研究目的
To investigate the vibrational modes in LDP and KLDP in relation with the peculiarities of their structure and provide a new and complete assignment of Raman lines in both crystals from their behavior as function of temperature.
研究成果
The analysis of the behavior of Raman spectrum spectra of LDP and KLDP crystals as function of temperature has been used to propose a new assignment of Raman lines to PO4 and LiO4 entities in both crystals. The positions of these vibrations around 400 and 520 cm?1 are close in LDP and KLDP. This last result is consistent with neutron‐diffraction data reported by Hwan‐Oh et al. who observed that Li+ ions are quite immobile and stable in the structure.
研究不足
The temperature ranges have been chosen below the first structural transformations occurring at about 176°C in LDP and 125°C in KLDP. Thus, non‐monotonous changes in Raman lines caused by structural transitions were not considered here.
1：Experimental Design and Method Selection:
Raman spectra were recorded in the back‐scattering geometry with LabRAM HR Evolution (Horiba) under confocal Raman microscope. The system has a spectral resolution of 1 cm?1 using a 1,800 grooves per millimeter grating and is equipped with an ultra‐low wavenumber module to detect wavenumbers down to 5 cm?1. A 532‐nm diode laser light was focused on the sample with a 50× objective (Olympus).
2：A 532‐nm diode laser light was focused on the sample with a 50× objective (Olympus).
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: Measurements were performed from 30°C to 176°C on a polycrystalline LDP sample and from 30°C to 120°C on a KLDP single crystal.
3：List of Experimental Equipment and Materials:
LabRAM HR Evolution (Horiba), 532‐nm diode laser, 50× objective (Olympus), HFS temperature stage (Linkam).
4：Experimental Procedures and Operational Workflow:
Raman spectra were obtained in a wide spectral range 5–3,500 cm?1 as a function of temperature using an HFS temperature stage (Linkam).
5：Data Analysis Methods:
The analysis of the behavior of Raman spectrum spectra of LDP and KLDP crystals as function of temperature has been used to propose a new assignment of Raman lines to PO4 and LiO4 entities in both crystals.
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