New Layered Polyborates Cs₂M₂B₁₀O₁₇ (M = Na, K)

Abstract

The polyborates Cs(2)M(2)B(10)O(17) (M = Na, K) have been prepared and their structures determined by single-crystal X-ray diffraction methods. They crystallize in the monoclinic space group C2/c (Z = 8) with unit-cell parameters a = 21.643(3) Å, b = 6.558(2) Å, c = 11.072(2) Å, beta = 105.43(1) degrees, V = 1514.8(6) Å(3) for the Na compound and a = 22.547(9) Å, b = 6.614(2) Å, c = 11.288(4) Å, beta = 103.25 degrees, V = 1638.3(8) Å(3) for the K analogue. The new structural type contains a 2-dimensional borate matrix that is built from a complete condensation of the ring system B(5)O(11). The Cs atoms reside within the borate matrix, and the Na (K) atoms are placed between the thick Cs borate sheets.

Three Mixed-Alkaline Borates: Na2M2B20O32 (M = Rb, Cs) with Two Interpenetrating Three-Dimensional B-O Networks and Li4Cs4B40O64 with Fundamental Building Block B40O77

“…When the A/B value is less than 1, most of them show a 3D framework and contain high-polymerized B-O groups. However, the B-O groups display 2D layered configurations in the structure of M 2 Cs 2 ­B 10 O 17 (M = Na, K), CsB 5 O 8 ( P 2 1 / c , P 2 1 / n ), , M 3 B 7 O 12 (M = Rb, Cs) ( P 1̅, C 2/ c ), , Cs 3 B 13 ­O 21 , RbB 3 ­O 5 ( C 2/ c ), Rb 2 B 4 ­O 7 ( P 1̅), LiB 6 ­O 9 F, Na 11 B 21 ­O 36 Q 2 (Q = Cl, Br), and 1D B-O chains, isolated B-O groups can be found in Li 2 B 3 ­O 4 F 3 , Na 2 B 4 ­O 7 ( P 1̅), respectively, although the A/B value is less than 1.…”

Synthesis and characterization of a new quaternary borate Na2Cs2Sr(B9O15)2 with the unprecedented [B9O19]11− group, notation of 3 × (3:2Δ + T)

“…For instance, the investigation of subsolidus phase relations in the system of Na 2 O-SrO-B 2 O 3 led to the discovery of four ternary phases, NaSrBO 3 , NaSr 4 (BO 3 ) 3 , NaSrB 5 O 9 , and Na 3 SrB 5 O 10 [5][6][7][8]. Additionally, exploration on the Na 2 O-Cs 2 O-B 2 O 3 system afforded two compounds, namely, Na 2 CsBO 3 and Na 2 Cs 2 B 10 O 17 [9,10].…”

Cu3Sn – understanding the systematic absences

“…Within materials science, research on the lead-free solders, which are developed on the basis of Sn as one of the main components, has been the focus of studies of Cu 3 Sn (Suganuma, 2001). Due to the strong driving force towards miniaturization, the impact of intermetallic compounds such as Cu 3 Sn on the short-and long-term stability of the solder joint has been studied extensively (Tu, 1973(Tu, , 1996(Tu, , 2007Tu & Thompson, 1982;Bader et al, 1995;Harris & Chaggar, 1998;Warwick & Muckett, 1983;Sunwoo et al, 1992;Yoon et al, 2003;Plumbridge, 2007;Wang et al, 2010;Gao & Qu, 2012;Yang et al, 2013;Tsai et al, 2010;Paul et al, 2011;Cheng et al, 2012). Outside the soldering community, Cu 3 Sn has gained interest as a non-noble metallic oxidation catalyst.…”

“…Three different superstructure models exist so far: the disordered Cu 3 Ti structure type, the ordered eightfold Cu 3 Ti superstructure and the ordered tenfold Cu 3 Ti superstructure. Beside those experimentally proven structure models, lattice parameters for a sevenfold superstructure have been presented in reviews on the impact of Cu 3 Sn in solders without proper citation (Klein-Wassink, 1989;Tu, 1996;Evans, 2007). This additional model will not be discussed any further.…”