Abstract
Two new quaternary nitrides, Li3Sr2MN4(M=Nb, Ta) have been synthesized from Li, Sr, and Nb or Ta metals under a flowing Ar–NH3atmosphere at 800°C under ambient pressure. The structures, determined by single crystal X-ray diffraction, are orthorhombic, space groupPnnm(No. 58) withZ=4, and have lattice parametersa=8.713(6) Å,b=9.007(4) Å,c=7.006(5) Å anda=8.700(6) Å,b=9.004(4) Å,c=7.000(3) Å forM=Nb and Ta, respectively. Refinement based uponFyieldedR=0.033 andRw=0.036 forM=Nb andR=0.035 andRw=0.045 forM=Ta. The structures are isotypic with Na2Li3MO4,M=Fe, Ga. TheMand two independent Li atoms are tetrahedrally coordinated by N atoms. EachMN4tetrahedron connects three Li(2)N4tetrahedra, one by edge-sharing and two by corner-sharing, to form a two-dimensional layer in thebcplane. These layers are linked together by Li(1) atoms to form the three-dimensional structure. The two Sr atoms occupy channels formed by N atoms along thecdirection. Crystalline Li3Sr2NbN4was synthesized by heating a Li3N–Sr2NbN3mixture at 750°C under an Ar atmosphere. Magnetic susceptibility data for Li3Sr2NbN4between 4 and 300 K exhibit temperature independent paramagnetism.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
