Synthesis and Characterisation of Magnetic and Semiconducting Ceramics

Code

J2-7603 (D) - included in ARIS records

Head

PhD Mihael Drofenik

Period

1/1/1996 - 6/30/2001

Science

Natural sciences and mathematics (1)
Engineering sciences and technologies (6)
Other (1)

Reseacher status

Researcher (8)
Junior expert or technical associate (0)

Education

Doctor's degree (6)
Other (2)

Sex

Woman (1)
Man (7)

Status

Employed at RO and RRD (3)
No data on employment in RO (1)
Retired (1)
Deceased (3)

No. of publications

1–9 (1)
10–99 (2)
100–999 (4)
1,000–9,999 (1)

Projects / Programmes source: ARIS

source: ARIS

Synthesis and Characterisation of Magnetic and Semiconducting Ceramics

Research activity

Code	Science	Field	Subfield
2.04.00	Engineering sciences and technologies	Materials science and technology

Code	Science	Field
T153	Technological sciences	Ceramic materials and powders
P360	Natural sciences and mathematics	Inorganic chemistry

Keywords

ceramics, magnetic materials, MnZn-ferrites, semiconducting ceramics, barium titanate, PTCR effect, microstructure, sintering, magnetic permeability, conductivity

Evaluation (rules)

source: COBISS

Evaluation of bibliographic research performance indicators according to ARIS methodology

Citations Citations for bibliographic records in COBIB.SI that are linked to records in citation databases

source: WoS

source: Scopus

source: COBISS

Researchers (8)

no.	Code	Name and surname	Research area	Role	Period	No. of publicationsNo. of publications
1.	02556	PhD Goran Dražić	Materials science and technology	Researcher	1996 - 2001	1,053
2.	01360	PhD Mihael Drofenik	Chemistry	Head	2000 - 2001	770
3.	05217	Irena Jenko		Researcher	1996 - 2001	3
4.	01849	PhD Miloš Komac	Materials science and technology	Researcher	2000 - 2001	140
5.	10372	PhD Darko Makovec	Materials science and technology	Researcher	1999 - 2001	671
6.	06062	Josip Puh	Materials science and technology	Researcher	2000 - 2001	14
7.	07992	PhD Igor Zajc	Materials science and technology	Researcher	1998 - 2001	71
8.	10019	PhD Andrej Žnidaršič	Electronic components and technologies	Researcher	2000 - 2001	206

Organisations (1)

no.	Code	Research organisation	City	Registration number	No. of publicationsNo. of publications
1.	0106	Jožef Stefan Institute	Ljubljana	5051606000	91,653

Abstract

As a part of the research project the Hydrothermal Synthesis of MnZn ferite powder was performed with the use of an autoclave. A new autoclave was designed and manufactured, which makes possible the synthesis of ferrite powders above the supercritical point of water. Assessments the phase composition, morphology and the sinterability of the hydrothermally prepared powder were performed. An investigation of the characteristics of thermistors based on highly donor doped BaTiO3 revealed that by applying a low enough partial pressure of oxygen during sintering, followed by reoxidation, the PTCR anomaly can also be induced in these samples. Sintering of MnZn ferrites doped with Bi2O3 enables an increase in the permeability of MnZn ferrites by about 20%. This investigation elucidates the most probable mechanism, which governs the increase in magnetic permeability during sintering and microstructure developement of MnZn-ferrites studied. In addition, the semiconducting composition based on the binary systems Nd2O3-ZnO and Sm2O3-ZnO were studied. In both composite samples the PTCR effect was identified, the origin of which can be related to the percolation effect peviously identified in the recently studied model system, NiO-ZnO.