TY - JOUR
T1 - Synthesis of ternary Si clathrates in the A-Al-Si (A = Na and K) system
AU - Imai, Motoharu
AU - Singh, Shiva Kumar
AU - Nishio, Mitsuaki
AU - Yamada, Takahiro
AU - Yamane, Hisanori
N1 - Publisher Copyright:
© 2015 The Japan Society of Applied Physics.
PY - 2015/7/1
Y1 - 2015/7/1
N2 - With the aim of producing functional materials based on earth-abundant elements, we examined the synthesis of the ternary type-I clathrates A8AlxSi46-x (A = Na and K). The type-I Si clathrate K7.9(1)Al7.1(1)Si38.9(4), having a lattice parameter of 10.434(1) A, was successfully synthesized via the direct reaction of K, Al, and Si by optimization of both the synthesis temperature and the molar ratios among the raw ingredients. K8Al7Si39 exhibited metallic conduction: its electrical resistivity increased with increasing temperature. The high pressure synthesis of Na8AlxSi46-x was also examined, using a belt-type apparatus and employing a mixture of NaSi, Al, and Si as the reagents. In this manner, the type-I Si clathrate Na8.7(9)Al0.5(1)Si45(2), having a lattice parameter of 10.211(1) A, was synthesized at 5.5GPa and 1570 K.
AB - With the aim of producing functional materials based on earth-abundant elements, we examined the synthesis of the ternary type-I clathrates A8AlxSi46-x (A = Na and K). The type-I Si clathrate K7.9(1)Al7.1(1)Si38.9(4), having a lattice parameter of 10.434(1) A, was successfully synthesized via the direct reaction of K, Al, and Si by optimization of both the synthesis temperature and the molar ratios among the raw ingredients. K8Al7Si39 exhibited metallic conduction: its electrical resistivity increased with increasing temperature. The high pressure synthesis of Na8AlxSi46-x was also examined, using a belt-type apparatus and employing a mixture of NaSi, Al, and Si as the reagents. In this manner, the type-I Si clathrate Na8.7(9)Al0.5(1)Si45(2), having a lattice parameter of 10.211(1) A, was synthesized at 5.5GPa and 1570 K.
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U2 - 10.7567/JJAP.54.07JC02
DO - 10.7567/JJAP.54.07JC02
M3 - Article
AN - SCOPUS:84936762224
SN - 0021-4922
VL - 54
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
IS - 7
M1 - 07JC02
ER -