The ammonium ion in a silicate under compression: infrared spectroscopy and powder X-ray diffraction of NH4AlSi3O8—buddingtonite to 30 GPa

Vennari, Cara E.; O’Bannon, E. F.; Williams, Quentin

doi:10.1007/s00269-016-0844-3

Cited by 10 publications

(17 citation statements)

References 45 publications

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“…The results show that the N-H stretching vibration band(v3) shifts to higher frequencies with increasing temperature to 100 o C, and then to lower frequencies at higher temperatures. This trend indicates temperature-induced hydrogen bonding weakening at temperatures lower than 100 o C, and the next weakening of N-H bonding strength, which is on the contrary to the behavior of ammonium in feldspar under compression [1]. In addition, the diffusion rate of nitrogen is about 6.5 × 10 -13 m 2 /s at 1000 o C, which is one order of magnitude faster than nitrogen diffusion in phengite (7.9×10 -14 m 2 /s at 1000 o C) [3] This is the first report of high temperature behavior of ammonium in feldspar, and has implications for evaluating preservation and transfer of nitrogen during plate subduction.…”

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confidence: 79%

“…Knowledge of behavior of ammonium in feldspar at high temperatures and high pressures is very important to understand the preservation and transfer of nitrogen during subduction. However, there is only one report of behavior of ammonium in feldspar at high pressures [1]. It suggested that ammonium in feldspar is very stable and has little interaction with the feldspar lattice under compression, which is different from behavior of ammonium in phengite at high temperatures [2,3].…”

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confidence: 99%

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Stability of Ammonium in Feldspar at High Temperatures ：implications for Nitrogen Preservation and Transport in the Deep Earth

Huang¹,

Yan²

2020

Goldschmidt Abstracts

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confidence: 79%

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confidence: 99%

Stability of Ammonium in Feldspar at High Temperatures ：implications for Nitrogen Preservation and Transport in the Deep Earth

Huang¹,

Yan²

2020

Goldschmidt Abstracts

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“…It is likely that, at ambient temperature compression, the pressure did not affect the order-disorder and the displacive effects were too small to be detected by X-ray diffraction analysis. (6) In ammonium silicate buddingtonite collected by infrared spectroscopy under pressure, Vennari et al [16] found that the increased hydrogen bonds between the ammonium group and the silicate framework does not occur under compression and the NH 4 + group only appears as a guest ion in the aluminosilicate framework. They concluded that this lack of interaction may have an impact on the stability of ammoniated minerals and may favor nitrides of fluid phases as the N carrier in the deep mantle.…”

Section: Discussionmentioning

confidence: 99%

“…The N degassing from the Earth mantle can be monitored using 15 N isotope from volcanic gasses, and magmatic rocks, but the nitrogen stored in the mantle is much more difficult to quantify. Vennari et al [16], who investigated the high-pressure behavior of buddingtonite, an ammonium feldspar, showed how the ammonium behaves within minerals in relation to pressure, how this is relevant to understand the stabilization of ammonium in the high-pressure environments on Earth or other planets, and how the nitrogen can be recycled in planet interiors. Despite a large number of scientific cases concerning the engineering of new technological materials, and terrestrial and planetary environments, this system has been barely explored.…”

Section: Methodsmentioning

confidence: 99%

High Pressure Behavior of Mascagnite from Single Crystal Synchrotron X-ray Diffraction Data

et al. 2021

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High-pressure synchrotron X-ray diffraction was carried out on a single crystal of mascagnite, compressed in a diamond anvil cell. The sample maintained its crystal structure up to ~18 GPa. The volume–pressure data were fitted by a third-order Birch–Murnaghan equation of state (BM3-EOS) yielding K0 = 20.4(7) GPa, K0′ = 6.1(2), and V0 = 499(1) Å3, as suggested by the F-f plot. The axial compressibilities, calculated with BM3-EOS, were K0a = 35(3), K’0a = 7.7(7), K0b = 10(3), K’0b = 7(1), K0c = 25(1), and K’0c = 4.3(2) The axial moduli measured using a BM2-EOS and fixing K’0 equal to 4, were K0a = 52(2), K0b = 20 (1), and K0c = 29.6(4) GPa, and the anisotropic ratio of K0a: K0b: K0c = 1: 0.4: 0.5. The evolution of crystal lattice and geometrical parameters indicated no phase transition until 17.6 GPa. Sulphate polyhedra were incompressible and the density increase of 30% compared to investigated pressure should be attributed to the reduction of weaker hydrogen bonds. In contrast, some of them, directed along [100], were very short at room temperature, below 2 Å, and showed a very low compressibility. This configuration explains the anisotropic compressional behavior and the lowest compressibility of the a axis.

