High-temperature heat capacity of oxides of the CuO–V2O5 system

High-Temperature Heat Capacity of Zn2V2O7–Cu2V2O7 Solid Solutions

“…To attain the completeness of the solid-phase interaction of reagents, the samples were ground every 10 h and pressed into pellets once again. The control of the phase composition of synthesized samples was carried out using X-ray phase analysis similar to [7] using a PANanalytical X'Pert Pro MPD diffractometer (Netherlands) in CuK α radiation.…”

“…Interest of researchers in copper [1][2][3] and zinc [4,5] pyrovanadates has been observed for a long time. This is related to their unusual properties: near-zero coefficient of volumetric expansion [5,6] and the existence of several of their polymorphic modifications [2][3][4]7]. It can be suggested that the attention to solid solutions based on Cu 2 -x Zn x V 2 O 7 is also related to these properties.…”

“…For the Zn(VO 3 ) 2 and Zn 2 V 2 O 7 compounds, values C p (298 K) were calculated by the Matveev method [13]. There are data on the enthalpy of formation of Cu 2 V 2 O 7 and Zn 2 V 2 O 7 [13], low-temperature heat capacity of Cu 2 -x Zn x V 2 O 7 (x = 0, 0.2, 0.3, and 2.0) [12], and high-temperature heat capacity of Cu 2 V 2 O 7 [7].…”

Kinetics and Mechanism of Turanite Reduction by Hydrogen

“…Cu 5 (VO 4 ) 2 (OH) 4 (turanite) is a naturally occurring mineral consisting of alternating planes of copper(II) oxide, in the form of edge-sharing CuO 6 octahedra, and vanadium(V) oxide, in the form of VO 4 tetrahedra. Cu−V−O materials have long been studied for their polymorphic transformations 3,4 and, more recently, have attracted much attention largely due to their <2 eV band gap and associated photoelectrochemical properties. 5,6 Different forms of copper vanadate have been explored for a variety of applications, such as photocatalytic water splitting 7,8 and lithium-ion batteries.…”

“…Cu 5 (VO 4 ) 2 (OH) 4 (turanite) is a naturally occurring mineral consisting of alternating planes of copper­(II) oxide, in the form of edge-sharing CuO 6 octahedra, and vanadium­(V) oxide, in the form of VO 4 tetrahedra. Cu–V–O materials have long been studied for their polymorphic transformations , and, more recently, have attracted much attention largely due to their <2 eV band gap and associated photoelectrochemical properties. , Different forms of copper vanadate have been explored for a variety of applications, such as photocatalytic water splitting , and lithium-ion batteries. , The few studies on Cu 5 (VO 4 ) 2 (OH) 4 carried out to date have revealed its unique set of physical and chemical properties that show promise for a variety of applications. Its layered structure exhibits a unique geometrically frustrated spin–lattice, Cu 5 (VO 4 ) 2 (OH) 4 nanobelts have been demonstrated as viable anode materials for lithium-ion batteries, and, more recently, its reduced form has been explored as a catalyst for converting gaseous CO 2 to methanol.…”