High Pressure Behavior of Sr3(VO4)2and Ba3(VO4)2

Grzechnik, Andrzej; McMillan, Paul F.

doi:10.1006/jssc.1997.7435

Cited by 50 publications

(41 citation statements)

References 15 publications

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“…The lengthening of the V-O bonds could be related to the increase of the average coordination number of the V> cations in the amorphous material. However, the broad Raman bands at about 750 and 600 cm\ due to the sixfold coordinated V atoms (19,20,26) are not visible in the collected spectra, although a broad spectral feature develops on the shoulder of the main V-O stretching band at about 790 cm\. This would suggest that even if there were a pressure-induced coordination change of the V atoms in amorphous Ca (VO ) at room temperature, the relative abundance of high-coordinated V atoms would not be high.…”

Section: Birch-murnaghan Equation Of State (Eos) (24)mentioning

confidence: 99%

“…The differences in the high-pressure behavior of Ba (VO ) and Sr (VO ) could be attributed to the relative size of the Ba> and Sr> cations (19,20). Ca (VO ) , disordered at ambient pressure, may be seen as an intermediate between amorphous and crystalline solids.…”

Section: Introductionmentioning

confidence: 95%

“…Pressure-induced structural changes in Ba (VO ) and Sr (VO ) were previously studied via Raman spectroscopy (19,20). The spectral changes in Ba (VO ) were interpreted as being due to condensation of VO\ units into edge-or corner-shared octahedra with little or no hysteresis on decompression.…”

Section: Introductionmentioning

confidence: 99%

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Amorphization of Ca3(VO4)2at High Pressure

Grzechnik

1998

Journal of Solid State Chemistry

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Section: Birch-murnaghan Equation Of State (Eos) (24)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

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Amorphization of Ca3(VO4)2at High Pressure

Grzechnik

1998

Journal of Solid State Chemistry

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“…19) These changes occurred at pressures greater than approximately 15 GPa. The changes in the vibrational spectra are likely associated with pressure induced changes in the lattice.…”

mentioning

confidence: 97%

“…Given the trend we observe in c/a, higher pressure (P > 10 GPa) neutron or x-ray diffraction measurements or raman spectra of Ba 3 Mn 2 O 8 are appropriate for further investigations of a potential high pressure phase transition as observed in similar compounds. 19) Unfortunately, current inelastic neutron scattering techniques do not allow for such high pressures to be reached at temperatures as low as T ≈ 2 K.…”

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confidence: 99%

Pressure Dependent Diffraction and Spectroscopy of a Dimerized Antiferromagnet

et al. 2011

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We present pressure dependent neutron diffraction and inelastic neutron scattering measurements of the dimerized antiferromagnet Ba 3 Mn 2 O 8 . The room temperature diffraction measurements reveal a linear decrease in lattice constant as a function of applied pressure. No structural transitions are observed. The low-temperature neutron spectroscopy measurements indicate a small change in magnetic scattering intensity in the vicinity of the spin gap for pressures up to P = 0.6 Gpa.KEYWORDS: neutron scattering, pressure effect, spin-dimers, antiferromagnet Quantum antiferromagnets are a good testing ground for examining and probing quantum critical points and phenomena.1-3) One such system which we have been studying is Ba 3 Mn 2 O 8 . This compound consists of coupled S = 1 Mn 5+ spin dimers arranged on a hexagonal lattice.4) Dimer layers are separated from one another along the crystallographic c-axis by Ba sites. Thermodynamic measurements have examined the spin-gap and established that the ground state is a non-magnetic singlet.5, 7) Inelastic neutron scattering measurements examining powders and single crystals determined the exchange connectivity and interactions. 8,9) Typical approaches to accessing quantum critical points in gapped spin liquid compounds include the application of applied magnetic fields and chemical substitution. Recently, non-magnetic substitution has also been studied in Ba 3 (Mn 1−x V x ) 2 O 8 , and a potential disordered random singlet ground state has been found. 10,11) Still another approach to perturbing the magnetic ground state of quantum antiferromagnets is to apply external pressure to the crystal structure. The distortion of the crystal structure via external pressure will affect the magnetic exchange interactions. Inelastic neutron scattering measurements are able to directly probe these effects by measuring the magnetic excitation cross-section. This has been done for the three dimensional dimer compound TlCuCl 3 12) and the two-dimensional spin dimer PHCC. 17) For the case of TlCuCl 3 , which has an intradimer exchange of J 0 ≈ 5 meV, 13) it was found that an external pressure of 0.11 GPa can completely close the singlet-triplet spin-gap, [14][15][16] whereas in PHCC the spin-gap is reduced by approximately 0.47 meV per GPa. The quantum spin ladder, IPA-CuCl 3 has also been examined as a function of pressure.18) For this system, it was found that the spin gap closed at a rate of approximately 0.23 meV per GPa. Here we examine the influence of pressure on the exchange interactions in the two-dimensional S = 1 disordered antiferromagnet Ba 3 Mn 2 O 8 . Ba 3 Mn 2 O 8 has an intradimer exchange constant of J 0 = 1.64 meV with a series of weaker interdimer exchanges. 9)

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Mn⁵⁺ Lifetime‐Based Thermal Imaging in the Optical Transparency Windows Through Skin‐Mimicking Tissue Phantom

Piotrowski

Marin

Szymczak

et al. 2022

Advanced Optical Materials

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conditions. We specifically demonstrated that 2D temperature maps of a thermal gradient can be obtained through tissue phantoms mimicking the optical properties of the skin using Ba 3 (VO 4 ) 2 :1% Mn 5+ , 0.5% Er 3+ nanophosphors as luminescent probes and a custom-made setup for lifetime-based luminescence thermometry.These results show the way for the development of ever more efficient luminescent nanothermometers based on doped luminescent centers (i.e., metal ions) that are bright and feature long, temperature-dependent lifetimes. The possibility to remotely and reliably monitor thermal gradients through 2.6 mm of tissue phantom further supports the recent trends in luminescence thermometry of shifting toward lifetime-based approaches, owing to their robustness and higher accuracy.

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High Pressure Behavior of Sr3(VO4)2and Ba3(VO4)2

Cited by 50 publications

References 15 publications

Amorphization of Ca3(VO4)2at High Pressure

Amorphization of Ca3(VO4)2at High Pressure

Pressure Dependent Diffraction and Spectroscopy of a Dimerized Antiferromagnet

Mn⁵⁺ Lifetime‐Based Thermal Imaging in the Optical Transparency Windows Through Skin‐Mimicking Tissue Phantom

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High Pressure Behavior of Sr3(VO4)2and Ba3(VO4)2

Cited by 50 publications

References 15 publications

Amorphization of Ca3(VO4)2at High Pressure

Amorphization of Ca3(VO4)2at High Pressure

Pressure Dependent Diffraction and Spectroscopy of a Dimerized Antiferromagnet

Mn5+ Lifetime‐Based Thermal Imaging in the Optical Transparency Windows Through Skin‐Mimicking Tissue Phantom

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Mn⁵⁺ Lifetime‐Based Thermal Imaging in the Optical Transparency Windows Through Skin‐Mimicking Tissue Phantom