Low-temperature route to shandite Ni3Pb2S2: A study of preparation via ethylene glycol reflux

Conversion Reactions of Solids: From a Surprising Three‐Step Mechanism towards Directed Product Formation

“…Along the line AX+M, bulk powders of cubic PbS and orthorhombic SnS can be transformed with Ni at elevated temperatures ( T >400 °C, path 1) in pure solid‐state reactions into trigonal‐layered shandite‐type Ni 3 Pb 2 S 2 and isotypic Ni 3 Sn 2 S 2 . This path is also used under mild conditions ( T =166–197 °C) from SnS and PbS nanoparticles in a reductive solution of Ni 2+ . A diffusion‐driven mechanism was proven for the formation of the ternaries, whereas core‐shell particles Ni@SnS are formed by a more rapid reduction.…”

“…Their formation and binary side products depend on kinetics and equilibriums of dissolution and redox reactions. A diffusion‐driven transformation was concluded similar to the conversion of PbS to Ni 3 Pb 2 S 2 . In both cases, binary chalcogenide precursors AX are converted to perovskite‐related M 3 A 2 X 2 =M 1.5 AX compounds by adding the transition‐metal Ni.…”

“…A diffusion‐driven transformation was concluded similar to the conversion of PbS to Ni 3 Pb 2 S 2 . In both cases, binary chalcogenide precursors AX are converted to perovskite‐related M 3 A 2 X 2 =M 1.5 AX compounds by adding the transition‐metal Ni. As from solid‐state reactions pyrite‐type PtSnS is formed from SnS+Pt, hypothetical “NiAX” was computed from total‐energy DFT calculations.…”

Many Faces of Ni3Bi2S2: Tunable Nanoparticle Morphology via Microwave-Assisted Nanocrystal Conversion

“…Reduced nickel diffusion into the Bi 2 S 3 crystal structure was initially considered as a driving force of the reaction . The same reaction mechanism was proposed for Ni 3 Pb 2 S 2 , too . Later investigations of the reaction mechanism proved its complexity: it was assumed that formation of NiBi and Bi intermediates plays an important role in the reaction pathway., , The two-step morphological templating was proposed for the synthesis of Ni 3 Bi 2 S 2 starting from bismuth; however, the retention of the starting material size and shape was observed only in the case when the morphology of the precursor was spherical.…”

Reaction of Ni2+ and SnS as a Way to Form Ni@SnS and Sn2Ni3S2 Nanocrystals: Control of Product Formation and Shape

“…By varying reaction parameters, the formation of core-shell particles, Sn 2 Ni 3 S 2 ,N i 3 S 2 ,a nd Ni 1.523 Sn can be controlled from am odified polyol synthesis for isotypic Pb 2 Ni 3 S 2 . [24] This study serves as ap rototype for the formation of similaro rc ompletely new phases by carefully adjusting the general method. [26] which are apparent in the phase diagram.…”