Tunable thermoelectric properties of Ca0.9Yb0.1MnO3 through controlling the particle size via ball mill processing ... phonon scattering of CaMnO3 was investigated. ...

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Stoichiometric amounts of CaCO 3, MnO 2 were mixed with deionized water and milled for 6 h at 350 rpm in a planetary ball mill. The ball, deionized water to powder weight ratio was 5:6:1. The slurry dried in an oven and then heated at 1100 ̊C in a muffle furnace for 12 h. The fine powder was obtained after grinding and sieving.

II. EXPERIMENTAL. In the first part of the study, powders of CaMn 0.98 Nb 0.02 O 3 were synthesized batch-wise in a noncontinuous way by a chimie douce method. After the calcination at 1100 °C for 8 h, the powder was additionally ball milled for 1 h with a planetary mill (Retsch PM 400, Retsch GmbH, Haan, Germany) and grinding balls with 3-mm diameter.

The ball mill is a key piece of equipment for grinding crushed materials, and it is widely used in production lines for powders such as cement, silicates, refractory material, fertilizer, glass ceramics, etc. as well as for ore dressing of both ferrous and non-ferrous metals. The ball mill can grind various ores and other materials either wet ...

Request PDF | Tunable thermoelectric properties of Ca0.9Yb0.1MnO3 through controlling the particle size via ball mill processing | This paper reports the thermoelectric properties of …

Research and development of thermoelectric generators have been actively carried out to use waste heat. It is well known some p-type oxides show high thermoelectric performance. However, an n-type oxide with high performance has not been found. An n-type CaMnO3 is a promising material because of its high Seebeck coefficient. The electrical resistivity of this oxide is, …

Perovskite‐type Ca1−xYbxMn0.98Nb0.02O3 (x = 0, 0.02, 0.05, 0.08, and 0.1) thermoelectric materials were synthesized by a solid‐state reaction technique. The dopant‐level dependence of lattice parame...

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1/2Bi 1/2TiO 3-xBaTiO 3-yK 0.5Na 0.5NbO 3 (NBT-xBT- yKNN), where x and y denote mole% was prepared using the solid state route. Stoichiometric amounts of Na 2CO 3 (99.5%), K 2CO 3 (99%), Bi 2O 3 (99.975%), TiO 2 (99.6%), and Nb 2O 5 (99.9%) (all Alfa Aesar) were milled in ethanol for 12 h using zirconia balls in a planetary ball mill. The dried ...

Afterwards, the powder was fine milled in a planetary ball mill (Pulverisette 5, Fritsch) with 2-Propanol and zirconia media in a POM grinding jar at 400 min −1 to the final mean particle size of d 50 = 0.8 µm (measured by laser diffraction, Mastersizer 2000, Malvern Instruments). 2.2. Soft chemistry routes2.2.1. Co-precipitation

In particular, we focus on CaMnO 3 and Bi 0.03 Ca0.97MnO 's electronic structures, temperature-dependent electron and phonon lifetimes, …

Synthesis of nanoparticles- physical,chemical and biological 1. SYNTHESIS OF NANOPARTICLES 2. Materials having unique properties arising from their nanoscale dimensions Nanomaterials with fast ion transport are related also to nanoionics and nanoelectronics Nanoscale materials can also be used for bulk applications Nanomaterials are sometimes …

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also prepared bi-14 and ter-15 metallic alkoxides. The suitability of the various alkoxides for sol–gel chemistry and outcome of the reactions depends on several things. One factor is how electronegativity differences between the oxygen and metal affect the ionic character of …

Oxide materials based on calcium manganite show clear prospects as thermoelectrics, provided by their stability at high temperatures and inherent flexibility in tuning the relevant electrical and thermal transport properties. Donor-doped CaMnO3 is an n-type semiconductor with a perovskite structure and relatively high thermoelectric performance. In …

The raw materials, including CaCO 3 (from QReC, purity ≥99%), MnO 2 (Fisher Scientific; purity ≥99.99%), and Bi 2 O 3 (QReC, purity ≥99.5%), were mixed using a planetary ball mill (RETSCH PM 400) in ethanol for 12 h. The mixed powder was calcined at 1273 K for 24 h in the atmosphere and then hot-pressed at 1173 K for an hour under 60 MPa ...

Dual-doped Ca 1−2x Dy x Bi x MnO 3 with x = 0.02, 0.05, 0.08 and 0.10 were successfully synthesized using conventional solid state reaction techniques. The influence of Dy and Bi dual-doping on the thermoelectric performance is found to be very effective in decreasing the electrical resistivity, and keeping a moderate absolute Seebeck ...

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In the first part of the study, powders of CaMn 0.98 Nb 0.02 O 3 were synthesized batch-wise in a noncontinuous way by a chimie douce method. After the calcination at 1100 °C for 8 h, the powder was additionally ball milled for 1 h with a planetary mill (Retsch PM 400, Retsch GmbH, Haan, Germany) and grinding balls with 3-mm diameter.

Perovskite manganites CaMn1−y W y O3 (0 ≤ y ≤ 0.05) were synthesized using solid-state reaction technique. The influence of W doping on the structure, charge carrier transports and phonon scattering of CaMnO3 was investigated. Doping was found to increase the carrier concentration, leading to enhanced electrical conductivity and decreased Seebeck …

We report the results of magnetic, X-ray powder diffraction, infrared and temperature dependent Raman spectra of the La0.8SrxCa0.2-xMnO3 (0 ≤ x ≤ 0.2) manganite. The structure refinement using the Rietveld method indicates that the partial substitution of strontium for calcium (for x ≥ 0.15) modifies the orthorhombic structure of the CaMnO3 perovskite towards a rhombohedral …

Synthesis of nanomaterials by a simple, low cost and in high yield has been a great challenge since the very early development of nanoscience. Various bottom and top down approaches have been developed so far, for the commercial production of nanomaterials. Among all top down approaches, high energy ball milling, has been widely exploited for the synthesis …

Improved process control and increased ball mill operating power draws have reduced the grind size back to around 150 to 160 µm at the elevated throughput rates. The regrind plant consists of two Verti-mills (one duty and one standby) with product reporting, via cyclone clusters, to the cleaner flotation plant.

Here we use first-principles calculations to investigate the stability of the Pnma perovskite CaMnO3 under bi-axial strain towards the formation of oxygen vacancies. ...

The size of the blind trommel and magnetic circuit can be varied to retrofit an existing ball mill and available space at the discharge. The magnetic circuit is designed to provide maximum strength for high slurry throughputs and up to 4 inch diameter grinding balls. The trunnion magnet can be configuration for reversing or bi-directional mills.

Thermoelectric (TE) materials could provide an efficient means for recovering waste heat energy if a low cost, scalable, and high figure-of-merit material could be fabricated. Here, we report, for the first time, a wet ball-milling method to achieve high-performance two-dimensional (2D) semi-metallic TiS2 nanoplatelets. TiO2 is milled, annealed, and sintered with …