Bi Fe O 3 and Bi1−xGdxFeO3 (BGFO) (x=0.03, 0.05, 0.07, 0.10, and 0.15) thin films were deposited on Pt∕Ti∕SiO2∕Si substrates using a metal organic decomposition process. X-ray diffraction results show that a gradual phase transition from rhombohedral to pseudotetragonal structure may occur in BGFO films with the increase of Gd content. Due to the lower leakage currents resulting from the smaller grain sizes and smoother surfaces, well saturated P-E hysteresis loops, which show weak dependence of frequency in the range of 3–50kHz, can be observed in all BGFO films at room temperature. The remanent polarization for BGFOx=0.03 film is about 79μC∕cm2. In addition, no evident fatigue can be observed after 109 switching cycles.

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Phytophthora root rot caused by Phytophthora capsici (P. capsici) is a serious limitation to pepper production in Southern China, with high temperature and humidity. Mapping PRR resistance genes can provide linked DNA markers for breeding PRR resistant varieties by molecular marker-assisted selection (MAS). Two BC1 populations and an F2 population derived from a cross between P. capsici-resistant accession, Criollo de Morelos 334 (CM334) and P. capsici-susceptible accession, New Mexico Capsicum Accession 10399 (NMCA10399) were used to investigate the genetic characteristics of PRR resistance. PRR resistance to isolate Byl4 (race 3) was controlled by a single dominant gene, PhR10, that was mapped to an interval of 16.39Mb at the end of the long arm of chromosome 10. Integration of bulked segregant analysis (BSA) and Specific Length Amplified Fragment sequencing (SLAF-seq) provided an efficient genetic mapping strategy. Ten polymorphic Simple Sequence Repeat (SSR) markers were found within this region and used to screen the genotypes of 636 BC1 plants, delimiting PhR10 to a 2.57 Mb interval between markers P52-11-21 (1.5 cM away) and P52-11-41 (1.1 cM). A total of 163 genes were annotated within this region and 31 were predicted to be associated with disease resistance. PhR10 is a novel race specific gene for PRR, and this paper describes linked SSR markers suitable for marker-assisted selection of PRR resistant varieties, also laying a foundation for cloning the resistance gene.

Fe 3 O 4 /α-F e2 O 3 composites were synthesized by a one-step method. The composition and their performances were modified by adjusting the concentration of Fe 3+ (FeCl 3 •6H 2 O) in the precursor solution, effectively. Compared with single-phase Fe 3 O 4 and Fe 2 O 3 , the effective microwave absorbing ability of Fe 3 O 4 /α-Fe 2 O 3 composites is much widened in the range 1−18 GHz, which could stem from the enhanced dipolar polarization and interfacial polarization due to lattice dislocations at the interface of Fe 3 O 4 /α-Fe 2 O 3 . The minimum reflection loss (RL) of Fe 3 O 4 /α-Fe 2 O 3 composites reaches about −43.1 dB at a thickness of 2.0 mm, with the effective absorption band reaching 3.4 GHz (9.8−13.2 GHz). In the thickness of 1.5−3.2 mm, the width of the RL reaches 9.9 GHz (3.5−13.4 GHz). The results demonstrate that Fe 3 O 4 /α-Fe 2 O 3 composites could be a candidate to be used as absorbers with the microwave absorption band much widened.