The crystal structure, electronic, and magnetic properties of NaPd$_3$Ge$_2$

Ali, Mazhar N; von Rohr, Fabian; Campana, C; Schilling, Andreas; Cava, R J (2015). The crystal structure, electronic, and magnetic properties of NaPd$_3$Ge$_2$. Materials Research Bulletin, 70:673-677.

Abstract

Crystals of NaPd$_3$Ge$_2$, (X = Si, Ge, Sn) were synthesized and their crystal structures investigated by single crystal X-ray diffraction. The previously reported structures of NaPd$_3$Si$_2$ and NaPd$_3$Sn$_2$ were confirmed. NaPd$_3$Ge$_2$ was found to have a different unit cell from that originally reported; therefore the structure was solved. It is an orthorhombically distorted version of the hexagonal CeCo$_3$Be$_2$-type structure, in space group Imma, with cell parameters a = 7.244(1) Å, b = 9.938(1) Å, c = 5.767(2) Å. The originally reported cell is explained through triple twinning of the true cell. The structure of NaPd$_3$Ge$_2$ fits the trend of decreasing X–X dimerization as a function of increasing period from Si–Sn. All three compounds are metals showing weak diamagnetism with increasing resistivity from NaPd$_3$Si$_2$–NaPd$_3$Sn$_2$; no superconductivity is observed down to 2 K.

Crystals of NaPd$_3$Ge$_2$, (X = Si, Ge, Sn) were synthesized and their crystal structures investigated by single crystal X-ray diffraction. The previously reported structures of NaPd$_3$Si$_2$ and NaPd$_3$Sn$_2$ were confirmed. NaPd$_3$Ge$_2$ was found to have a different unit cell from that originally reported; therefore the structure was solved. It is an orthorhombically distorted version of the hexagonal CeCo$_3$Be$_2$-type structure, in space group Imma, with cell parameters a = 7.244(1) Å, b = 9.938(1) Å, c = 5.767(2) Å. The originally reported cell is explained through triple twinning of the true cell. The structure of NaPd$_3$Ge$_2$ fits the trend of decreasing X–X dimerization as a function of increasing period from Si–Sn. All three compounds are metals showing weak diamagnetism with increasing resistivity from NaPd$_3$Si$_2$–NaPd$_3$Sn$_2$; no superconductivity is observed down to 2 K.

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Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics English 2015 25 Jan 2016 15:15 05 Apr 2016 19:56 Elsevier 0025-5408 https://doi.org/10.1016/j.materresbull.2015.05.040
Permanent URL: https://doi.org/10.5167/uzh-119718