Structural and vibrational study a new potassium lithium dihydrogenphosphate KLi(H2PO4)2

Rhimi, T.; Nguili, N.; Guermazi, S.; Bulou, A.; Toumi, Mohamed

doi:10.1016/j.vibspec.2016.05.008

Cited by 6 publications

(12 citation statements)

References 28 publications

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“…Regarding specifically LDP, it should be noted that Rhimi et al assigned a line at 402 cm −1 to LiO 4 , whereas Lee et al did not choose between PO 4 and LiO 4 . The main discrepancy compared with our investigations concerns the peak at 520 cm −1 attributed to PO vibration in earlier descriptions.…”

Section: Discussioncontrasting

confidence: 98%

“…Our assignment of the various Raman peaks to the different internal vibrational modes can be compared with the previous attributions proposed by Lee et al and Rhimi et al The main novelty of our investigations results into the attribution of bands lying at 398 or 399 cm −1 and around 513 or 520 cm −1 to LiO 4 vibrations in LDP and KLDP as well.…”

Section: Discussionsupporting

confidence: 75%

“…Furthermore, these authors considered the bands between 1,053 and 1,222 cm −1 as due to PO 4 bending or OH vibrations. More recently, within a similar Raman investigation, Rhimi et al attributed all Raman bands in the range 400–470 cm −1 to vibrations of ν 1 (LiO 4 ) from data recorded at room temperature …”

Section: Introductionmentioning

confidence: 78%

“…Among this family, potassium dihydrogen phosphate (KH 2 PO 4 ; KDP), ammonium dihydrogen phosphate (NH 4 H 2 PO 4 ), and potassium titanium phosphate (KTiOPO 4 ) are widely investigated for their interest in piezoelectricity, ferroelectricity, and nonlinear optics . LiH 2 PO 4 (LDP) and KLi(H 2 PO 4 ) 2 (KLDP) were studied only recently . The peculiarity in the structure of both materials is the presence of tetrahedra LiO 4 when compared with other crystals of MH 2 PO 4 family.…”

Section: Introductionmentioning

confidence: 99%

“…Regarding LDP, the aim of our study is to attempt to solve these ambiguities in the Raman line assignment from new studies as function of temperature from 30°C to 176°C. The second crystal, KLDP, was still less investigated than LDP, and only recently, Rhimi et al reported on X‐ray diffraction, Raman, and infrared data. They attributed the vibrational modes to H 2 PO 4 , LiO 4 entities, or OH bond, according to different wavenumber regions, from the comparison with spectra in LDP and KDP.…”

Section: Introductionmentioning

confidence: 99%

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Raman spectra in LiH₂PO₄ and KLi(H₂PO₄)₂: Mode assignment

Dekhili

Kauffmann

Aroui

et al. 2018

J Raman Spectroscopy

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We report and analyze Raman spectra recorded on crystals of LiH 2 PO 4 (LDP) and KLi(H 2 PO 4 ) 2 (KLDP). We provide a new and complete assignment of Raman lines in both crystals from their behavior as function of temperature. Among internal vibrations, we discern the modes within PO 4 tetrahedra, the modes related to Li-O bonds, and those due to the O-H vibrations. In the wavenumber range between 300 and 600 cm −1 , the lines associated with O-P-O or Li-O show different temperature dependencies. The bands of PO 4 are red-shifted with increasing temperature according to thermal dilatation, whereas the positions related to Li-O are temperature independent.

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Section: Discussioncontrasting

confidence: 98%

Section: Discussionsupporting

confidence: 75%

Section: Introductionmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Raman spectra in LiH₂PO₄ and KLi(H₂PO₄)₂: Mode assignment

Dekhili

Kauffmann

Aroui

et al. 2018

J Raman Spectroscopy

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Vapor pressure and specific electrical conductivity in the H2O–LiH2PO4–LiPO3 system—a novel electrolyte for water electrolysis at elevated temperature

Berg

Nikiforov

Bjerrum

2021

Ionics

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Lithium dihydrogen phosphate, LiH2PO4 (LDP) was studied for water electrolysis at elevated temperatures. It is shown that pure LDP, melting at ~224 °C and with correct DSC and X-ray diffraction diagram, in presence of sufficient humidity is stable up to 360 °C. Both solid and liquid LDP is structurally disordered and super-protonic conducting with conductivities reaching 0.48 S * cm -1 , when determined in sealed conductivity cells. The vapor pressure above LDP, pure and mixed with LiPO3 or H2O, was determined by means of Raman spectroscopy based on N2 as internal reference gas. Pressures up to ~20 bar at 350 °C were found and conductivities are given for solid and liquid states. Water splitting by electrolysis, 2H2O  2H2 + O2, was demonstrated by Raman spectroscopy at ~225°C and ~4.2 bar with Pt/W electrodes, thus showing that molten LDP has a significant potential for elevated temperature water electrolysis with high efficiency.

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