Pressure-induced amorphization of La1/3TaO3

Noked, Ori; Melchior, A.; Shuker, R.; Livneh, Tsachi; Steininger, Ralph; Kennedy, Brendan J.; Sterer, Eran

doi:10.1016/j.jssc.2013.03.007

Cited by 8 publications

(2 citation statements)

References 44 publications

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“…The observed vibration modes were similar to those of La 1/3 NbO 3 and La 1/3 TaO 3 . 22), 23) Two Raman peaks at around 600 cm ¹1 came closer and overlapped to single Raman peak with an increase in x. This suggested the variation of crystal symmetry.…”

Section: Resultsmentioning

confidence: 80%

Effect of Li concentration on the ionic conductivity of LixLa(1−x)/3Nb0.80Ta0.20O3 solid solutions

Maruyama

Nagao

Watauchi

et al. 2021

J. Ceram. Soc. Japan

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In this study, we successfully synthesized Li x La (1¹x)/3 Nb 0.80 Ta 0.20 O 3 solid solutions with different Li concentrations (x = 0.000.30) by a solid-state reaction. With an increase in x, the crystal structure of Li x La (1¹x)/3 Nb 0.80 -Ta 0.20 O 3 initially changed from orthorhombic (0.00¯x¯0.05) to tetragonal (0.10¯x¯0.25) and then from tetragonal to cubic (x = 0.30). Grain sizes of Li x La (1¹x)/3 Nb 0.80 Ta 0.20 O 3 increased with an increase in x. Moreover, densified Li x La (1¹x)/3 Nb 0.80 Ta 0.20 O 3 pellets were obtained. Li x La (1¹x)/3 Nb 0.80 Ta 0.20 O 3 with x = 0.10 showed the highest ionic conductivity of 7.78 © 10 ¹5 S cm ¹1 at room temperature, which decreased with an increase in x from 0.10 to 0.30. Activation energies of Li x La (1¹x)/3 Nb 0.80 Ta 0.20 O 3 were in the range of 0.310.38 eV, which increased with an increase in x.

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Section: Resultsmentioning

confidence: 80%

Effect of Li concentration on the ionic conductivity of LixLa(1−x)/3Nb0.80Ta0.20O3 solid solutions

Maruyama

Nagao

Watauchi

et al. 2021

J. Ceram. Soc. Japan

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“…Perovskites' crystal chemistry is very rich, particularly under non-ambient conditions [2]. Recently, a subgroup of perovskite oxides, namely the A-site deficient Ln 1/3 MO 3 (Ln = La, Pr, Nd, M = Nb, Ta) oxides, was found to undergo irreversible pressure induced amorphization (PIA) at modest pressures around 14.5 GPa [3,4] for niobates (La 1/3 NbO 3 ) and around 18.5 GPa for tantalates Ln 1/3 TaO 3 [4,5]. PIA is subject of intensive research, since the observation of this phenomena in a number of simple materials including ice [6] and α-quartz [7] and in materials with special interest to geophysics such as Fe 2 SiO 4 [9] and Mg 2 SiO 4 [8].…”

Section: Introductionmentioning

confidence: 99%

Nb K-edge x-ray absorption investigation of the pressure induced amorphization in A-site deficient double perovskite La_1/3NbO₃

Marini

Noked

Kantor

et al. 2016

J. Phys.: Condens. Matter

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Nb K-edge x-ray absorption spectroscopy is utilized to investigate the changes in the local structure of the A-site deficient double perovskite La1/3NbO3 which undergoes a pressure induced irreversible amorphization. EXAFS results show that with increasing pressure up to 7.5 GPa, the average Nb-O bond distance decreases in agreement with the expected compression and tilting of the NbO6 octahedra. On the contrary, above 7.5 GPa, the average Nb-O bond distance show a tendency to increase. Significant changes in the Nb K-edge XANES spectrum with evident low energy shift of the pre-peak and the absorption edge is found to happen in La1/3NbO3 above 6.3 GPa. These changes evidence a gradual reduction of the Nb cations from Nb(5+) towards Nb(4+) above 6.3 GPa. Such a valence change accompanied by the elongation of the average Nb-O bond distances in the octahedra, introduces repulsion forces between non-bonding adjacent oxygen anions in the unoccupied A-sites. Above a critical pressure, the Nb reduction mechanism can no longer be sustained by the changing local structure and amorphization occurs, apparently due to the build-up of local strain. EXAFS and XANES results indicate two distinct pressure regimes having different local and electronic response in the La1/3NbO3 system before the occurence of the pressure induced amorphization at ∼14.5 GPa.

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Pressure-induced amorphization of A-site-deficient double perovskite Ln1/3MO3 (Ln = Pr, Nd, M = Nb, Ta)

Noked

Melchior²,

Shuker

et al. 2013

Phys Chem Minerals

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Pressure-induced amorphization of La1/3TaO3

Cited by 8 publications

References 44 publications

Effect of Li concentration on the ionic conductivity of Li<i><sub>x</sub></i>La<sub>(1−</sub><i><sub>x</sub></i><sub>)/3</sub>Nb<sub>0.80</sub>Ta<sub>0.20</sub>O<sub>3</sub> solid solutions

Effect of Li concentration on the ionic conductivity of Li<i><sub>x</sub></i>La<sub>(1−</sub><i><sub>x</sub></i><sub>)/3</sub>Nb<sub>0.80</sub>Ta<sub>0.20</sub>O<sub>3</sub> solid solutions

Nb K-edge x-ray absorption investigation of the pressure induced amorphization in A-site deficient double perovskite La_1/3NbO₃

Pressure-induced amorphization of A-site-deficient double perovskite Ln1/3MO3 (Ln = Pr, Nd, M = Nb, Ta)

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Pressure-induced amorphization of La1/3TaO3

Cited by 8 publications

References 44 publications

Effect of Li concentration on the ionic conductivity of Li<i><sub>x</sub></i>La<sub>(1−</sub><i><sub>x</sub></i><sub>)/3</sub>Nb<sub>0.80</sub>Ta<sub>0.20</sub>O<sub>3</sub> solid solutions

Effect of Li concentration on the ionic conductivity of Li<i><sub>x</sub></i>La<sub>(1−</sub><i><sub>x</sub></i><sub>)/3</sub>Nb<sub>0.80</sub>Ta<sub>0.20</sub>O<sub>3</sub> solid solutions

Nb K-edge x-ray absorption investigation of the pressure induced amorphization in A-site deficient double perovskite La1/3NbO3

Pressure-induced amorphization of A-site-deficient double perovskite Ln1/3MO3 (Ln = Pr, Nd, M = Nb, Ta)

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Nb K-edge x-ray absorption investigation of the pressure induced amorphization in A-site deficient double perovskite La_1/3NbO₃