Effect of oxygen on the properties of zirconium at high temperatures

Kornilov, I.I.; Glazova, V.V.; Kenina, E. M.

doi:10.1007/bf01371869

Cited by 5 publications

(4 citation statements)

References 2 publications

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“…It is known that N 2 molecules can be in two ground states: at medium temperatures the adsorption of N 2 is dissociativethe molecules fragment, the atoms occupy centers with a strong bond with a binding energy ∼ 3 eV on molybdenum and 3−4 eV on other metals (Re, W, Fe)[16]. The concentration N of such centers is close to the concentration of surface metal atoms; for example, for the face (100)Mo N ≈ 10 15 cm −2 , and the probable location of the atom -" pits" between four metal atoms, as this was also observed for other gases, for example, oxygen on the face (100)W[16,17]. At low temperatures and even more at high pressures P ≈ 10−760 Torr, all strongly…”

supporting

confidence: 60%

“…As expected, the results obtained almost completely coincided with the experiments when pure nitrogen was injected into the chamber. The gas with second concentration in the air is oxygen, which on metals is close to nitrogen in terms of adsorptiondesorption properties [17,18]. The remaining impurity gases, apparently, do not make any significant contribution to the physics of the operation processes of the Pirani-type sensor.…”

Section: Resultsmentioning

confidence: 99%

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Physical processes in the Pirani type low vacuum sensor

Rut’kov

Beliaeva²,

Gall

2023

Technical Physics

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Auger electron spectroscopy and thermoresistive methods are used to study the physical processes leading to gas cooling of heated molybdenum filaments in a wide temperature range of 350-1300 K and pressures of 760-10-3 Torr, corresponding to the operating range of a Pirani-type vacuum sensor. Nitrogen was used as the gas. It is shown that nitrogen atoms chemisorbed on the surface do not contribute to gas cooling, which occurs only due to physisorbed N2 molecules. In the intermediate vacuum region of 10-3-1 Torr, the heater is cooled due to the equilibrium between the flux of incident and thermally desorbed molecules, which is well described by the Hertz--Knudsen formula and first-order desorption with an activation energy of ~0.55 eV. On the contrary, at high pressures close to atmospheric, this cooling occurs due to the thermal desorption of gas molecules from an almost filled monolayer, which reduces its relative efficiency by many orders of magnitude. Keywords: vacuum, adsorption, Pirani sensor, molybdenum, thermal desorption, nitrogen.

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supporting

confidence: 60%

Section: Resultsmentioning

confidence: 99%

Physical processes in the Pirani type low vacuum sensor

Rut’kov

Beliaeva²,

Gall

2023

Technical Physics

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“…Solid solutions of oxygen in zirconium belong to the category of interstitial phases, i.e. solutions in which relatively small oxygen atoms (whose atomic radius is 0.066 nm) are located at interstices sublattices of Zr atoms (in α-Zr, the atomic radius is R = 0.16 nm) [27,32,33]. In the α-zirconium lattice, oxygen atoms occupy octahedral positions.…”

Section: Effect Of Oxygenmentioning

confidence: 99%

Influence of interstitial elements (oxygen, nitrogen) on properties of zirconium alloys (review)

Trush

Pylypenko

Stoev

et al. 2022

Phys. Chem. Solid St.

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A review of the regularities of the influence of interstitial elements (oxygen, nitrogen) on the properties of zirconium alloys was presented. It was noted that in the scientific and technical literature dates the main attention is paid to the bulk alloying of zirconium alloys with oxygen and nitrogen at high temperatures. It was shown that zirconium with nitrogen and oxygen forms a number of stable compounds of suboxides and subnitrides. The physico-mechanical characteristics of zirconium after heat treatment under media containing both oxygen and nitrogen components on the properties of zirconium alloys were analysed. Наведено літературний огляд закономірностей впливу елементів проникнення (кисню, азоту) на властивості цирконієвих сплавів. Наголошено, що у науково-технічній літературі основну увагу приділено об'ємному легуванню цирконієвих сплавів киснем та азотом. Показано, що цирконій з азотом та киснем утворює ряд стабільних сполук субоксидів та субнітридів. Наведено фізико-механічні характеристики цирконію після обробки в середовищах, що містять одночасно кисневу та азотну компоненти.

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“…[10] The introduction of a high amount of oxygen (≥ 8 at.%) increases solid-solution strengthening but can result in the formation of large pores and cracks. [22] As a transition metal, Zr has an incomplete shell in its electronic structure (4d 2 5s 2 ), which permits it to form solid solutions with other elements and also makes it paramagnetic. Similar to Ti, Zr can dissolve interstitial elements (O, N, C, and H) over a wide range of temperature up to a substantial level.…”

Section: Basic Properties Of Cp Zr and Its Alloysmentioning

confidence: 99%