Heat capacity and magnetocaloric effect in the zircon and scheelite phases of RCrO4, R = Tb, Er, Ho

Palacios Latasa, E. (Universidad de Zaragoza) ; Castro Corella, M. (Universidad de Zaragoza) ; Romero de Paz, J. ; Gallardo-Amores, J. ; Sáez-Puche, R.

Resumen: We present here new magnetization and heat capacity data under magnetic field and direct measurements of the magnetocaloric effect (MCE) in the zircon and the new scheelite phases of RCrO4 (R ¿= ¿Tb, Er, Ho) from 5 ¿K to 100 ¿K, for magnetic fields B from 0 to 9 ¿T. Zircons have a high MCE near their Curie point, TC ¿¿ ¿20 ¿K, reaching maximum isothermal entropy increments, |¿ST| ¿= ¿21, 19.4, and 16.2 ¿J ¿kg-1K-1 for HoCrO4, ErCrO4, and TbCrO4, respectively, for an external field of 5 ¿T. TbCrO4 has another anomaly near TD ¿= ¿60 ¿K associated to a Jahn-Teller transition from the tetragonal zircon structure to an orthorhombic phase. Scheelites are antiferromagnetic with TN ¿¿ ¿25 ¿K. In the Tb scheelite the rare earth is strongly coupled to Cr5+ and the MCE exhibits the typical features of an antiferromagnet, i.e. a sort of Curie-Weiss behavior above TN and a sudden drop to small or even inverse values below. In the Er and Ho scheelites the R3+-Cr5+ exchange coupling is very weak and the R3+ ion behaves independently of the Cr5+. As a striking consequence the MCE is quite stronger well below TN. © 2022

Idioma: Inglés

DOI: 10.1016/j.jssc.2022.123356

Año: 2022

Publicado en: JOURNAL OF SOLID STATE CHEMISTRY 314 (2022), 123356
ISSN: 0022-4596

Factor impacto JCR: 3.3 (2022)

Categ. JCR: CHEMISTRY, INORGANIC & NUCLEAR rank: 13 / 42 = 0.31 (2022) - Q2 - T1
Categ. JCR: CHEMISTRY, PHYSICAL rank: 88 / 161 = 0.547 (2022) - Q3 - T2

Factor impacto CITESCORE: 5.6 - Materials Science (Q2) - Chemistry (Q2) - Physics and Astronomy (Q1)

Factor impacto SCIMAGO: 0.58 - Ceramics and Composites (Q2) - Condensed Matter Physics (Q2) - Physical and Theoretical Chemistry (Q2) - Inorganic Chemistry (Q2) - Materials Chemistry (Q2) - Electronic, Optical and Magnetic Materials (Q2)

Financiación: info:eu-repo/grantAgreement/ES/DGA/E100
Financiación: info:eu-repo/grantAgreement/ES/MICINN/MAT2017-86019-R

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)
Área (Departamento): Área Cienc.Mater. Ingen.Metal. (Dpto. Ciencia Tecnol.Mater.Fl.)