Particle Size and Shape Engineering for Advanced Materials

Ningthoujam, Raghumani Singh; Tyagi, A. K.

doi:10.1007/978-981-16-1803-1_5

Cited by 1 publication

(1 citation statement)

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“…The negative Gibbs energy values calculated by using the Factsage package (Figure 4), 60 along with the relevant thermodynamic data and phase diagrams reported in the literature 1,6,11,23,60–70 suggest that the reaction between a transition metal or rare earth metal, and elemental boron is thermodynamically favourable, at all the temperatures, which is the thermodynamic basis behind various synthesis routes, including the conventional high-temperature and high pressure arc-melting, 71,72 high temperature solid-state reaction, 73,74 as well as long time mechanical alloying. 74–76 Given the extremely exothermic nature of Reaction (1), 1,6,60–70 the so-called self-propagating high-temperature synthesis (SHS) was also used. 77,78 These synthesis approaches suffer from various disadvantages, for example requirement of high temperature/pressure and/or long processing time and/or high agglomeration of product boride.…”

Section: Molten Salt Synthesis Of Binary Metal Boridesmentioning

confidence: 93%

Low temperature controllable synthesis of transition metal and rare earth borides mediated by molten salt

Liu,

Jia,

Zhang

et al. 2024

International Materials Reviews

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Transition meal and rare earth borides have been subjected to extensive investigations because of their unique structures, superior properties and diverse applications. Conventional methods for their syntheses suffer from various drawbacks. So several alternative approaches have been explored. Among them, the so-called ‘molten salt synthesis (MSS)’ technique has proved promising. Over the past 10–15 years, it has been used to prepare a range of transition metal and rare earth borides. In this paper, the main results from these studies are reviewed. Initially, the relevant background on metal borides and their conventional synthesis methods are introduced, followed by the main principles/mechanisms of MSS. The following three sections provide an overview of the main work on MSS of binary and ternary borides, boride solid solutions, and boride-based composite powders. Then, two newly modified MSS approaches are presented. Finally, the main issues covered in this paper are summarised, and future prospects considered.

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