Role of MnO in manganese–borate binary glass systems: a study on structure and thermal properties

Abstract

Structural and thermal properties of xMnO−(100− x)B 2 O 3 (where x = 40, 50 and 60 mol%) glass samples have been investigated with the employment of various techniques. Fourier transform infrared spectroscopy results revealed the influence of MnO on glass matrix. Decrease of B-O bond-related band intensities has been observed. MnO addition was found to introduce broken [BO 2 O − ] n chains. Differential scanning calorimetry (DSC) measurements presented decreasing T g that indicates depolymerization of glass matrix in the considered compositional range. Moreover, thermal stability (TS) parameter has been evaluated using the DSC technique. It slightly decreased with MnO content. X-ray photoelectron spectroscopy results provided the evidence for Mn 2+ and Mn 3+ presence. Multiplet splitting, close to that of MnO, has been observed. It has been concluded that most of the manganese ions existed in the divalent state. Photoluminescence study revealed that manganese ions are tetragonally coordinated in a glassy matrix.

Exploration of temperature driven conduction process and ferroelectric properties of Mn doped GdCrO3

“…Figure 1(e) shows the Mn2p core level binding energy spectrum. The occurrence of Mn2p 3/2 peak at 641.9 eV and Mn2p 1/2 peak at 653.8 eV, with a spin-energy separation of 11.9 eV, suggests that manganese exists primarily in Mn 2+ state [17,18]. The peak position around 646.9 eV is attributed to co-existence of Mn 3+ and Mn 4+ of Mn2p 3/2 [19,20].…”

Synthesis, characterization, and thermoluminescence‐based high‐dose neutron and gamma dosimetry study of Al5BO9: Mn, Li nanophosphor

“…The broad band for both the spectra within 220-250 nm might be due to the host-related charge transfer transitions from O 2− (3d 5 ) to Al 3+ and Mn 2+ (2p 6 ), respectively. 43 According to Orgel's diagram, the bands within 250-320 nm for Al 5 BO 9 : Mn, Li samples may be attributed to the transitions from 6 A 1g to 4 E g levels, which are missing for undoped samples. 44 Figure 8 shows the PL emission spectra of the undoped Al 5 BO 9 and Al 5 BO 9 : xMn, 0.01Li (x = 0, 0.0025, 0.005, and 0.01) samples at the excitation wavelength of 250 and 290 nm, respectively.…”

“…Figure 7 shows the excitation spectra of both undoped and Mn‐doped Al 5 BO 9 samples when monitored excitation spectra at the emission wavelength of 432 and 567 nm, respectively. The broad band for both the spectra within 220–250 nm might be due to the host‐related charge transfer transitions from O 2− (3d 5 ) to Al 3+ and Mn 2+ (2p 6 ), respectively 43 . According to Orgel's diagram, the bands within 250–320 nm for Al 5 BO 9 : Mn, Li samples may be attributed to the transitions from 6 A 1g to 4 E g levels, which are missing for undoped samples 44 …”