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“…The X-ray signs of injury are often difficult to discern and physicians need to understand the anatomy and pediatric elbow bone age and give a full estimate of the size of the fracture in the clinic. Fracture dislocation is not timely detected or the degree of fracture displacement is underestimated in many of these children, leading to delayed surgery and serious complications, such as delayed fracture healing and nonunion (6).…”

Section: Introductionmentioning

confidence: 99%

Image Fusion of X-ray and Magnetic Resonance Imaging-Based Evaluation of the Stability of Pediatric Lateral Humeral Condyle Fracture

Fang

et al. 2021

ircmj

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Background: Lateral humeral condyle fracture is the second most common intra-articular fracture in pediatric elbow. Objectives: The present study aimed to analyze the differences between X-ray and magnetic resonance imaging (MRI) in the evaluation of the stability of pediatric lateral humeral condyle fracture and the degree of fracture displacement. Methods: A total of 78 patients with acute elbow trauma were selected and hospitalized in our orthopedic department from July 2018-July 2019. All patients were examined with X-ray and MRI. The sensitivity and specificity of X-ray and MRI in the diagnosis of lateral humeral condyle fracture and the integrity of the trochlear cartilage chain fracture were calculated. The X-ray and MRI were examined respectively to check the value of lateral and posterior fracture space of lateral humeral condyle fracture. Results: Callus repair was observed according to the observation of fracture line during operation or the follow-up imaging examination of conservative treatment. It was confirmed that out of 78 patients with elbow joint trauma, 72 cases were diagnosed with the fracture of lateral condyle of humerus, and the other 6 patients were cured without fracture signs. The sensitivity of MRI in the diagnosis of pediatric lateral condylar fracture was 100%, which was significantly higher than that of X-ray (88.89%) (P<0.05). The results of X-ray and MRI in the diagnosis of pediatric lateral condylar fracture were generally consistent (kappa value = 0.465;< 0.01). Among the 72 confirmed cases, 35 subjects had a fracture of trochlear cartilage chain. The sensitivity of MRI in the diagnosis of pediatric fracture of lateral condyle of humerus was 97.14%, which was significantly higher than that of X-ray (62.86%) (P<0.05). The difference was statistically significant (P<0.05). The sensitivity of 3d-fs-fspgr or 3d-fspgr was significantly higher than that of fs-t2wi and fs-pdwi (P< 0.05). Conclusion: As evidenced by the obtained results, MRI was superior to X-ray in the diagnosis of pediatric humeral epicondylar fracture stability and evaluation of fracture displacement. Furthermore, 3d-fs-fspgr or 3d-fspgr was the best MR sequence to show the pediatric humeral epicondylar fracture. These findings can provide theoretical basis for the establishment of clinical treatment plan.

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The ammonium ion in a silicate under compression: infrared spectroscopy and powder X-ray diffraction of NH4AlSi3O8—buddingtonite to 30 GPa

Cited by 10 publications

References 45 publications

Stability of Ammonium in Feldspar at High Temperatures ：implications for Nitrogen Preservation and Transport in the Deep Earth

Stability of Ammonium in Feldspar at High Temperatures ：implications for Nitrogen Preservation and Transport in the Deep Earth

High Pressure Behavior of Mascagnite from Single Crystal Synchrotron X-ray Diffraction Data

Image Fusion of X-ray and Magnetic Resonance Imaging-Based Evaluation of the Stability of Pediatric Lateral Humeral Condyle Fracture

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