Growth and Structural Characterization of Gadolinium Neodymium Oxalate Crystals Grown in Hydro-Silica Gel

Korah, Ignatius; Joseph, Cyriac; Ittyachen, M. A.

doi:10.4236/jmmce.2010.912078

Cited by 5 publications

(5 citation statements)

References 18 publications

(18 reference statements)

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“…Optical studies using UV‐vis spectroscopy showed extent of transparency of the crystals to the UV‐vis light, which helps in finding the energy gap of the sample …”

Section: Resultsmentioning

confidence: 99%

Growth, Characterization and Conductivity of Chromium Mixed Cadmium Oxalate Crystals

Ponnappa¹,

Nettar²,

Mylnahalli³

et al. 2018

Crystal Research and Technology

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Chromium mixed cadmium oxalate (CMCO) [Cr:Cd (C2O4).3H2O] crystals are grown by gel diffusion method using silica hydro gel as growth media at ambient temperature. The optimum condition for growth is established by varying the parameters such as specific gravity, pH, gel aging, concentration of reactants and ratio of mixture Cd+2 to Cr+3. Energy dispersive X‐ray spectroscopy (EDX) confirms the existence of Cd+2 and Cr+3 ions in the crystal lattice of CMCO. Thermo‐gravimetric analysis (TGA) reveal that, the CMCO are thermally stable up to 950 °C, which confirms the presence of three water molecules in the crystal lattice of CMCO. FT‐IR spectrum exhibits the presence of OH, carboxyl group and metal‐oxygen bonding. In this study, the occupation of vacancies of Cd+2 ions by Cr+3 cations in the lattice of mixed cadmium oxalate crystals without altering the morphology of the parent crystal is confirmed.

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“…Optical studies using UV‐vis spectroscopy showed extent of transparency of the crystals to the UV‐vis light, which helps in finding the energy gap of the sample …”

Section: Resultsmentioning

confidence: 99%

Growth, Characterization and Conductivity of Chromium Mixed Cadmium Oxalate Crystals

Ponnappa¹,

Nettar²,

Mylnahalli³

et al. 2018

Crystal Research and Technology

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“…The TGA curve has the usual shape already reported for lanthanide oxalates. 22,26 The total weight loss of 44.5 wt.% is significantly lower than the value of ∼53% observed in similar compound. 22,23 This indicates a low interstitial or "zeolitic" water content phase.…”

mentioning

confidence: 79%

“…Lanthanide oxalates were studied for a long time for their optical properties and are generally prepared in the form of single crystals. [20][21][22][23][24][25] They are also used as precursors for the synthesis of ceramics. 26,27 The phases usually described have the composition Ln 2 (C 2 O 4 ) 3 ·nH 2 O, a rich water phase presenting a weight loss of about 53% between 25 and 650…”

mentioning

confidence: 99%

Magnetocaloric effect in gadolinium-oxalate framework Gd2(C2O4)3(H2O)6⋅(0⋅6H2O)

et al. 2014

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Magnetic refrigerants incorporating Gd3+ ions and light organic ligands offer a good balance between isolation of the magnetic centers and their density. We synthesized the framework material Gd2(C2O4)3(H2O)6⋅0.6H2O by a hydrothermal route and characterized its structure. The honeycomb lattice of Gd3+ ions interlinked by oxalate ligands in the (a,c) plane ensures their decoupling in terms of magnetic exchange interactions. This is corroborated by magnetic measurements indicating negligible interactions between the Gd3+ ions in this material. The magnetocaloric effect was evaluated from isothermal magnetization measurements. The maximum entropy change −ΔSMmax reaches 75.9 mJ cm−3 K−1 (around 2 K) for a moderate field change (2 T).

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“…Keskar et al [24] have carried out detailed study on thermal expansion of some other molybdates and tungstates such as Gd 2 Mo 3 O 12 and Gd 2 W 3 O 12 . Korah et al [25] reported the growth and structural characteristics of gadolinium neodymium oxalate crystals.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Thermal Kinetics of Mixed Gadolinium: Calcium Heptamolybdate System

Koul

Suri

Singh

et al. 2014

International Scholarly Research Notices

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Synthesis of mixed gadolinium calcium heptamolybdate (GdCaHM) system in silica gel medium using single gel single tube technique has been successfully achieved. The grown crystal exhibits various morphologies, which includes spherulites, multifaceted, and square platelets. The nature of the grown material was established by X-ray diffraction (XRD) studies. Fourier transform infrared spectroscopy (FTIR) study signifies the presence of heptamolybdate (Mo7O24) and water symmetry structure, whereas energy dispersive X-ray analysis (EDAX) establishes the stoichiometric of the grown crystal as GdCaMo7O24·8H2O. The thermal behaviour was studied using the thermoanalytical techniques, which include thermogravimetry (TG), differential thermal analysis (DTA), and differential scanning calorimetry (DSC). Results obtained on the application of TG based models, namely, Horowitz-Metzger, Coats-Redfern, and Piloyan-Novikova, suggest the contracting cylindrical model as the relevant model for the thermal decomposition of the material. The kinetic parameters, namely, the order of reaction (n), activation energy (E a), frequency factor (Z), and entropy (ΔS∗), were also calculated using these three models.

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Growth and Structural Characterization of Gadolinium Neodymium Oxalate Crystals Grown in Hydro-Silica Gel

Cited by 5 publications

References 18 publications

Growth, Characterization and Conductivity of Chromium Mixed Cadmium Oxalate Crystals

Growth, Characterization and Conductivity of Chromium Mixed Cadmium Oxalate Crystals

Magnetocaloric effect in gadolinium-oxalate framework Gd2(C2O4)3(H2O)6⋅(0⋅6H2O)

Synthesis, Characterization, and Thermal Kinetics of Mixed Gadolinium: Calcium Heptamolybdate System

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