Syntheses, characterization and theoretical studies of three apatite-type phosphates MPb4(PO4)3 (M = K, Rb, Cs)

AZn(PO3)3 (A = K, Rb): Deep-Ultraviolet Nonlinear Optical Phosphates Derived from Synergy of a Unique [ZnO6] Octahedron and a [PO3]∞ Chain

“…Interestingly, a flexibility of the [PO 3 ] ∞ chains is evidenced: on going from smaller K + to larger Rb + , the interlayer distance between the [PO 3 ] ∞ chain pseudolayers (Figure ) has been expanded from 5.875 Å in KZn­(PO 3 ) 3 to 5.914 Å in RbZn­(PO 3 ) 3 . The [PO 4 ] local geometry has been only slightly varied: e.g., the P–O bond distances vary from 1.596–1.614 Å (Figure c) to 1.606–1.609 Å (Figure d) and the P–O–P bond angles change from 130.2 to 131.8°, respectively, which agree well with those reported in RbMgPO 4 ·6H 2 O and KPb 4 (PO 4 ) 3 . Meanwhile, the [ZnO 6 ] is distorted, showing a C 3 v symmetry in both KZn­(PO 3 ) 3 and RbZn­(PO 3 ) 3 with Zn–O = 2.082 or 2.084 Å and 2.076 or 2.093 Å, respectively (Figure e,f).…”

“…The [PO 4 ] local geometry has been only slightly varied: e.g., the P−O bond distances vary from 1.596− 1.614 Å (Figure 2c) to 1.606−1.609 Å (Figure 2d) and the P−O−P bond angles change from 130.2 to 131.8°, respectively, which agree well with those reported in RbMgPO 4 •6H 2 O 28 and KPb 4 (PO 4 ) 3 . 29 Meanwhile, the [ZnO 6 ] is distorted, showing a C 3v symmetry in both KZn(PO 3 ) 3 and RbZn(PO 3 ) 3 with Zn−O = 2.082 or 2.084 Å and 2.076 or 2.093 Å, respectively (Figure 2e,f). Despite the different coordination numbers, the Zn−O bond length is consistent with those of the 4-or 5-fold coordinated zinc in Cs 2 MgZn 2 (P 2 O 7 ) 2 , 30 RbLiZnP 2 O 7 , 31 and KZnCO 3 F. 32 Linear Optical Properties.…”

Langbeinite Phosphates KPbM2(PO4)3(M = Cr, Fe): Synthesis, Structure, Thermal Expansion, and Magnetic Properties Investigation

“…This could be due to the minor peaks, which are observed below and above the crystallization temperature (Figure S1). The peaks may come from the minor nonmagnetic impurity, such as KPb 4 (PO 4 ) 3 , detected in the precursor. However, the phase could not be observed in the recovered sample, which is confirmed by the XRD analysis.…”

“…Therefore, in the current work we mainly focused on the structural elucidation of these two compounds, study of their thermal expansion, and magnetic behavior. We introduced lead (Pb) into langbeinite structure because the substitution of Pb in phosphates has gained special attention to enhance the second harmonic generation (SHG) response, 42,43 where the high bonding efficiency resulted from its stereochemically active lone-pair electrons, 43,44 and to improve the properties as a result of size confinement 45 with respect to the existing KBaM 2 (PO 4 ) 3 (M = Cr, Fe) langbeinite phosphates. In addition to this, thermal expansion has been investigated as it is one of the important properties to access the material for high-temperature applications.…”

Microwave Metathesis Synthesis and Characterization of TMPO4 (TM = Cr, Mn, Fe, Co, Ni, Cu)

“…2 the FTIR spectrum of the samples are exhibited. The vibrations of ʋ1(PO4) [40,41] and ʋas(POP) [42] groups which are an evidence of formation of phosphate groups are listed in Table 3. Table 3.…”