Related Experiment Video
Updated: Dec 28, 2025

Ammonia Synthesis at Low Pressure
Published on: August 23, 2017
ThMnPnN (Pn = P, As): Synthesis, Structure, and Chemical Pressure Effects
Fuxiang Zhang1, Baizhuo Li2, Qingyong Ren3
1School of Physics & Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, P. R. China.
Abstract:
Mn-based ZrCuSiAs-type pnictides ThMnPnN (Pn = P, As) containing PbO-type Th2N2 layers were synthesized. The crystal and magnetic structures are determined using X-ray and neutron powder diffraction. While neutron diffraction indicates a C-type antiferromagnetic state at 300 K, the temperature dependence of the magnetic susceptibility shows cusps at 36 and 52 K respectively for ThMnPN and ThMnAsN. The susceptibility cusps are ascribed to a spontaneous antiferromagnetic-to-antiferromagnetic transition for Mn2+ moments, which is observed for the first time in Mn-based ZrCuSiAs-type compounds. In addition, measurements of the resistivity and specific heat suggest an abnormal increase in the density of states at the Fermi energy. The result is discussed in terms of the internal chemical pressure effect.
Related Concept Videos
¹H NMR: Pople Notation
A proton...
VSEPR Theory and the Effect of Lone Pairs
¹H NMR: Complex Splitting
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
Other Nuclides: 31P, 19F, 15N NMR
While fluorine-19 and phosphorous-31 have high natural abundances (100%) and positive gyromagnetic ratios, nitrogen-15 has a low natural abundance and a negative gyromagnetic ratio. However, nitrogen-15 is still preferred over nitrogen-14 (which has a...
π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds
Structure of Amines

