A two-step synthesis approach was utilized to grow CaMnO3 on M-, R- and C-plane sapphire substrates. Radio-frequency reactive magnetron sputtering was used to grow rock-salt-structured (Ca, Mn)O followed by a 3-h annealing step at 800 °C in oxygen flow to form the distorted perovskite phase CaMnO3. The effect of temperature in the …
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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 calculations. In particular, we focus on CaMnO3 and Bi0.03Ca0.97MnO3's electronic structures, temperature-dependent electron and phonon …
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CaMnO3. Lithium ion batteries. Anode. Different temperature. 1. Introduction. Lithium ion batteries (LIBs) have received significant attention for energy …
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The material CaMnO3 is a fascinating example of the rich properties of perovskite materials and continues to attract the attention of researchers in materials science and condensed …
... Much effort has been made to study various doping strategies aimed at increasing the electrical conductivity and thermoelectric efficiency of CaMnO 3 . The …
DOI: 10.1016/J.JALLCOM.2009.08.012 Corpus ID: 95720565; Thermoelectric properties of Bi, Nb co-substituted CaMnO3 at high temperature @article{Park2009ThermoelectricPO, title={Thermoelectric properties of Bi, Nb co-substituted CaMnO3 at high temperature}, author={Jong-Woon Park and D. H. Kwak …
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Stephen Charles Parker. University of Bath. Feridoon Azough. Show all 5 authors. Abstract. First principle calculations were employed to investigate the …
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Donor-doped CaMnO3 is an n-type semiconductor with perovskite structure, being considered as a potential n-type leg in thermoelectric modules. This …
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CaMnO3 is Orthorhombic Perovskite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Ca2+ is bonded in a 8 …
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The lowest thermal conductivity (1.4 W m−1 K−1) was obtained at 973 K for the same composition (x = 0.03). The maximum ZT value obtained was ∼0.25 at 973 K for x = 0.03; a threefold increase over that of undoped CaMnO3. Publisher: Elsevier Keywords: Thermoelectric; CaMnO3; Bi doping; Thermal conductivity
The thermoelectric concrete bricks of the III-layer brick type of 27.70 mV displayed output voltage results being higher than those of the I-layer brick of 26.57 mV and the CaMnO3 TEG module ...
Perovskite manganites CaMn1−yWyO3 (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 …
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Abstract. First principle calculations were employed to investigate the orthorhombic perovskite CaMnO 3 and the impact of reduced oxygen content on the electronic, …
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Thus, one of the ways not widely explored by research would Perovskite oxides like CaMnO3 (CMO) and SrTiO3 ceramics be to produce ceramics with larger grains by increasing the are well-advised as most promising n-type thermoelectric sintering time, intending to increase the ZT values. ceramics, due to the flexibility respect to doping at …
The lattice parameters and cell volume were increased with increasing Bi contents and increased density of all samples. The SEM image shows good compactness and connecting grain. Then Ï of all doped samples were decreased with decreasing Bi contents and showed metallic behavior. The κ has been lowest at x = 0.03 of 3.6 W m-1 …
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Section snippets Results and discussion. The crystal structures of the as-synthesized materials were characterized via X-ray diffraction (XRD) as shown in Fig. 1b. The XRD pattern of CaMnO 3 can be indexed to the orthorhombic perovskite with the space group Pnma, which agrees well with the standard card of CaMnO 3 [37], [39]. No …
The electron and phonon transports in CaMnO3 and in one of its Bi-doped counterparts, namely, Bi0.03Ca0.97MnO3, are investigated using the thermoelectric transport measurements and first ...
Fig.␣1 shows the powder X-ray diffraction spectra of the Bi doped Ca 1− x Bi x MnO 3 for the composition studied (x = 0, 0.02, 0.03, 0.04, 0.06 and 0.10). In each case all diffraction peaks could be assigned to the CaMnO 3 phase with the Pnma space group (JCPD 01-073-6702) thus indicating that the powders were a single phase. The …
Electron-doped perovskite Ca 1−x Bi x MnO 3 ( x = 0, 0.02, 0.03, 0.04, 0.06 and 0.10) was prepared by a conventional solid-state reaction method. Their homogeneity was confirmed using X-ray diffraction and their thermoelectric properties were measured up to 973 K. The results indicate that both the electrical resistivity and the absolute ...
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Calcium manganate (CMO) is a promising n-type semiconductor for thermoelectric applications due to its intrinsic properties. Still, these properties are highly dependent on the processing route used to produce these materials. In this work, properties of the polycrystalline CMO ceramics are reported by studying samples obtained from powders …
A two-step synthesis approach was utilized to grow CaMnO3 on M-, R- and C-plane sapphire substrates. Radio-frequency reactive magnetron sputtering was used …
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The sol–gel prepared (1-x)Na0.5Bi0.5TiO3-(x) CaMnO3 (x = 0, 0.03, 0.06, 0.12) compositions show a Rhombohedral (R3c) phase up to x = 0.06 while a mixed rhombohedral (R3c) and orthorhombic (Pnma) phases for the x = 0.12. The lattice volume consistently decreased with an increase in the CaMnO3 content. The phase transition …
A novel synthesis route for preparing well-defined composites based on CMO (CaMnO 3) has been established taking advantage of the unique phase relations in the system Ca-Mn-O at reducing- and oxidizing atmosphere, respectively.Samples corresponding to stoichiometric CMO and composites with 5 and 10 vol % of …
The electron and phonon transports in CaMnO 3 and in one of its Bi-doped counterparts, namely, Bi 0.03 Ca 0.97 MnO 3, are investigated using the thermoelectric transport measurements and first-principles calculations.We find that antiferromagnetic insulator CaMnO 3 breaks the Wiedemann–Franz law with the Lorenz number reaching …
The CaMnO3-based electrode enables much enhanced cyclability with a 620 mV smaller discharge-recharge voltage gap than that of the carbon-only cathode at a current rate of 50 mA gcarbon(-1). The improved performance is attributed to the high electrocatalytic activity of CaMnO3 with a porous nanostructure.
