Heat Capacity of the R2Ge2O7 (R = Pr-Lu, Y) Rare-Earth Germanates

被引：8

作者：

Denisova, L. T. ^{[1
]}

Kargin, Yu. F. ^{[2
]}

Belousova, N. V. ^{[1
]}

Irtyugo, L. A. ^{[1
]}

Denisov, V. M. ^{[1
]}

Beletskii, V. V. ^{[1
]}

机构：

[1] Siberian Fed Univ, Inst Nonferrous Met & Mat Sci, Svobodnyi Pr 79, Krasnoyarsk 660041, Russia

[2] Russian Acad Sci, Baikov Inst Met & Mat Sci, Leninskii Pr 49, Moscow 119991, Russia

来源：

INORGANIC MATERIALS | 2019年 / 55卷 / 09期

关键词：

solid-state synthesis; rare-earth germanates; differential scanning calorimetry; heat capacity; THERMODYNAMIC PROPERTIES; MAGNETIC-SUSCEPTIBILITIES; LUMINESCENCE PROPERTIES; HOLMIUM PYROGERMANATE; CRYSTAL-FIELD; TEMPERATURE; ANISOTROPY;

D O I：

10.1134/S0020168519090024

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The R2Ge2O7 (R = Pr-Lu, Y) rare-earth germanates have been prepared by solid-state reactions by firing stoichiometric R2O3 + GeO2 mixtures in air at temperatures in the range 1273-1473 K. The unit-cell parameters (a, c, and V) of the R2Ge2O7 (R = Tb-Lu) compounds have been shown to be linear functions of the ionic radius of the rare-earth elements. The high-temperature heat capacity of polycrystalline samples of the germanates has been determined by differential scanning calorimetry in the temperature range 350-1000 K. The variation in the specific heat of R2Ge2O7 has been shown to be correlated with the dependence of the heat capacity of rare-earth oxides on the ionic radius of the rare-earth element within each tetrad.

引用

页码：952 / 958

页数：7

共 42 条

[1] PHASES AND STRUCTURAL RELATIONS OF THE RARE-EARTH GERMANATES LA-LU2GE2O7
BECKER, UW
FELSCHE, J
[J]. JOURNAL OF THE LESS-COMMON METALS, 1987, 128 : 269 - 280
[2] Bogach VV, 2001, RUSS J INORG CHEM+, V46, P1011
[3] BONDAR IA, 1983, SOEDINENIYA REDKOZEM
[4] STRUCTURE AND LUMINESCENCE OF GD2GEO5 AND DY2GEO5
BRIXNER, L
CALABRESE, J
CHEN, HY
[J]. JOURNAL OF THE LESS-COMMON METALS, 1985, 110 (1-2): : 397 - 410
[5] Measurements of magnetic susceptibilities, their anisotropies and crystal field investigations of monoclinic single crystals of Ho2GeO5
Chattopadhyay, K. N.
Mondal, S.
Chakrabarti, P. K.
[J]. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2008, 320 (23) : 3288 - 3292
[6] Heat capacity and entropy of rutile (TiO2) and nepheline (NaAlSiO4)
de Ligny, D
Richet, P
Westrum, EF
Roux, J
[J]. PHYSICS AND CHEMISTRY OF MINERALS, 2002, 29 (04) : 267 - 272
[7] Dem'yanets L.N., 1980, GERMANATY REDKOZEMEL, DOI [10.1007/978-3-642-67764-9_2, DOI 10.1007/978-3-642-67764-9_2]
[8] Thermal physical properties of Bi4Ge3O12 single crystals
Denisov, V. M.
Denisova, L. T.
Irtyugo, L. A.
Biront, V. S.
[J]. PHYSICS OF THE SOLID STATE, 2010, 52 (07) : 1362 - 1365
[9] High Temperature Heat Capacity and Thermodynamic Properties of Tm2Ge2O7 and TmInGe2O7 in the Region of 350-1000 K
Denisova, L. T.
Irtyugo, L. A.
Belousova, N., V
Beletskii, V. V.
Denisov, V. M.
[J]. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A, 2019, 93 (03) : 598 - 601
[10] Specific Heat of the Er2Ge2O7-Er2Sn2O7 Solid Solutions in the Temperature Range of 350-1000 K
Denisova, L. T.
Irtyugo, L. A.
Beletskii, V. V.
Belousova, N. V.
Denisov, V. M.
[J]. PHYSICS OF THE SOLID STATE, 2019, 61 (04) : 537 - 540

← 1 2 3 4 5 →