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- W2028717875 abstract "321 phases are an atypical series of MAX phases, in which A = As/P, with superior elastic properties, featuring in the MA-triangular-prism bilayers in the crystal structure. Until now, besides Nb3As2C, the pure phases of the other 321 compounds have not been realized, hampering the study of their intrinsic properties. Here, molten-salt sintering (MSS) and solid-state synthesis (SSS) were applied to synthesize As/P-containing 321 phases and 211 phases. Analyzing the phase composition of the end-product via multiple-phase Rietveld refinement, we found that MSS can effectively improve the purity of P-containing MAX phases, with the phase content up to 99% in Nb3P2C and 75.4(5)% in Nb2PC. In contrast, MSS performed poorly on As-containing MAX phases, only 8.9(4)% for Nb3As2C and 64(2)% for Nb2AsC, as opposed to the pure phases obtained by SSS. The experimental analyses combined with first-principles calculations reveal that the dominant formation route of Nb3P2C is through NbP + Nb + C → Nb3P2C. Moreover, we found that the benefits of MSS on P-containing MAX phases are on the facilitation of three considered chemical reaction routes, especially on Nb2PC + NbP → Nb3P2C. Furthermore, the intrinsic physical properties and Fermi surface topology of two 321 phases consisting of electron, hole, and open orbits are revealed theoretically and experimentally, in which the electron carriers are dominant in electrical transport. The feasible synthesis methods and the formation mechanism are instructive to obtain high-purity As/P-containing MAX phases and explore new MAX phases. Meanwhile, the intrinsic physical properties will give great support for future applications on 321 phases." @default.
- W2028717875 created "2016-06-24" @default.
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- W2028717875 date "1967-07-01" @default.
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- W2028717875 title "High superconducting transition temperatures in the molybdenum carbide family of compounds" @default.
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- W2028717875 doi "https://doi.org/10.1016/0022-5088(67)90055-0" @default.
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