(Sr3N)E and (Ba3N)E (E = Sb, Bi): Synthesis, Crystal Structures, and Physical Properties

• Published in: Zeitschrift für anorganische und allgemeine Chemie (1950) 2004-11, Vol.630 (13-14), p.2292-2298
• Main Authors: Gäbler, Frank, Kirchner, Martin, Schnelle, Walter, Schwarz, Ulrich, Schmitt, Miriam, Rosner, Helge, Niewa, Rainer
• Format: Article
• Language: English
• Subjects: Antimony; Bismuth; Crystal structures; Electrical resistivity; Electronic structure calculations; Magnetic properties; Nitrides; Perovskites
• ISSN: 0044-2313; 1521-3749
• DOI: 10.1002/zaac.200400256

Single phase powders of (Sr3N)Sb, (Sr3N)Bi ($Pm{\bar 3}m$, No. 221, Z = 1, Sb: a = 517.25(2) pm, V = 138.390(8) · 106 pm3, Bi: a = 520.691(8) pm, V = 141.170(4) · 106 pm3), (Ba3N)Sb, and (Ba3N)Bi (P63/mmc, No. 194, Z = 2, Sb: a = 753.33(3) pm, c = 664.45(3) pm, V = 326.56(2) · 106 pm3, Bi: a = 761.28(4) pm, c = 668.05(3) pm, V = 335.30(2) · 106 pm3) were obtained from reactions of melt beads of the respective elements with bulk compositions of A3E (A = Sr, Ba; E = Sb, Bi) in nitrogen atmosphere of ambient pressure at T = 1070 K (Sr) and T = 1120 K (Ba). The compositions were derived from chemical analyses and supported by Rietveld refinements based on powder X‐ray diffraction patterns. The Sr containing compounds crystallize in the cubic anti‐perovskite type arrangement, the Ba containing compounds in the hexagonal anti‐BaNiO3 structure type. Magnetic susceptibility and electrical resistivity data indicate that the compounds are diamagnetic semiconductors. The optical band gaps of (Sr3N)Sb and (Sr3N)Bi were determined by diffuse reflectivity to 1.15 eV and 0.89 eV, respectively. The experimental results are in agreement with electronic structure calculations. Chemical bonding is characterized in a simplified picture as ionic with significant orbital mixing. (Sr3N)E und (Ba3N)E (E = Sb, Bi): Synthese, Kristallstrukturen und physikalische Eigenschaften (Sr3N)Sb, (Sr3N)Bi ($Pm{\bar 3}m$, Nr. 221, Z = 1, Sb: a = 517, 25(2) pm, V = 138, 390(8) · 106 pm3, Bi: a = 520, 691(8) pm, V = 141, 170(4) · 106 pm3), (Ba3N)Sb, und (Ba3N)Bi (P63/mmc, Nr. 194, Z = 2, Sb: a = 753, 33(3) pm, c = 664, 45(3) pm, V = 326, 56(2) · 106 pm3, Bi: a = 761, 28(4) pm, c = 668, 05(3) pm, V = 335, 30(2) · 106 pm3) wurden als phasenreine Pulver durch Reaktionen von Schmelzperlen der Zusammensetzungen A3E (A = Sr, Ba; E = Sb, Bi) mit Stickstoff bei Temperaturen von T = 1070 K (Sr) und T = 1120 K (Ba) erhalten. Die Zusammensetzungen der Verbindungen wurde durch chemische Analysen bestimmt und mit Ergebnissen aus Rietveldverfeinerungen an Röntgenpulverdiffraktogrammen unterstützt. Die Sr‐Verbindungen kristallisieren im Strukturtyp des kubischen (anti‐)Perowskits, die Ba‐Verbindungen im hexagonalen (anti‐)BaNiO3‐Typ. Messungen der magnetischen Suszeptibilitäten und elektrischen Widerstände deuten auf das Vorliegen von diamagnetischen Halbleitern. An (Sr3N)Sb und (Sr3N)Bi wurden die optischen Bandlücken durch diffuse Reflexion zu 1, 15 eV und 0.89 eV bestimmt. Die experimentellen Befunde sind i