High-pressure lattice-dynamics of NdVO4

Panchal, V.; Errandonea, Daniel; Manjón, F. J.; Múñoz, A.; Rodríguez‐Hernández, P.; Achary, S. N.; Tyagi, A. K.

doi:10.1016/j.jpcs.2016.10.001

Cited by 25 publications

(39 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Afterwards, we will focus on the influence of pressure on the absorptions related to Nd 3+ . These results will be correlated with the information known on the HP behavior of the crystal structure and Raman modes of NdVO4 [13][14][15][16]. The first phenomenon we observe is that the absorption edge gradually blue-shifts from ambient pressure to 4.7 GPa.…”

Section: High-pressure Studiessupporting

confidence: 82%

“…A second focus of research on NdVO 4 has been the influence of pressure on its properties and crystal structure. Numerous studies have been carried out, reporting the existence of a phase transition around 5-6 GPa [13][14][15][16]. Interestingly, it has been found that the crystal structure of the high-pressure (HP) phase strongly depends on the conditions of the experiment (namely, hydrostatic or non-hydrostatic conditions).…”

Section: Introductionmentioning

confidence: 99%

“…Interestingly, it has been found that the crystal structure of the high-pressure (HP) phase strongly depends on the conditions of the experiment (namely, hydrostatic or non-hydrostatic conditions). On the other hand, a second phase transition has been found to occur at 18-20 GPa, according to Raman and X-ray diffraction (XRD) experiments [13,14]. In contrast, optical-absorption experiments located this transition at 12 GPa.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Pressure Effects on the Optical Properties of NdVO4

et al. 2019

View full text Add to dashboard Cite

We report on optical spectroscopic measurements in pure NdVO4 crystals at pressures up to 12 GPa. The influence of pressure on the fundamental absorption band gap and Nd3+ absorption bands has been correlated with structural changes in the crystal. The experiments indicate that a phase transition takes place between 4.7 and 5.4 GPa. We have also determined the pressure dependence of the band-gap and discussed the behavior of the Nd3+ absorption lines under compression. Important changes in the optical properties of NdVO4 occur at the phase transition, which, according to Raman measurements, corresponds to a zircon to monazite phase change. In particular, in these conditions a collapse of the band gap occurs, changing the color of the crystal. The changes are not reversible. The results are analyzed in comparison with those deriving from previous studies on NdVO4 and related vanadates.

show abstract

Section: High-pressure Studiessupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Pressure Effects on the Optical Properties of NdVO4

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The symmetry annotations were made in accordance with the previous assignments reported in the literature. 10,11,27 Fig. 6 shows the UV-Vis diffuse reflectance spectrum of the NdVO 4 nanoneedles prepared in this study.…”

Section: Raman Analysismentioning

confidence: 99%

“…Under an applied pressure of about 6 GPa, Dragomir and Valant: Room-Temperature Synthesis and Optical Properties ... the zircon-type NdVO 4 undergoes a phase transformation to a metastable monazite-type structure with the space group P2 1 /n (Z = 4) where the Nd atoms are located in a eight-coordinate site (with eight unique Nd−O bond distances). 10,11 At around 11.4 GPa, NdVO 4 further transforms to a scheelite-type phase and so to a denser packing. All these phase transformations are accompanied by a decrease of the band gap by 0.5 eV (measured on a single crystal).…”

Section: Introductionmentioning

confidence: 99%

Room-Temperature Synthesis and Optical Properties of NdVO4 Nanoneedles

Dragomir

Valant²

2018

ACSi

View full text Add to dashboard Cite

Tetragonal NdVO 4 nanoneedles were prepared via a simple room-temperature precipitation method in the absence of any surfactant or template, starting from simple inorganic salts, NdCl 3 and Na 3 VO 4 , as raw materials. The nanoneedles were characterized by XRPD, SEM, Raman, PL, and lifetime spectroscopy. The particles have a length of about 100 nm and a diameter of 20 nm and grow along <112> direction. The advantages of this method lie in the high yield, non-toxic solvents, mild reaction conditions, and that it can potentially be employed for the preparation of other 1D lanthanide vanadates.

show abstract

Synthesis and characterization of Ti-doped ZrSiO4 at ambient and high-pressure conditions

et al. 2018

Self Cite

View full text Add to dashboard Cite

We have successfully synthesized for the first time a Ti-doped ZrSiO 4 powder (stoichiometry Zr 0.95 Ti 0.05 SiO 4 ) via a sol-gel route. The structural and vibrational properties have been characterized by X-ray diffraction, electron microscopy and Raman spectroscopy. Zr 0.95 Ti 0.05 SiO 4 has a tetragonal zircon-type structure with a = 6.5981(2) A ˚and c = 5.9810(2) A ˚. Eight of its Raman-active modes have been measured and assigned. We also performed high-pressure synchrotron X-ray diffraction experiments. The structural behavior was studied up to 31 GPa. At this pressure, we found evidence of the onset of a phase transition, coexisting the low-pressure polymorphs (zircon) with the typical high-pressure polymorph of ZrSiO 4 (reidite-type). From the analysis of unit-cell volume versus pressure using a Birch-Murnaghan equation of state, in the quasi-hydrostatic pressure regime (P \ 10.5 GPa), we have determined a bulk modulus of 297 GPa. This magnitude represents an enhancement of a 30% in the value of this parameter if compared with un-doped zircon-type ZrSiO 4 (bulk modulus \ 227 GPa). The low compressibility of Zr 0.95 Ti 0.05 SiO 4 converts this compound in a very good candidate for many technological applications. The effect of pressure on the linear compressibility of the lattice parameters is also analyzed.

show abstract

High-pressure lattice-dynamics of NdVO4

Cited by 25 publications

References 56 publications

Pressure Effects on the Optical Properties of NdVO4

Pressure Effects on the Optical Properties of NdVO4

Room-Temperature Synthesis and Optical Properties of NdVO4 Nanoneedles

Synthesis and characterization of Ti-doped ZrSiO4 at ambient and high-pressure conditions

Contact Info

Product

Resources

About