Magnetic behaviour of bimetallic layered phases M′_0.2Mn_0.8PS₃·0.25 H₂O (M′ = Zn^II, Cu^II, Ni^II, Co^II)

Abstract

In this work the magnetic properties of bimetallic phases M'MnPS·0.25HO (M' = Co, Ni, Cu or Zn) have been explored and compared with those of the pristine phase MnPS. Magnetic susceptibility, high field magnetization and electron paramagnetic resonance (EPR) studies reveal that the transition temperature between the antiferromagnetic and paramagnetic order for the pristine phase is shifted to lower values in the bimetallic phases. From magnetization measurements the critical field of the spin-flop transition is found to be dependent on the nature of the added secondary transition metal ion. EPR spectra of all compounds in the temperature range of 8-300 K present a single resonance line shape. Temperature dependence of the EPR parameters, like line width, g values and double integrated area (I), are obtained from the spectra and present a scenario compatible with the magnetization results. The temperature dependence of the first derivative of the product (IT) shows two maxima for all samples, with exception of the Co phase, indicating two critical temperatures, while these critical temperatures could not be clearly determined by dc susceptibility.

Physical properties of new ordered bimetallic phases M0.25Cd0.75PS3 (M = ZnII, NiII, CoII, MnII)

“…S1). This phenomenon was also observed in a precious study of the K0.4Mn0.8PS3 phase, whose vacancies can be filled by Ni II , Co II , Cu II and Zn II ions 29,30 . Powder X-ray diffractograms of the bimetallic phases were recorded in order to analyze the crystalline structure of the obtained bimetallic phases.…”

“…A possible explanation must be related to the sample preparation method. In the samples obtained by the ceramic process the 3d cations are distributed randomly 28 , while the intercalation and cationic exchange reaction should lead to an organized distribution of transition ions according to the vacancies, created by the first reaction 29,30 . Schmedt auf der Günne et al proposed a model for the vacancies present in the K0.5Cd0.75PS3 phase, which has been proved to be the same as in our materials 35 .…”

“…Due to the great relevance of these materials, based on their potential applications 6 , it is important to have a more controlled synthetic procedure to avoid this random distribution in order to obtain an ordered material. In our group, we have been working with a two-step methodology, using the intercalation reaction, to achieve ordered bimetallic phases 29,30 . In the present work the characterization of four new ordered bimetallic phases, derived from CdPS3, together with their magnetic, conducting and optical properties are reported.…”

Manganese(ii) thiophosphate (MnPS3) intercalates with lanthanide (PrIII and NdIII) complexes: optical and magnetic properties

“…2,17 A well known intermediate to do further intercalation reactions is the potassium precursor (PP) K 0.4 Mn 0.8 PS 3 ÁH 2 O, which is obtained by simply immersing the pristine phase in a 2 M KCl solution for 24 hours. [18][19][20][21][22] This intercalated phase can then be used as a precursor for the partial ion exchange of the interlayer potassium ions by more voluminous guests, such as coordination compounds. 23 All these reactions give rise to intercalation compounds with different optical, electrical, and magnetic properties.…”

Estudos de ressonância paramagnética eletrônica em vidros e nanocompósitos

“…Ainda, para os compósitos K[Zn 2 L]MnPS 3 e K[Cu 2 L]MnPS 3 , o colapso das linhas ocorre a partir de 30 K. Isto pode ser devido ao fato de que a curva de magnetização destes compósitos é muito alargada. Magnetic behaviour of bimetallic layered phases M' 0.2 Mn 0.8 PS 3 •0.25 H 2O (M'= Zn(II), Cu(II), Ni(II), Co(II))Comportamento da largura de linha e do fator-g das amostras analisadas (esquerda) e derivada do produto I DIN xT com respeito a temperatura (direita).Fonte: FUENTEALBA et.al (102)…”