Phase formation in the La2(WO4)3–In2(WO4)3 system and properties of a new double tungstate LaIn(WO4)3

Phase formation in the La2(WO4)3–In2(WO4)3 system and properties of a new double tungstate LaIn(WO4)3 Full article

Journal

Solid State Sciences
ISSN: 1873-3085 , E-ISSN: 1293-2558

Output data

Year: 2026, Volume: 173, Article number : 108203, Pages count : 7 DOI: 10.1016/j.solidstatesciences.2025.108203

Tags

Phase formation, Double tungstate, Crystal structure, Thermal expansion, Electrical conductivity

Authors

Ayusheev Bator ¹ , Spiridonova Tatyana ¹ , Solodovnikov Sergey ² , Solodovnikova Zoya ² , Yudin Vasiliy ² , Khaikina Elena ¹

Affiliations

1	Laboratory of Oxide Systems, Baikal Institute of Nature Management, SB RAS, Ulan-Ude, 670047, Russia
2	Laboratory of Crystal Chemistry, Nikolaev Institute of Inorganic Chemistry, SB RAS, Novosibirsk, 630090, Russia

The La2(WO4)3–In2(WO4)3 system was investigated by X-ray diffraction (XRD) and differential scanning calorimetry (DSC), and its phase diagram was constructed. A new double tungstate LaIn(WO4)3 was identified and shown to melt incongruently at 1100 °C. The crystal structure of this compound was determined by single-crystal XRD (space group P-1, a = 7.5938(5) Å, b = 7.6397(5) Å, c = 16.8929(10) Å, α = 101.453(2)°, β = 96.398(2)°, γ = 98.323(2)°, RF = 0.059). The structure consists of alternating blocks of wolframite-like In2W4O15 and scheelite-like La2W2O9. Investigation of thermal behavior by high-temperature XRD (HTXRD) revealed that this phase exhibits low thermal expansion. The electrical conductivity of LaIn(WO4)3, studied by impedance spectroscopy, was σ = 9.3 × 10−8 S/cm (Ea = 0.7 eV) at 200 °C and 1.7 × 10−5 S/cm (Ea = 1.4 eV) at 800 °C. Bond-valence site energy (BVSE) calculations demonstrated the possibility of three-dimensional oxygen transport in the studied compound.

Ayusheev B. , Spiridonova T. , Solodovnikov S. , Solodovnikova Z. , Yudin V. , Khaikina E.
Phase formation in the La2(WO4)3–In2(WO4)3 system and properties of a new double tungstate LaIn(WO4)3
Solid State Sciences. 2026. V.173. 108203 :1-7. DOI: 10.1016/j.solidstatesciences.2025.108203 WOS Scopus

Submitted:	Oct 24, 2025
Accepted:	Dec 27, 2025
Published online:	Dec 28, 2025
Published print:	Mar 2, 2026

Web of science:	WOS:001659166700002
Scopus:	2-s2.0-105026175912

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