors: El-Alfi, S; Abd-Aleem, S; El-Didamony, H Abstract: The ferrite phase consists of about 8-13 wt% portland cement. This phase has received little attention with regard to its hydration. The aim of present investigation is to synthesize the ferrite phase and study the rate of hydration in the presence of CaSO₄ and CaO up to 28-days in suspension. This study is followed by the determination of the free lime as well as combined water con tents and the hydration products by the XRD analysis. The results revealed that whatever the amount of CaSO₄ the monosulphate AF_m was the only phase formed from 6 h up to 28-days and the ettringite AF_t was not formed. In the presence of 1 mol CaSO₄ and 2 mol CaO, the monosulphate AF_m with carboaluminate was the dominant phase at 28-days. When the amount of CaSO₄ was increased to 3 mol with the same amount of lime the hydration was retarded in comparison with that containing 1 mol of CaSO₄. Very small amount of sulphoaluminate ferrite hydrate was formed with residual reactants such as C₄AF,CaSO₄ and Ca(OH)₂. Page(s): 292-296 2001-10-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/24439 Title: Structural and dielectric properties of KTiOPO₄ ceramic Authors: Choudhary, S N; Prasad, K; Choudhary, R N P Abstract: Ceramic samples of KTiOPO₄are prepared using chemical method. X-ray diffraction (XRD) technique has been used to check the formation of single phase KTiOPO₄ compound. The cell parameters obtained by XRD analyses are <i>a = </i>20.125(8) Å, <i>b = </i>8.433(1) Å and <i>c = </i>11.492(4) Å in orthorhombic crystal system. The ceramic samples of KTiOPO₄ have<i> </i>been characterized by dielectric studies. The room temperature values of dielectric constant and dielectric loss are found to be 10.32 and 0.12 respectively at 1 kHz. Page(s): 289-291 2001-10-01T00:00:00Z