TY - JOUR
T1 - High-pressure metallization and amorphization of the molecular crystal Sn(IBr)2
AU - Machavariani, G. Yu
AU - Rozenberg, G. Kh
AU - Pasternak, M. P.
AU - Naaman, O.
AU - Taylor, R. D.
N1 - Funding Information:
We thank I. Goldberg and U. Shmueli for their help in the Sn(IBr) 2 structure determination. This work was partially supported by grants from the USA–Israel Binational Science Foundation, Grant BSF #95-00012 and the German–Israel Science Foundation, Grant GIF #I-086.401.
PY - 1999/4/2
Y1 - 1999/4/2
N2 - An insulator-to-metal transition concurring with amorphization is found in the cubic (Pa3̄) molecular crystal Sn(IBr)2 at P ≈ 20 GPa. Measurements were carried out with diamond-anvil cells at pressures up to approx. 30 GPa using resistance measurements, X-ray diffraction (XRD), and 119Sn Mossbauer spectroscopy (MS). With increasing pressure a new crystalline phase is observed in the 10-23 GPa range; at P ≈ 16 GPa, a gradual onset of structural disorder is first observed, and full amorphization takes place at P ≥ 23 GPa. Both electronic properties as measured by R(P, T) and MS data are consistent with a gradual growth of disordered (SnI2Br2)n polymeric chains, formed by intermolecular I-I bonding allowing for electronic delocalization to occur. Upon decompression both XRD and 119Sn MS show a significant pressure hysteresis.
AB - An insulator-to-metal transition concurring with amorphization is found in the cubic (Pa3̄) molecular crystal Sn(IBr)2 at P ≈ 20 GPa. Measurements were carried out with diamond-anvil cells at pressures up to approx. 30 GPa using resistance measurements, X-ray diffraction (XRD), and 119Sn Mossbauer spectroscopy (MS). With increasing pressure a new crystalline phase is observed in the 10-23 GPa range; at P ≈ 16 GPa, a gradual onset of structural disorder is first observed, and full amorphization takes place at P ≥ 23 GPa. Both electronic properties as measured by R(P, T) and MS data are consistent with a gradual growth of disordered (SnI2Br2)n polymeric chains, formed by intermolecular I-I bonding allowing for electronic delocalization to occur. Upon decompression both XRD and 119Sn MS show a significant pressure hysteresis.
UR - http://www.scopus.com/inward/record.url?scp=0033515327&partnerID=8YFLogxK
U2 - 10.1016/S0921-4526(98)01336-2
DO - 10.1016/S0921-4526(98)01336-2
M3 - מאמר מכנס
AN - SCOPUS:0033515327
VL - 265
SP - 105
EP - 108
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
SN - 0921-4526
IS - 1-4
ER -