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Scientific interests:

• Preparative inorganic chemistry: development of innovative methods for synthesis of inorganic salts, oxides, solid solutions and composites;
• Crystal chemistry of inorganic compounds;
• Vibrational Spectroscopy (infrared and Raman spectroscopy): interpretation of vibrational spectra; factor group analysis; matrix spectroscopy; bonding interactions in solid state;
• Synthesis, structure, spectroscopic and morphological characterization of polyanion intercalation materials as electrodes for lithium-ion and post lithium-ion batteries;
• Thermal analysis.

Selected papers:

1. V. Koleva, T. Boyadzieva, R. Stoyanova,
   “Crystal and Morphology Design of Dittmarite-Type Ammonium Iron–Manganese Phosphates, NH₄Mn_1–xFe_xPO₄·H₂O, as Precursors for Phospho-olivine Electrodes“,
   Crystal Growth and Design 19 (2019) 3744-3754.
2. R. Stoyanova, V. Koleva, A. Stoyanova,
   “Lithium versus Mono/Polyvalent Ion Intercalation: Hybrid Metal Ion Systems for Energy Storage”,
   The Chemical Record 19 (2019) 474-501.
3. L. Mihaylov, T. Boyadzhieva, R. Tomov, V. Kumar, V. Koleva, R. Stoyanova, T. Spassov,
   “LiMnPO₄-olivine deposited on a nanoporous alloy as an additive-free electrode for lithium ion batteries”,
   Dalton Transactions 48 (2019) 17037-17044.
4. T. Boyadzieva, V. Koleva, R. Stoyanova,
   “Crystal chemistry of Mg substitution in NaMnPO₄ olivine: concentration limit and cation distribution”,
   Physical Chemistry Chemical Physics 19 (2017) 12730-12739.
5. T. Boyadzhieva, V. Koleva, E. Zhecheva, D. Nihtianova, L. Mihaylov, R. Stoyanova,
   “Competitive Lithium and Sodium Intercalation into Sodium Manganese Phospho-Olivine NaMnPO₄ Covered with Carbon Black”,
   RSC Advances 5 (2015) 87694-87705.