Crystal structure and magnetic properties of Sm3CuGeS7 and Sm3CuGeSe7

Syntheses and characterization of two new selenides Ba5Al2Se8 and Ba5Ga2Se8

“…Chalcogenides are an interesting class of materials with amazing structural complexity [1][2][3][4][5][6] and important properties including thermoelectricity [7][8][9][10], magnetic property [11][12][13][14], nonlinear optical property [15,16], photovoltaicity [17], superconductivity [18], and luminescent property [19,20]. In the past years, many ternary chalcogenides in the A/M/Q system (A = alkaline-earth metal; M = Al, Ga, In; Q = S, Se, Te) have been discovered and studied, including the large family of the AM 2 Q 4 compounds [21][22][23][24][25], the A 2 M 2 Q 5 compounds [26], Ba 5 Ga 2 S 8 [27], Ba 4 Ga 2 S 7 [28], Ba 3 Ga 2 S 6 [28], and Mg 5 Al 2 Se 8 [29].…”

Synthesis, structure, magnetic and photoelectric properties of Ln3M0.5M′Se7 (Ln = La, Ce, Sm; M = Fe, Mn; M′ = Si, Ge) and La3MnGaSe7

“…[7][8][9][10][11][12][13][14][15][16] Therefore, the discoveries of new rare earth based chalcogenides are important and intriguing.…”

“…[1][2][3][4][5][6] Among the large family of chalcogenides, the rare earth chalcogenides have much more complex electronic conguration than the d-and p-block metal chalcogenides, resulting in their promising potentials for thermal, electrical, magnetic and optical applications. [7][8][9][10][11][12][13][14][15][16] Therefore, the discoveries of new rare earth based chalcogenides are important and intriguing.…”

“…This structure type can tolerate various combinations of M and M 0 , which provides us the capabilities to tune the properties of these compounds. The most common combinations of M and M 0 are: (i) monovalent M (Na + , Ag + or Cu + ) and tetravalent M 0 (Si 4+ , Ge 4+ or Sn 4+ ), 9,11,12,[15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] (ii) divalent M (Mg 2+ , Mn 2+ , Fe 2+ , Co 2+ or Zn 2+ ) and trivalent M 0 (Al 3+ , Ga 3+ , In 3+ or Fe 3+ ). [31][32][33][34] These two types of combinations demand that the valence of M and M 0 must sum up to 5.…”

“…7 , exhibit no obvious magnetic transition and their inverse magnetic susceptibilities are curvilinear in low temperature region 10,12,33. Fitting the inverse magnetic susceptibility to modified Curie-Weiss law in high temperature region in several cases leads to negative θ p , indicating weak antiferromagnetic coupling interactions dominant in these compounds.…”