TY - JOUR
T1 - Synthesis and characterization of KTh2SeE6, KTh2Te6 and CsTh2Se6
AU - Wu, Eric J.
AU - Pell, Michael A.
AU - Ibers, James A.
N1 - Funding Information:
This work was supported by NSF grant No. DMR91-14934. Use was made of tb ,~ MRL central facilities supported by the National Sctence Foundation at the Materials Research Center of Northwestern University under Grant No. DMR91-20521.
PY - 1997/6/22
Y1 - 1997/6/22
N2 - The compounds KTh2Se6, KTh2Te6 and CsTh2Se6 have been synthesized in the temperature range 873 to 923 K. These compounds are isostructural with the previously synthesized compound CsTh2Te6. They crystallize in the space group D172h-Cmcm of the orthorhombic system with two formula units in cells: a=4.14(2) Å, b=21.88(4) Å, c=5.64(1) Å, V=511(4) Å3 (T=298 K) for KTh2Se6; a=4.356(1) Å, b =23.702(7) Å, c=6.141(2) Å, V=634.1(3) Å3 for KTh2Te6 (T=113 K); and a=4.14(5) Å, b=23.88(4) Å, c=5.67(5) Å, V=561(13) Å3 (T=298 K) for CsTh2Se6. The structure of KTh2Te6 has been determined from single-crystal X-ray data. The structure is composed of 2∞[Th2Te-6] layers that stack perpendicular to [010]. The layers are separated by K+ cations that are coordinated to eight Te atoms at the corners of a rectangular parallelepiped. The K site is one-half occupied. Te atoms form infinite chains within the layers along [001] with Te-Te distances between 3.057(3) Å and 3.085(3) Å. KTh2Se6, KTh2Te6 and CsTh2Se6 are highly resistive along [100].
AB - The compounds KTh2Se6, KTh2Te6 and CsTh2Se6 have been synthesized in the temperature range 873 to 923 K. These compounds are isostructural with the previously synthesized compound CsTh2Te6. They crystallize in the space group D172h-Cmcm of the orthorhombic system with two formula units in cells: a=4.14(2) Å, b=21.88(4) Å, c=5.64(1) Å, V=511(4) Å3 (T=298 K) for KTh2Se6; a=4.356(1) Å, b =23.702(7) Å, c=6.141(2) Å, V=634.1(3) Å3 for KTh2Te6 (T=113 K); and a=4.14(5) Å, b=23.88(4) Å, c=5.67(5) Å, V=561(13) Å3 (T=298 K) for CsTh2Se6. The structure of KTh2Te6 has been determined from single-crystal X-ray data. The structure is composed of 2∞[Th2Te-6] layers that stack perpendicular to [010]. The layers are separated by K+ cations that are coordinated to eight Te atoms at the corners of a rectangular parallelepiped. The K site is one-half occupied. Te atoms form infinite chains within the layers along [001] with Te-Te distances between 3.057(3) Å and 3.085(3) Å. KTh2Se6, KTh2Te6 and CsTh2Se6 are highly resistive along [100].
KW - Solid-state compounds
KW - Synthesis
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U2 - 10.1016/S0925-8388(96)02838-1
DO - 10.1016/S0925-8388(96)02838-1
M3 - Article
AN - SCOPUS:0031167029
SN - 0925-8388
VL - 255
SP - 106
EP - 109
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
IS - 1-2
ER -