Melting Behaviour of Bi1-xSbx Free Standing Alloy Nanoparticles Synthesized via Solvothermal Route

Devi, Mayanglambam Manolata; Biswas, Krishanu

doi:10.1590/1516-1439.335214

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Articles • Mater. Res. 18 (suppl 1) • Nov 2015 • https://doi.org/10.1590/1516-1439.335214 copy

Melting Behaviour of Bi_1-xSb_x Free Standing Alloy Nanoparticles Synthesized via Solvothermal Route

Authorship SCIMAGO INSTITUTIONS RANKINGS

The present investigation aims at understanding the effect of size on melting behaviour of free standing alloy nanoparticles. Alloy nanoparticles of Bi_1-xSb_x (x=0.12, 0.25, 0.50 and 0.75) have been synthesized by solvothermal route using sodium borohydride (NaBH₄) as a reducing agent. The samples were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The melting behaviour of alloys was determined by differential scanning calorimetry (DSC). The formation of different solid solution phases of Bi-Sb alloy has been confirmed by detailed XRD studies. Uniform cuboctahedral as well as spherical morphology of alloy nanoparticles has been observed in TEM with average particle size of 40±9 nm in Bi_0.75Sb_0.25 specimen. DSC studies indicate the depression in the melting temperature of the nanoparticles as compared to the bulk alloy of same composition.

Keywords:
solvothermal route; nanoalloys; X-ray diffraction; transmission electron microscopy; melting; solidification; differential scanning calorimetry

Alloy Compositions			Heating Cycle
			Alloy Nanoparticles			Bulk alloys
			Onset Temp (°C)	Peak Temp. (°C)	End set Temp. (°C)	Solidus Temp (°C)	Liquidus Temp (°C)
Bi_0.88Sb_0.12			264.97	275.17	295.63	280.12	326.21
Bi_0.75Sb_0.25			265.31	279.26	312.26	291.69	381.50
Bi_0.50Sb_0.50	1^st melting event (1^st cycle )		266.06	274.84	297.09	326.67	473.49
	1^st melting event (2^nd cycle )		266.64	273.36	306.69
	De-convolution of 2^nd melting event (1^st cycle )	Peak 1	614.35	640.93	665.38
	De-convolution of 2^nd melting event (1^st cycle )	Peak 2	623.65	646.19	672
	2^nd melting event (2^ndcycle)		616.81	644.62	662.80
Bi_0.25Sb_0.75	1^st melting event (1^st cycle)		266.94	273.14	290.84	396.26	552.96
	De-convolution of 2^nd melting event (1^st cycle)	Peak 1	616.51	643.37	669.92
	De-convolution of 2^nd melting event (1^st cycle)	Peak 2	635	649.45	658
	2^nd melting event (2^nd cycle)		604.07	648.47	683.36

Alloy Compo-sition	Radius of nanoparticle ( $r (N)$ )(nm)	Density ( $ρs$ ) (g/cm³)	Latent heat $Lm(N)$ (mJ/g)	Melting temp. of nanoparticle $T m (N)$ (°C)	Melting temp. of Bulk $T m (B)$ (°C)	Interfacial Energy $γ s l$ (mJ/m²)	Ref.
Bi_0.88Sb_0.12	22.3	9.61	4028.97	264.97	280.12	23.34	Present study
Bi_0.75Sb_0.25	20.5	9.18	5734.93	265.31	291.69	48.82	Present study
Pure Bi	Bulk	10.05	10.55 × 10⁶	-	271.4	95	Jones²¹21 Jones H. The solid-liquid interfacial energy of metals: calculations versus measurements. Materials Letters. 2002; 53(4-5):364-366. http://dx.doi.org/10.1016/S0167-577X(01)00508-0. http://dx.doi.org/10.1016/S0167-577X(01)...
Pure Sb	Bulk	6.68	19.89 × 10⁶	-	630.8	137	Jones²¹21 Jones H. The solid-liquid interfacial energy of metals: calculations versus measurements. Materials Letters. 2002; 53(4-5):364-366. http://dx.doi.org/10.1016/S0167-577X(01)00508-0. http://dx.doi.org/10.1016/S0167-577X(01)...

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