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, however, too high to use ...

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ball mill for a long time 11,27 (up to 11 days 29) or wet-milled with zirconia balls in propan-2-ol for 6 h 2 or 24 h 16, respectively. These mixtures were then calcined at 850 °C 11,29, 900 °C 19, 27, 28, 1000 °C 30 or 1100 °C 2, 16 for4h16,12h28, 30,orupto24h19, 27. In some cases, the calcination was repeated at the same temperature 16 or at

Figure 2 shows an example of the PXRD data refinement of Az 2 PbX 4 (X = Cl, Br) samples obtained from the ball mill mechanosynthesis. The refined lattice parameters of Az 2 PbBr 4 are a = 5.993(6) Å and c = 21.501(1) Å, with goodness-of-fit parameters χ 2 = 10.21 and wR p = 0.115, while those of Az 2 PbCl 4 are a = 5.765(0) Å and c = 21 ...

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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. ... high-energy ball mill ...

Alkynyl functionalized g-C 3 N 4 were prepared via a facile ball-milling process. The synthesis route is intuitively depicted in scheme 1.Typically, a mixture of g-C 3 N 4 and CaC 2 with designed mass ratio was added to a 100 mL stainless steel pot along with 50 mL absolute ethanol and 300 g stainless balls. The ball milling lasted at 600 rpm for 24 h with 15 min rest for natural cooling after ...

Planetary Mill Giá - aquablue.co.in. camno3 bi ball mill . ball mills plaary - hotelgalaxy. Ball mill - Wikipedia, the free encyclopedia The ball mill is used for grinding, Aside from common ball mills there is a second type of ball mill called a planetary ball mill Planetary ball mills are .

After ball milling, the diffraction peak width increases due to the grain refinement of the mixed powder, as shown in Fig. 7(2/4). Ball milling makes the lattice distortion of CuSn10 alloy produce dislocation and other defects. On the one hand, Bi or FeS solid solution in the CuSn10 alloy causes the diffraction peak of the CuSn10 alloy to decrease.

A rapid (1.5 h) one-step ball milling (BM) method was developed not only to modify commercial MnO2 via top-down approaches (BM0), but also to bottom-up synthesize MnOx by cogrinding of KMnO4 and MnC4H6O4 (BM1) or KMnO4 and MnSO4 (BM2). Catalysts activity on gaseous POPs removal was tested using hexachlorobenzene (HCBz) as surrogate. Catalytic performance decreases in the order …

Electron and phonon transports in CaMnO3 and its Bi-doped counterpart, Bi0.03Ca0.97MnO3, are investigated by thermoelectric transport measurements, Raman spectroscopy, and first-principles ...

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...

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 coefficient. In addition, it decreased ...

Tunable thermoelectric properties of Ca 0.9 Yb 0.1 MnO 3 through controlling the particle size via ball mill processing R Kabir, D Wang, T Zhang, R Tian, R Donelson, TT Tan, S Li Ceramics International 40 (10), 16701-16706, 2014

Substitution of Re7+ into CaMnO3: an efficient free electron generation dopant for tuning of thermoelectric properties. Phys Chem Chem Phys. 2017;19:30781-9. 20 Paengson S, Pilasuta P, Singsoog K, Namhongsa W, Impho W, Seetawan T. Improvement in thermoelectric properties of CaMnO3 by Bi doping and hot pressing.

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The BI of WTPS45 increased by 19.8% compared with REF and at 730 days it was more efficient than REF with a reduction of 1.33 kg/m³.MPa of binder (7.5%). The compressive strength of WTPS45 increased by 59.4% from 28 to 730 days, in contrast to 23.0% for REF in the same period.

camno3 bi ball mill Introduction. The Selection and Design of Mill Liners - MillTraj. Figure 5. High–low wave ball mill liner Materials The selection of the material of construction is a function of the application, abrasivity of ore, size of mill, corrosion environment, size of …

shown by the ball­milling and hot pressing approach using Bi–Te–Se ingots [17]. In silicon, this transition from micro­ crystalline to nanocrystalline bulk has been shown to reduce the lattice thermal conductivity up to 90% with respect to a single crystal by increased phonon scattering at grain bounda­ ries [18].

Ball mills have large applicability in the mining industry. At the same time, ball mills are considered as low efficient equipment. Laboratory tests using tumbling mills for batch grinding have ...

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A series of Ca 0.9 La 0.1−x Bi x MnO 3−δ (0 ≤ x ≤ 0.1) was fabricated by cold compaction and tape casting methods. The microstructural and thermoelectric properties of Ca 0.9 La 0.1−x Bi x MnO 3−δ were studied, with respect to the partial substitution of Bi 3+ for La 3+.All of the sintered Ca 0.9 La 0.1−x Bi x MnO 3−δ crystallized in the orthorhombic perovskite structure ...

CN105355771A - - Google Patents

Bi 2Te 3. The poor performance is due to the high thermal con-ductivity, and hence it is desirable to reduce the thermal con-ductivity, thereby increasing the thermoelectric dimensionless figure of merit ZT. One of the possible ways to lower the lattice thermal conductivity is enhancing the grain boundary scattering through refining the grain ...

Zhu Y, Wang C, Wang H, Su W, Liu J, Li J (2014) Influence of Dy/Bi dual doping on thermoelectric performance of CaMnO3 ceramics. Mater Chem Phys 144:385–389. CAS Article Google Scholar 27. Park JW, Kwak DH, Yoon SH, Choi SC (2009) Thermoelectric properties of Bi, Nb co-substituted CaMnO3 at high temperature.

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Bi doping can effectively decouple the electrical and thermal conductivity of CaMnO3. The highest power factor of 4.67 × 10 −4 W m −1 K −2 was achieved for Ca 0.97 Bi 0.03 MnO 3. The sample Ca 0.97 Bi 0.03 MnO 3 reached the lowest thermal conductivity of ∼1.4 W m −1 K −1. The sample Ca 0.97 Bi 0.03 MnO 3 exhibited the highest ZT of ...

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 ...

Four titanium alloys (Ti-Ta, Ti-Ta-Sn, Ti-Ta-Mn, and Ti-Nb-Sn) were synthesized by mechanical alloying (MA) in a planetary mill in different times between 2 h and 100 h. The microstructure characterization was made by X-ray diffraction (XRD), in which the Rietveld method was applied to analyze the diffraction patterns. The study demonstrated that after short milling times between 2 h and …

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 the M–O bond, which

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 ytterbium ...

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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 , Haan, Germany) and grinding balls with 3-mm diameter.