Interrelationship of Micro- and Macrostructure with Physical Properties of Noncentrosymmetric Germanates

Vibrational and optical identification of GeO2 and GeO single layers: a first-principles study

“…16 The exciton characteristic in the rutile phase was attributed to direct-forbidden transitions, and this finding was recently supported by a theoretical prediction. 17 Further, the a-phase is a piezoelectric material 18,19 and displays advanced non-linear optical properties compared to a-SiO 2 , 20,21 while the highcrystalline lattice environment inside the r-GeO 2 leads to high thermal conductivity 22 and high carrier mobility 23 compared to b-Ga 2 O 3 . In addition, the a-phase was reported to be suitable to integrate into the surface acoustic wave devices as a substrate.…”

Electronic Structure of Noncentrosymmetric α-GeO2 with Oxygen Vacancy: Ab Initio Calculations and Comparison with Experiment

“…Recently, however, it has been shown by theoretical methods that the α-quartz-type GeO 2 (α-GeO 2 ) vibrational parameters are very sensitive to the presence of the vacancy in the oxygen sublattice . This polymorph modification is particularly interesting because α-GeO 2 , space group P 3 1 21 or P 3 2 21, possesses a wide optical transparency range and piezoelectric and nonlinear optical properties. ,− The α-GeO 2 crystal structure is shown in Figure . , During recent years, the α-GeO 2 crystal flux growth technology has been developed, and now large, free of hydroxyl groups, high-stability single crystals are available. ,, Thus, the present study is aimed at the evaluation of α-GeO 2 electronic structure. The electronic parameters are planned to be explored in parallel by experimental and theoretical methods.…”

Low-Temperature Synthesis and Structural Properties of PbMoO4 Nanocrystals

“…In the present study, the low-temperature precipitation method is developed to prepare the PbMoO4 microcrystals with uniform morphology. Earlier, similar precipitation techniques in water-based solutions were successfully used for the preparation of several simple oxides with different micromorphology and now it is interesting to reveal the potentials of this method for the synthesis of binary oxides [24][25][26][27][28] .…”